Optimizing ignition timing for gasoline engines. The Gray wire is responsible for activating the retard. The faster the engine turns the less start retard it. Fuel is not timed. Retarding the crystallization of PbI 2 for highly reproducible planar-structured perovskite solar cells via sequential deposition† Yongzhen Wu , a Ashraful Islam , a Xudong Yang ,* a Chuanjiang Qin , a Jian Liu , a Kun Zhang , a Wenqin Peng a and Liyuan Han * ab. Related HowStuffWorks Articles. when you get to a point of the highest vacuum reading, stop advancing the timing and start to retard the timing until you see a reduction of 2 inches of vacuum from your highest point. Use retard with extreme caution and care. This changes the power curve of the engine by reducing the mid range “hit” and allowing the engine to over rev some. CAUTION: You must recheck your piston to valve clearance after advancing or retarding you camshaft timing. 84 169mph There is probably a significant AF ratio factor in this as well. Spark timing retarded to far will cause late combustion, losing the opportunity to take advantage of the most efficient part of the power stroke, at the top where the highest pressures occur. When I first started the test vehicle the timing was retarded (about 6 degrees ATDC). Best power is achieved when ignition timing is set to fire the spark ahead of time to reach that peak pressure at about 2 degrees after TDC. listen close for pinging in the roll on 1/4-1/2 throttle position in the 2250 -3000 range. Let's use a single cylinder in an engine as an illustration to demonstrate Ignition Timing. i had the ignition retarded by 3 degrees to handle n20 on the 3sge, its a very safe option but benefits from a rolling tune. The retard is used to counter the effect of increased flame travel speed with increased engine heat. Ignition timing is quite simple and the benefits to be gained are great namely more power, longer engine life and better gas mileage. All automotive engines today have four strokes. "But you don't want to go past between 5 and 0*," he noted. 1) Those vehicles originally equipped with breakerless ignition systems or dual point ignition systems where one of the points is used to retard timing for emission control. The overall cam timing can be characterized using four opening and closing parameters. Normally aspirated Drag Race engines have been built with high RPM spark retard. Integrated ignition timing control; Programmable launch control via 2-step and timing retard. Retarding overall cam timing: Retarding overall cam timing is better for high-RPM power. The control knob mounts to the dash board for easy and accurate timing adjustments up to 15 Degree. For blown or nitroused applications I always recommend an MSD ignition amplifier box setup. Timing Control: Ignition timing of the IC-920 family can be biased (advanced or retarded) in real time based on a potentiometer setting, a 4–20 mA or 0–5 Vdc signal, or a 5-point speed map. People retard engine timing to compensate for poor air/fuel harmonization and/or increased cylinder temps from SC/TC/N2O. Gasoline compression ignition approach to efficient, clean and affordable future engines. Reasons a Late Model Vehicle. Retarding the timing of either cam reduces the massflow through that port – Retarding the flow cam increases massflow through the swirl port and vice versa A large variation possible: Minimum – maximum flow varies by a factor of 3 Total massflow is relatively constant, with a variation of 10% over the map range. 2) Ignition timing too far advanced – as spark is retarded NOx will drop, so perhaps our timing put the ignition event too early before the power stroke. This will help prevent damage to the engine as it goes through the pre-ignition process. As I understand it, pinging typically occurs because the fuel preignites in the cylinder, due to high pressures and heat in the combustion chamber. It doesn't miss until the engine warms up. Retarding the timing will make the power band smoother in the mid-range and give more top end over rev. It should start fairly easily. The compressed gas needs some time to ignite. The control knob mounts to the dash board for easy and accurate tim­ing adjustments up to 15°. could be achieved by leaving the mixture at the leaner optimum and retarding the ignition more instead. CNG cylinder is at the pressure of 130 Bar. One major benefit of electronic ignition is that its non-contact within the distributor. The control knob mounts to the dash board for easy and accurate timing adjustments up to 15°. However in order to realize these benefits a num ber of issues face by. We use a timing belt on our engines and know the belt will stretch at high rpm, retarding the cam and therefore the ignition, so we check the timing at a relatively high rpm, such as 5,500 rpm. #1 Is a timing indicator, you'll see a definite color change on the ground strap, it doesn't show well here but you can still see it right about at the arrow. the benefits of direct injection in turbocharged engines, ethanol's knock suppression properties, and the effects of ethanol concentration in gasoline/ethanol blends. This degradation can cause a narrowing point gap, retarded timing, increased dwell, and, eventually, a very poor-quality spark. The spark ignites the air and fuel mixture. Depending on if you're running Turbo, nitrous, or all motor, cam timing can see HUGE gains. We will assume these events are measured at 0. The early injection timing 20° bTDc and 16° bTDC shows higher peak heat release rate a compared to base case of 12°. basically, by having the cam timing advanced, you're gaining low end power (kind of the oposite of ignition timing) and mid range power, retarding timing will have the reverse effect - of course this system is 10x more complicated when dealing with two cams which allow for seperate cam adjustments (the one and ONLY benifit to DOHC engines) this allows for vavle overlap and such. The cam can be advanced or retarded from the card specs up to 6 degrees. 5 it seems to run better At idle it used to be 13. Recommended Posts. This allows more energy from the fuel burn to reach the turbo compared to an application where the spark timing is not retarded,” Galvan explained. Carter—CER, Echlin, STP—Air Computer and AQP—Electro—NOx and Kar Kit). For the benefit of hand starting, this means that if the engine misfires, it will rotate forwards, and not risk injuring the starter. The control knob mounts to the dash board for easy and accurate timing adjustments up to 15?. ****SPECIAL NOTE FOR MSD DISTRIBUTORS**** The purple wire DOES NORMALLY change position between the harness and distributor—but a final check of correct polarity is done by checking rotor phase and should. (If you would leave your turbo and ignition timing at the edge and your VE get with a cam timing change higher, the engine will start to knock and the turbo will fall out of his efficiency rage. on my All motor CRX, I was able to wring 20 HP out of the 1. Since they are related in time, understanding ignition is the first step toward determining the necessarily correct optimized injection timing. Aprilia and BMW both close the electronic throttle (fine modulation, wide range of authority, slow response) and also retard the ignition timing. Timing Control: Ignition timing of the IC-920 family can be biased (advanced or retarded) in real time based on a potentiometer setting, a 4–20 mA or 0–5 Vdc signal, or a 5-point speed map. If the measured ignition event was before top-dead-center (or to the left), then the ignition timing would be about 8º-9º advanced. The benefits of sophisticated injection timing control to the Toyota performance enthusiast however are significant - not only for improved engine performance, but more importantly for efficient engine operation (improve fuel economy) and engine durability (lowering peak combustion temperatures). If it happens at low RPM and heavy engine load and it does not happen during cold runs, chances are your ECU is not reading the changing load condition in time to retard ignition timing. The results show that the hydrogen addition can retard the auto-ignition timing of DME in HCCI combustion engine. The power difference between detonation and 3-4 degrees of retarded timing from this point is negligible, so riding the ragged edge of timing is not worth the risk!. See also Fig. Both devices electronically control the spark timing so as to provide five degrees (Model 48) and three degrees (Model 48C) retard below centrifugal advance (dependent upon distributor centrifugal advance. But if you don't have any pinking under heavy load at say 3000 rpm, you have probably got the timing about right as it is. Related HowStuffWorks Articles. total timing. Retarded timing can be defined as changing the timing so that fuel ignition happens later than the manufacturer's specified time. As we all know, severely retarded ignition timing will result in significant power loss, increased water and oil temps, and high exhaust gas temps. However, if the timing is advanced too far, it will cause an Engine Knock. Therefore the ignition advance needs to be increased to bring the point of peak combustion to just beyond TDC. timing As said go back to single spark mode. The same result (with more power, less emissions and less fuel consumption) could be achieved by leaving the mixture at the leaner optimum and retarding the ignition more instead. Advancing the timing typically gives more bottom end and gives a bit more hit in the mid range and you lose some top end. The distributor may need adjusting to prevent crossfire. The max allowed spark advance is configurable in the sense that you can limit how far the car can advance timing at a given load and rpm (see. Ignition timing on almost all modern vehicles is based on the crankshaft position sensor’s input to the PCM. I checked it recently with a timing strobe light and the two marks appears to be about 10-12mm out of alignment when engine idling. For nitrous oxide applications the timing retard can be activated using the dedicated timing retard activation input to the LNC-2000. Starting is also easier with less advance while cranking than at idle. Integrated ignition timing control; Programmable launch control via 2-step and timing retard. Aircraft - Fuel - General Engines Question Nitro/Timing/YS Questions Engines Question Nitro/Timing/YS Questions. See also Fig. The Porsche Technical Specifications booklet tells me I should be at 2 degrees + or - 2 BTDC at 900+or- 50 rpm with vacuum connected So I warmed up the engine then connected up the strobe. So, if I retard my timing to say 28 degrees (so that my blown 454 can crank a lot easier and put less pressure on the starter) and then add an 8680 timing control with knob adjustment set in the center , at that 29. Hi guys, this is a new one, for me, but from what I understand, this car came in for an engine knock. Engine Timing Ignition Timing Explained/Timing an Unknown Engine. A genuine 180 watt 12VDC system. Ignition timing consists chiefly of three parts: initial timing, timing advance or curve, and total timing. 1971 Yamah AT1 125cc piston port motor with battery powered points ignition. It is also known as vacuum advance, distributor advance, distributor spark control, automatic spark advance, distributor vacuum advance, and advance timing mechanism. points is used for emission control. The highest point the piston can go is called top dead center, or TDC. Effects of Retarded Timing. Restart the engine, and give it 12-15 degrees of advance at idle, and go for a spin. At idle the desired injection pump timing reads 8. Honda stators have a sheet metal plate riveted to one of the mount holes. I have always heard that one way to reduce pinging is to retard ignition timing, but I don’t understand why that is. Many different conditions and situations can cause low blood pressure, from standing up too fast to being pregnant. A 'retarded' timing injects the fuel slightly behind of the factory designed injection timing. Features & Benefits. total timing. to take advantage of the higher octane benefits LPG fuel, which. But, some time and effort will be required. This will get you close. Spark Plug Basics. Mallory FireStorm coils are optimized to work with our ignition boxes to deliver reliable 150 mJ of spark energy to your plugs. Leveraging the benefits of ethanol in advanced engine-fuel systems. The intake valve is closing AFTER the piston has started to travel back up the bore for the start of compression stroke. Re: How does timing retard increase top-end? 05-02-05 03:39 AM - Post# 685231 In response to Chevytu Easy way to find out if your combo needs a High RPM, High gear retard is to run it at the track. The cool thing about ignition timing is you can usually get a considerable performance increase for little or no money. Dwell angle is automatically handled by electronic ignition systems. as above( Carb type only) Or fit our unique new retard by advance system (Electronic ignition types only) We have just released this devise that replaces. Ignition System Quiz. Retarding the timing of either cam reduces the massflow through that port – Retarding the flow cam increases massflow through the swirl port and vice versa A large variation possible: Minimum – maximum flow varies by a factor of 3 Total massflow is relatively constant, with a variation of 10% over the map range. With careful timing, correct protocols, and shrewd management of the loading sequence, an athlete can receive the recovery benefits without losing the gains they need from their conditioning and strength sessions. FEATURES AND BENEFITS Optimum Performance - The DSM will advance timing to the nameplate timing value as engine conditions allow. A handy device to have is an ignition system with a "boost retard control," such as the Holley Ignition P/N 800-450. #1 Is a timing indicator, you'll see a definite color change on the ground strap, it doesn't show well here but you can still see it right about at the arrow. Is that correct? Also, advancing the timing from 15 deg. The first is ignition timing that is, the amount of spark lead that is set using a timing light (aimed at the harmonic balancer with the engine at idle). Retarding overall cam timing: Retarding overall cam timing is better for high-RPM power. Tuned and modified engines have different. When the crank reaches the timing point an electric current is fired off to the spark plug. The usual ignition timing light is a sort of mains powered flash tube, triggered by the spark on plug 1. to take advantage of the higher octane benefits LPG fuel, which. First of all the car must be fully warmed up. The way this engine is tuned is that an advanced camshaft is best for high torque, high power situations and a retarded camshaft is best for low torque, low emission, cruising situations. The changes we make during tuning considerably affect combustion and this calls for an adjustment in ignition timing. (retarding spark timing from its optimum value), and these applications also had VERY low initial static timing (usually 4 degrees or less, and some actually were set at 2 degrees AFTER TDC). The ignition timing at low temperature is retarded slightly with the hydrogen addition, and the ignition timing at high temperature is delayed significantly due to the increased negative temperature coefficient duration. At idle the desired injection pump timing reads 8. Now, when you retard the ignition in two stroke engines, the ignition occurs closer to the moment when the exhaust "valve" opens. When the engine is idling, the spark is retarded significantly, to smoothout the engine. 050 for just a smidge more HP. On the dyno or at the track, this micro adjuster for setting the timing is a boon. does it differently. This protects the engine when the driver goes to full throttle after the TMIC has heat soaked. Retarding the timing can help reduce Detonation. Once you have reset the timing limiter, reinstall the clip that holds the point cam on the shaft, the advance weights, springs, and breaker plate. As you increase the throttle, the module senses this anddecreases the amount of retard. by: Michael Shiffer. Hi there I am about to fit one of the Classic Retro CDI units so first step is to check the ignition timing. You can't advance the timing or you will swing early or knock so you retard the timing to make maximum power, known as mean best timing. The control knob mounts to the dash board for easy and accurate timing adjustments up to 15 Degree. com for free. From Jim C. For reduced exhaust emissions, the timing at idle is retarded by several degress, lowering HC and Nox levels. Well the ignition pinging is very distinctive and I don't think the mechanics were that incompetent to make a mistake on that. With the use of this unit, you can run normal timing settings which will allow for easy starting and reasonable fuel economy under normal driving situations. The only positive of using the electronic ignition is variable timing. 89 166mph Timing 38 at launch and retarded to 31 at 5 seconds out= 4. Just use the flywheel marks against you TDC mark - nice. For this reason, high-performance diesel automobile proponents, such as Gale Banks, believe that. Changing your ignition timing can have far-reaching effects, so it's important to understand the process. This is done with a combination of initial advance, plus centrifugal or electronic controlled advance for engine speed, plus vacuum or electronic advance for engine loading and throttle effect. Ignition Timing for Modified Engines An often neglected but important area when tuning an engine is the ignition system. could be achieved by leaving the mixture at the leaner optimum and retarding the ignition more instead. mtr) PV Diagram Peak Pressure obtained Degreeis 0 10 20 30 40 50 60 70 80 680 730 780) Crank Angle(Degree). Re: How does timing retard increase top-end? 05-02-05 03:39 AM - Post# 685231 In response to Chevytu Easy way to find out if your combo needs a High RPM, High gear retard is to run it at the track. The ICM can store two separate timing maps which are set up using GAC’s SmartVU software. Reduction of the timing advancement to the correct amount keeps the engine from fighting against excess cylinder pressure. This will hurt performance and economy. But for now, the Ignition Timing Connector is disconnected. Advertisement. Lock down the dist. 020 for setting the cam timing. Retarding the ignition timing means that the spark has less time to become energised Before Top Dead Centre (BTDC), and so the force with which the piston comes back down after it has reached TDC. octane booster is going to cost you everytime you fill up, retarding the ignition timing is a pretty much end of problem fix. Aprilia and BMW both close the electronic throttle (fine modulation, wide range of authority, slow response) and also retard the ignition timing. Figure 1 The Timing Computer's Ignition Curve. , but doing so hurts low speed torque which is not recommended for street engines or cars with automatics. At least not with the normal timing lights most of us use. Make sure your idle RPM is above the start retard setting in order to set your timing correctly. We will discuss the importance of seat-to-seat timing below under Opening Rate. Blown5402, the Mallory mag as do all mags retard the ignition when under a load. When activated, the timing is retarded 25°. Basic Ignition Timing Vehicle Retarded 5 degrees Standard Advanced 5 degrees A 88 91 93 B 86 90. Benefits of retarding ignition timing. Benefits include the elimination of distributor cap and rotor wear, reduced spark energy losses caused by long spark plug wires, and the ability to optimize your ignition tuning parameters. The next step is to use a timing light connected to the coil or ignition lead on #1 cylinder and view the actual ignition timing the engine is seeing. hand advancing the ignition timing causes rise in NO formation due to increase in pressure and temperature during the combustion process. Honda stators have a sheet metal plate riveted to one of the mount holes. Starting is also easier with less advance while cranking than at idle. Fit Sportster models from 1971 thru 1979 and Big Twins from 1970 thru 1979. The FAST® E7 Programmable Ignition is ideal for any street, drag or circle track application where reliable, powerful ignition is required. The last job for the day is to retard the ignition timing. The Control can be used on 4, 6 and 8-cylinder engines and must be used with an MSD Ignition Control. I too use start retard, does what I want it to, and looks like this in programming. Recommended Posts. The air/fuel mixture doesn’t have enough time to fully ignite which results in. The need for advancing (or retarding) the timing of the spark is because fuel does not. There are two primary factors which govern the ignition advance. However, if the timing is advanced too far, it will cause an Engine Knock. Timing is frequently set incorrectly on these motors. Set up in cruise, let things stabilize for a couple minutes, and then turn off the electronic ignition. The time that the fuel takes to burn is roughly constant. But does the 93-95 E320 M104 engine have retarding also? (why wouldn't it I ask?) If it does how. "But you don't want to go past between 5 and 0*," he noted. If it doesn’t, you will have to adjust the timing by moving the pickup plate mounted inside the points cover, up and to the right of the timing mark inspection hole. org In a spark ignition internal combustion engine, Ignition timing refers to the timing, relative to the current piston position and crankshaft angle, of the release of a spark in the combustion chamber near the end of the compression stroke. If it is dragging so bad you can't even start it, retard the timing a little bit and try to start it. Now in my 60’s I drive a little different but am more amazed at the smoothness and even running that can be dialed in. The spark is. Leveraging the benefits of ethanol in advanced engine-fuel systems. Knock occurs more frequently when using low octane fuel. - retard the tune to a quite safe state, get sure that your tune is a few degree back from the knock treshould and the turbo doesn't run at the edge. The ignition correction logic is a real time function of keeping track of spark advance and spark retard offset of the final ignition timing. Also if using a strobe to set the timing at idle, the original distributors will already be advancing as minimum rpm is in the 200 order (400 engine) so below idle speed so if you set to book speed at idle (10 degrees) you will actually be setting about 1 to 2 degrees retarded from the static setting. The only adjustment is to set the points gap. Retarded injection timing, late injection. Know how to adjust your timing, have your timing marks clean and the distributor clamp loosened ahead of time so you can advance the timing to 8 degrees BTDC (Before Top Dead Center) quickly. It says that the rod to crank angle will be better, making more power. This is known as "degreeing the camshaft. Your new stator plate and flywheel should have a special coil that is the ignition timing coil. How To Check For Correct TDC (heads on the engine): There are two methods that work well to check for correct TDC with the heads still on the engine. Retard Timing – When the spark occurs later in the compression stroke. My question is that when I rotate the distributor and the mark on the harmonic balancer moves toward advanced side and the idle slows down, rotating the opposite or retarded, the idle speed increases. 5L Automatic and Manual transmission is complete! (Pending Release) EVERYTHING IS PROUDLY TESTED ON OUR VERY OWN 2017 TRD PRO. CAUTION: You must recheck your piston to valve clearance after advancing or retarding you camshaft timing. Digital timing with auto advance and retard. Further, if your existing ignition is working well, I would suggest that there is nothing that you will add by switching to Sniper EFI-controlled ignition timing that could possibly be worth the nightmare you are about to experience. Timing is frequently set incorrectly on these motors. When combustion occurs it does not take place instantly. This will help prevent damage to the engine as it goes through the pre-ignition process. The time while a current will charge the coil with magnetic energy - the dwell, and the moment when the spark should fire inside the cylinder - the timing. Hence, several cases were calculated with different engine compression ratios and different amount of injected water, varying in a range of 0–100% of the fuel mass. Retarding is like swinging to late. Integrated ignition timing control; Programmable launch control via 2-step and timing retard. Key words: ethanol, ignition timing advance, emissions. Advanced timing gives a better low end, middle, and high end retarded timing = worse emissions (high HC content, i think). The main downside is that your car will be slower until the ignition timing returns to normal. A cool bath—not icy or cold—is enough to feel soothing and refreshing without blunting the signal pathways. Ignition Tuning 201 How To Use an Air/Fuel Meter to Optimize Your Ignition Timing Curve as published in British V8 Newsletter, Volume XV Issue 1, April 2007 by: Jeff Schlemmer, proprietor of Advanced Distributors, LLC When it comes to selecting an ignition system, most people are left with more questions than answers. Increased fuel mileage and performance are just some of the benefits as the ignition timing can be advanced or retarded to prevent engine detonation. cam timing Advancing the cam timing increases low end torque. Again, this is a very minor change, and doesn't affect things THAT much. timing As said go back to single spark mode. This means that the faster the engine goes, the earlier the spark has to occur. need input on a bypass wiring 55 watt back-up lamps where should my relay be msd ignition for supercharged engines car running a bit hot also i want to know about relays and fuses found in the. 89 166mph Timing 38 at launch and retarded to 31 at 5 seconds out= 4. The Timing Computer also has two optional features. 050 for just a smidge more HP. So today I rolled into my smog shop to get my registration renewed, and I passed with flying colors minus the Functional test, where I failed for ignition timing, which was at 8 degrees, instead of 10. Timing can be retarded multiple ways on almost all vehicles- through a tune or timing retard box, or by changing your ignition settings on your ignition control box. A setting that gives a good HP reading on a 5 second Dyno run is usually too advanced for continuous load applications. degree bTDC and retarding the timing of injection ( 23 to 29 degrees) because of the mechanical pump retarding is only possible, the diesel injection is act as a strong ignition source for the CNG air mixture. — or electronic ignition systems. Checking and adjusting these elements of timing for maximum power and efficiency are. A genuine 180 watt 12VDC system. I checked it recently with a timing strobe light and the two marks appears to be about 10-12mm out of alignment when engine idling. Most aftermarket cam sprockets run a 3 keyed upper gear to advance/retard. Diesel injection timing must be timed in response to the factors affecting ignition quality and timing. We will assume these events are measured at 0. Hi Toyota [] T100 will not accelerate when the timing is set to 10 [] checking with a timing light and watching the scanner,I realized the timing is retarding about 15 or 20 degrees on throttle [] G1,G2,and NE coils resistance in the dist. The 77 is a good setup, it has adjustable vacuum advance, a better ignitor than 74-76, and an emergency backup ignition system in the form of ignition points and a condenser. Retarding of the timing is just a way of preventing detonation if it's occuring. fgutie35 - in regards to fuel quality it does not affect ignition timing but a lower quality fuel does not support combustion the same way as a higher octane rated fuel or fresh fuel does - also the age of the fuel does definitely change the quality of that fuel - a common explanation is that the higher 'ends' of the carbon chain (fuel chemistry- these higher ends are what support combustion. 7* per every 50 horsepower of nitrous. Just use the flywheel marks against you TDC mark - nice. Hi guys, this is a new one, for me, but from what I understand, this car came in for an engine knock. This changes the power curve of the engine by reducing the mid range “hit” and allowing the engine to over rev some. Ignition Retard. The only adjustment is to set the points gap. The power difference between detonation and 3-4 degrees of retarded timing from this point is negligible, so riding the ragged edge of timing is not worth the risk!. The step retard is activated by introducing the pink wire in the 6LS’s wiring harness to 12v, and the amount of retard can be adjusted from zero to 15 degrees of timing in 1 degree. However, if the spark happens too. They call it spark advance. I want to minimize this pressure by retarding the timing at crank-start to about 28 degrees. 1971 Yamah AT1 125cc piston port motor with battery powered points ignition. Multicylinder engines show larger gains than single cylinder engines because of cylinder to cylinder mismatch compensation. Ignition timing is quite simple and the benefits to be gained are great namely more power, longer engine life and better gas mileage. They retarded the cam for high end power. People retard engine timing to compensate for poor air/fuel harmonization and/or increased cylinder temps from SC/TC/N2O. Key words: ethanol, ignition timing advance, emissions. The net effect is that fuel efficiency is reduced, and the power rating may need to be reduced, as well. The ‘general rule of thumb’ for retarding your ignition for nitrous is pulling (or retarding) 2* for every 50 horsepower worth of nitrous you intend on spraying. Fuel is not timed. 05 Tune for the 2016+ Tacoma 3. Some engine combinations benefit from this retard, while others may experience rough starting or starter kickback. The advance lever should always be advanced 1/3 to 1/2 travel (13 to 20 crankshaft degrees BTDC) on the steering column quadrant after. A turbo forces air into the combustion chamber, increasing the pressure. If the timing is just a little late the result is a slight loss of power and a little dip in fuel economy. Restart the engine, and give it 12-15 degrees of advance at idle, and go for a spin. Higher octane (100+) racing type fuel may be required as well as spark plugs 1 to 2 heat ranges colder than normal with gaps closed to. However, if the spark happens too. Never before has an ignition system offered as much customization as Mallory FireStorm. When a piston Normally Aspirated Versus Boosted. I gave it an 8 degree advance and the Ford Ranger came to life and hauled ass. Now in my 60’s I drive a little different but am more amazed at the smoothness and even running that can be dialed in. At this point, retard the timing by one degree. 2l M104 and so want same potential benefits. We will discuss the importance of seat-to-seat timing below under Opening Rate. 99 second ¼-mile Civic that has 300+ wheel hp on a 2. RevTech Electronic Ignition System Single-fire ignition system without Advance Unit Assembly Fit Sportster models from 1971 thru 1979 and Big Twins from 1970 thru 1979 NA Note: For proper results, matching high-performance coils must be installed in conjunction with the CCI #59-752 and #59-755 single-fire kits. (Three types, if you count injector pulse, but injection timing on gasoline-powered busses is tied to ignition timing and is not separately adjustable so. The timing of the spark is important, and the timing can either be advanced or retarded depending on conditions. It requires a period of time. Experiments were conducted at the engine speed of 1500 rpm, and loads between 7 and 11 bar indicated mean effective pressure (IMEP) with using. This is important as it serves as the basis for the other two settings. Re: How does timing retard increase top-end? 05-02-05 03:39 AM - Post# 685231 In response to Chevytu Easy way to find out if your combo needs a High RPM, High gear retard is to run it at the track. A setting that gives a good HP reading on a 5 second Dyno run is usually too advanced for continuous load applications. Reduction of the timing advancement to the correct amount keeps the engine from fighting against excess cylinder pressure. is a VERY general explanation of the four-stroke side of things. They call it spark advance. Aprilia and BMW both close the electronic throttle (fine modulation, wide range of authority, slow response) and also retard the ignition timing. The changes we make during tuning considerably affect combustion and this calls for an adjustment in ignition timing. 4-1) Test No. 05 Tune for the 2016+ Tacoma 3. Spark timing retarded to far will cause late combustion, losing the opportunity to take advantage of the most efficient part of the power stroke, at the top where the highest pressures occur. “Retarding the timing allows more of the fuel to burn in the exhaust. Unfortunately, they retarded the ignition timing, because the distributor ran off of the cam. need input on a bypass wiring 55 watt back-up lamps where should my relay be msd ignition for supercharged engines car running a bit hot also i want to know about relays and fuses found in the. For nitrous oxide applications the timing retard can be activated using the dedicated timing retard activation input to the LNC-2000. specification of valve timing in spark ignition engines. Now in my 60’s I drive a little different but am more amazed at the smoothness and even running that can be dialed in. Reasons for doing this would be for non-computer managed fuel economy, a car that has minor forced induction and non-computer management, if the vehicle isn't performing as desired, and some engines will actually benefit and gain horsepower from retarded timing. The control knob mounts to the dash board for easy and accurate timing adjustments up to 15 Degree. Conversely, for hot starts the timing needs to be retarded because otherwise there is the. In the lower gears, the ignition timing is retarded for non-specific reasons. Effect Of Changes In Cam Timing And Lobe Separation Angle The following tables illustrate how variations in lobe separation angle and cam timing will effect the behavior of the engine in which the camshaft is installed. When the crank reaches the timing point an electric current is fired off to the spark plug. If you do not have 400 GT OM, ferraridatabase. If you retard the ignition timing, the piston will travel upwards even further before the fuel is ignited - won’t this lead to. Retarding of the timing is just a way of preventing detonation if it's occuring. Advancing the timing typically gives more bottom end and gives a bit more hit in the mid range and you lose some top end. If the timing is just a little late the result is a slight loss of power and a little dip in fuel economy. The first is ignition timing that is, the amount of spark lead that is set using a timing light (aimed at the harmonic balancer with the engine at idle). The control knob mounts to the dash board for easy and accurate timing adjustments up to 15?. I start with where I am at then retard it 2 * and try again. When tuning gasoline engines, in addition to increasing the turbo pressure and injection, we also adjust the ignition by advancing it or retarding it, as necessary. 180 degrees at the maximum RPM of 3000. A Basic Overview of Cam Timing. In order to set the timing correctly, it is necessary to lock out the automatic spark advance feature in the ignition module. other hand retarding ignition timing will allow the engine to rev higher and make better power, but basically if i time the ignition to 1. Ignition and knock control: The ignition system uses one ignition coil per cylinder (mounted under the engine cover (red arrows)), with each coil mounted above a spark plug. fgutie35 - in regards to fuel quality it does not affect ignition timing but a lower quality fuel does not support combustion the same way as a higher octane rated fuel or fresh fuel does - also the age of the fuel does definitely change the quality of that fuel - a common explanation is that the higher 'ends' of the carbon chain (fuel chemistry- these higher ends are what support combustion. A cool bath—not icy or cold—is enough to feel soothing and refreshing without blunting the signal pathways. Another way to prevent detonation, is to richen up the mixture, and run colder plugs. And finally, they allow for more precise control of the spark timing, which can improve efficiency, emissions and increase the overall power of a car. Also if using a strobe to set the timing at idle, the original distributors will already be advancing as minimum rpm is in the 200 order (400 engine) so below idle speed so if you set to book speed at idle (10 degrees) you will actually be setting about 1 to 2 degrees retarded from the static setting. When you are trimming the wires to length for a tidy ignition harness, be sure to leave enough slack so the distributor can swing back and forth to achieve the required timing. This protects the engine when the driver goes to full throttle after the TMIC has heat soaked. These maps are fully configurable for engine speed and manifold absolute pressure (which is an indication of engine load). For more information on ignition systems and related topics, check out the links on the next page. specification of valve timing in spark ignition engines. This will help prevent damage to the engine as it goes through the pre-ignition process. Average exhaust emissions were reduced on 194 cars by 53% HC, 33% CO, and 31% NOx. Make sure your idle RPM is above the start retard setting in order to set your timing correctly. does it differently. org In a spark ignition internal combustion engine, Ignition timing refers to the timing, relative to the current piston position and crankshaft angle, of the release of a spark in the combustion chamber near the end of the compression stroke. Increased fuel mileage and performance are just some of the benefits as the ignition timing can be advanced or retarded to prevent engine detonation. The cam timing for the intake cam would ideally be retarded which would move the intake cam opening event farther away from the exhaust valve closing event so as to reduce or eliminate overlap, and as a side effect the power stroke duration will increase by retarding the intake cam which can also compensate for the lost power from the duration. It just seems to make sense that higher cylinder pressure would result in higher EGTs unless something weird is going on. The electronic ignition can’t change the fuel flow in the carb. 2) A low but steady reading between 10" and 15" would be caused by retarded ignition or valve timing, or low compression. 4) If the needle fluctuates as you increase the engine speed, you have either an ignition miss, a blown head gasket, a leaking valve or a weak valve spring. The advanced timing will give you higher cylinder temperatures and exhaust temperatures and thus a greater chance of pre-ignition. The changes we make during tuning considerably affect combustion and this calls for an adjustment in ignition timing. For this reason, they've designed the VVT system. Symptoms of Retarded Ignition Timing. This degradation can cause a narrowing point gap, retarded timing, increased dwell, and, eventually, a very poor-quality spark. The intake valve is closing AFTER the piston has started to travel back up the bore for the start of compression stroke. In turbocharged and supercharged engines the amount of retard can. The Timing Retard capabilities of the LNC-2000 can be used to retard timing by up to 15 degrees. - retard the tune to a quite safe state, get sure that your tune is a few degree back from the knock treshould and the turbo doesn't run at the edge. The distributor may need adjusting to prevent crossfire. Retarded start of injection is a commonly used primary method for effective NO x emission reduction in the diesel engines and has negligible effect on fuel consumption when keeping injection duration conveniently short. Also if using a strobe to set the timing at idle, the original distributors will already be advancing as minimum rpm is in the 200 order (400 engine) so below idle speed so if you set to book speed at idle (10 degrees) you will actually be setting about 1 to 2 degrees retarded from the static setting. I start with where I am at then retard it 2 * and try again. Retarding the timing can help reduce Detonation. Further, if your existing ignition is working well, I would suggest that there is nothing that you will add by switching to Sniper EFI-controlled ignition timing that could possibly be worth the nightmare you are about to experience. - The JRSC needs very little ignition timing retard vs. need input on a bypass wiring 55 watt back-up lamps where should my relay be msd ignition for supercharged engines car running a bit hot also i want to know about relays and fuses found in the. Advantages of VCT DEPS. From drag racing experience - most racers with a small block advance the cam timing to improve their "launch". The control knob mounts to the dash board for easy and accurate timing adjustments up to 15 degrees. The emphasis is on gaining more degrees of retard at high rpm. Effect Of Changes In Cam Timing And Lobe Separation Angle The following tables illustrate how variations in lobe separation angle and cam timing will effect the behavior of the engine in which the camshaft is installed. CAUTION: You must recheck your piston to valve clearance after advancing or retarding you camshaft timing. The Control can be used on 4, 6 and 8-cylinder engines and must be used with an MSD Ignition Control. later start of injection to avoid too high firing pressures. Why then does my manual say to use 87, and using higher than that won't give me any benefit? Also, later on I would like to increase my compression ratio, will the ECU retard the ignition timing when it detects knock then?. Retarding is like swinging to late. Retarding the ignition timing can be useful for a few things, but is generally left untouched. Watching the MPH run the car varying the high speed timing 2* at a time. A setting that gives a good HP reading on a 5 second Dyno run is usually too advanced for continuous load applications. Engine speed (rpm) and load will determine how much total advance is required. Optimizing ignition timing for gasoline engines. there isn't ever any benifit to retarding the timing, despite what MSD might have to say. octane booster is going to cost you everytime you fill up, retarding the ignition timing is a pretty much end of problem fix. The retarding basin will help manage increased stormwater flows expected from new urban development in the north and west of the catchment, particularly in the Thompsons Road (PSP53), Clyde Creek (PSP54), Casey Fields South (PSP57), and Clyde South (PSP56) precincts. taking the spark initiation closer to tdc). So the fuel saving is just not real. This means that the faster the engine goes, the earlier the spark has to occur. ignition retard relay starter relay is being retarded. The intake valve is closing AFTER the piston has started to travel back up the bore for the start of compression stroke. ) usually adds a small amount of power (often 1+HP) by eliminating the. When you are trimming the wires to length for a tidy ignition harness, be sure to leave enough slack so the distributor can swing back and forth to achieve the required timing. 89 166mph Timing 38 at launch and retarded to 31 at 5 seconds out= 4. If your engine is experiencing knock, you’ll need to run a higher-octane fuel or retard ignition timing. The energy ratio of pilot diesel. Ignition Tuning 201 How To Use an Air/Fuel Meter to Optimize Your Ignition Timing Curve as published in British V8 Newsletter, Volume XV Issue 1, April 2007 by: Jeff Schlemmer, proprietor of Advanced Distributors, LLC When it comes to selecting an ignition system, most people are left with more questions than answers. Ignition timing, optimized for the gasoline, was found suitable for the E85 fuel from the emission analyses point. With retarding the timing, you're placing the completed burn later and the fuel will finish burning on it's way out the manifold. Unless the builder has access to an engine dynamometer or has advanced knowledge of the dynamics involved, advancing/retarding a cam is nothing but a shot in the dark as to whether it will result in any benefits at all. were reduced with the ignition timing retard. As you increase the throttle, the module senses this anddecreases the amount of retard. Retarding your ignition timing with nitrous not only will help keep your engine safe from detonation and parts failure due to heat, but it will also help you get as much power as you can out of your nitrous system. Above: Our 1970 Dodge Charger R/T packing its original 440 still. Altitudes above 1,500ft, 36 degress total ignition advance is required for optimum performance. Well the ignition pinging is very distinctive and I don't think the mechanics were that incompetent to make a mistake on that. ) Retarding the ignition timing will reduce knock. Our complete list of changes are outlined below, and brief explanation of each change. A bad spark plug wire or a fouled spark plug will act just like a weak or. If it is dragging so bad you can't even start it, retard the timing a little bit and try to start it. The foremost parts of a CDI include the stator, charging coil, hall sensor, flywheel and the timing mark. The performance gain comes when ignition timing for each cylinder is instantaneously adjusted to the minimum retard that allows only infrequent light knocking. Turbo charging or increasing the compression ratio changes the mixture density (more air and fuel molecules are packed together). Conversely, for hot starts the timing needs to be retarded because otherwise there is the. 071" BTDC for all CDI models and. Diesel ignition timing is determined by when the fuel is injected into the cylinder, since it detonates upon injection. Whatever you gain on the bottom end you will lose on the top. This is known as ignition timing advance. 2) Those 1966 through 1970 vehicles equipped with "NOx retrofit devices" with a 4° retard in basic ignition timing (i. Increased fuel mileage and performance are just some of the benefits as the ignition timing can be advanced or retarded to prevent engine detonation. To address the first point, after the second test failure I did a “ Seafoam ” treatment in an attempt to remove carbon buildup from the ports, valves, and cylinders. Save Ferris! It is not possible to set timing accuratly without a reasonable steady idle. Some engine combinations benefit from this retard, while others may experience rough starting or starter kickback. The Model A ignition uses a zero crankshaft degree (TDC) initial timing point so that the engine can be easily started by hand crank, however it should never be run under load in this "retarded" position. If it happens at low RPM and heavy engine load and it does not happen during cold runs, chances are your ECU is not reading the changing load condition in time to retard ignition timing. This gives you the "window" to retard the timing in, but the phasing is incorrect unless you activate the retard box and are pulling out all 20 degrees. CONCLUSION Increased fuel mileage, power, performance and reduction in emissions are just some of the benefits as the ignition timing can be advanced or retarded to prevent engine detonation. Idle stability can be improved by slightly advancing the timing when idle speed drops and retarding the timing if it’s too high. 1) Those vehicles originally equipped with breakerless ignition systems or dual point ignition systems where one of the points is used to retard timing for emission control. How To Check For Correct TDC (heads on the engine): There are two methods that work well to check for correct TDC with the heads still on the engine. The timing of the spark is important, and the timing can either be advanced or retarded depending on conditions. Effects of Retarding the Ignition Timing on Horsepower. The control can be used on 4, 6 and 8-cylinder engines and must be used with an MSD Ignition control. On top of that there's already 4deg on the flywheel on my 327F's. Ignition Timing Comments, continued Why Retard the Timing Beyond the Factory Setting? Retarding creates a softer low-end engine response for riders who rarely ride at maximum RPM. As an example, timing is accurate within +/-0. We will discuss the importance of seat-to-seat timing below under Opening Rate. This means that the faster the engine goes, the earlier the spark has to occur. Spark timing retarded to far will cause late combustion, losing the opportunity to take advantage of the most efficient part of the power stroke, at the top where the highest pressures occur. Increased fuel mileage and performance are just some of the benefits as the ignition timing can be advanced or retarded to prevent engine detonation. 84 169mph There is probably a significant AF ratio factor in this as well. When you unplug the distributor it advances about another 5-6deg. Retarding the cam timing increases upper rpm horsepower. People retard engine timing to compensate for poor air/fuel harmonization and/or increased cylinder temps from SC/TC/N2O. As an example, timing is accurate within +/-0. Can't get rid of that Stinky Rich Exhaust at idle? The MSD distributors come with 3 bushings with the largest one being 18* so when installed it will give you 18* of mechanical advance. But the speed of the pistons increases as the engine speed increases. (no mention of magneto or battery) Clymer manual that. (Three types, if you count injector pulse, but injection timing on gasoline-powered busses is tied to ignition timing and is not separately adjustable so. Depending on the unit you choose, they are capable of controlling timing, spark curves, single and dual stage rev limits, and variable ignition retarding for boosted applications. Benefits include the elimination of distributor cap and rotor wear, reduced spark energy losses caused by long spark plug wires, and the ability to optimize your ignition tuning parameters. Had the motor rebuilt, now the idle is erratic, it pings when loaded up, and at idle, the timing is retarding and advancing itself by a span of 30 degrees, 15. The crankshaft sprocket features three keyways to allow you to advance or retard your camshaft with using offset keys or bushings. The power difference between detonation and 3-4 degrees of retarded timing from this point is negligible, so riding the ragged edge of timing is not worth the risk!. 90 167mph Timing static 36* 1/8 mile ET 4. Ignition timing is setting the point at which the sparkplug fires relative to where the piston is in the cylinder. The control knob mounts to the dash board for easy and accurate tim­ing adjustments up to 15°. I start with where I am at then retard it 2 * and try again. This is important as it serves as the basis for the other two settings. For example, if the timing specified by the manufacturer was set at 12 degrees BTDC initially and adjusted to 11 degrees BTDC, it would be referred to as retarded. As we all know, severely retarded ignition timing will result in significant power loss, increased water and oil temps, and high exhaust gas temps. Retarding the timing can help reduce Detonation. Consequently, Most of the time power will fall and fuel consumption and emissions will increase. the ignition timing technique should only be used when turbocharger. 1) Those vehicles originally equipped with breakerless ignition systems or dual point ignition systems where one of the points is used to retard timing for emission control. The TC88 ignition, being a high performance oriented ignition, has a great need for proper voltage than the stock module. When the spark fires closer to TDC, the pressure rise in the cylinder isn't as great. Also, after-market ratio-rocker arms help a lot on late model cars. Further, if your existing ignition is working well, I would suggest that there is nothing that you will add by switching to Sniper EFI-controlled ignition timing that could possibly be worth the nightmare you are about to experience. Blown5402, the Mallory mag as do all mags retard the ignition when under a load. Soylu and Gerpen developed a two zone thermodynam-ic model to investigate the effects of ignition timing, fuel. But if you don't have any pinking under heavy load at say 3000 rpm, you have probably got the timing about right as it is. The control can be used on 4, 6 and 8-cylinder engines and must be used with an MSD Ignition control. Retarding the timing of either cam reduces the massflow through that port – Retarding the flow cam increases massflow through the swirl port and vice versa A large variation possible: Minimum – maximum flow varies by a factor of 3 Total massflow is relatively constant, with a variation of 10% over the map range. The BGM flywheel has timing marks on the side so you don't even have to put a mark on your casing for your desired ignition timing. FEATURES AND BENEFITS Optimum Performance - The DSM will advance timing to the nameplate timing value as engine conditions allow. Increased fuel mileage and performance are just some of the benefits as the ignition timing can be advanced or retarded to prevent engine detonation. The easy-to-use interface allows you to create a custom timing curve for your engine, adjust a single stage of nitrous timing retard, and set up to 20 degrees of automatic start retard. A thermostatic vacuum switch provides engine cooling protection with the retarded ignition. The ‘general rule of thumb’ for retarding your ignition for nitrous is pulling (or retarding) 2* for every 50 horsepower worth of nitrous you intend on spraying. The timing won’t be spot on, and you may have to adjust the distributor a bit to advance the timing a little if you had it turned too far retarded to run well, but it should fire up. This is known as ignition timing advance. The default position for the ignition is RETARDED. Reasons a Late Model Vehicle. I definitely noticed a difference at this setting. In developing this ignition we have provided many technical benefits that have not been available to the Lambretta owner; these include the following: 1. Retarding the cam will move the power band up in the RPM range. Advancing the ignition timing TOO MUCH at any speed will result in less power, and may result in damage to the engine. Increased fuel mileage and performance are just some of the benefits as the ignition timing can be advanced or retarded to prevent engine detonation. The foremost parts of a CDI include the stator, charging coil, hall sensor, flywheel and the timing mark. When you are trimming the wires to length for a tidy ignition harness, be sure to leave enough slack so the distributor can swing back and forth to achieve the required timing. hand advancing the ignition timing causes rise in NO formation due to increase in pressure and temperature during the combustion process. The Porsche Technical Specifications booklet tells me I should be at 2 degrees + or - 2 BTDC at 900+or- 50 rpm with vacuum connected So I warmed up the engine then connected up the strobe. Higher octane (100+) racing type fuel may be required as well as spark plugs 1 to 2 heat ranges colder than normal with gaps closed to. The 6LS also has a built in step retard (Sw Retard) that can help you dial back your timing at a specific RPM point, making it ideal for cars running nitrous. could be achieved by leaving the mixture at the leaner optimum and retarding the ignition more instead. Estimating the amount of wear with a reasonable degree of accuracy is not hard to do. Things to Consider. It should start fairly easily. If the CHTs go down dramatically, retard the timing slightly. Retarding the timing means the plug fires later in the compression stroke (closer to TDC). Retarded full load injection timing reduces nitrous oxide NOx emissions and light load advance travel capability to 28 engine maintains misfire margin at part load. Both can be triggered by a trans-brake input; Gen 3 Ultra Dominator Style 4 Bolt Air Cleaner Flange-8AN Fuel Inlets; High Resolution Full Color Touchscreen for Initial Setup, Tuning, and Gauge Displays. This is accomplished using the timing connector plug # 22747. When activated, the timing will be retarded whatever amount the module value is. When the crank reaches the timing point an electric current is fired off to the spark plug. Note: Retarding timing reduces emissions, its common to LOCK OUT timing to 10 degrees for emissions compliance on heavily modified street vehicles. In the second round, ignition timing of the spark plug B was advanced by 50 (310 bTDC) and retarded by 50 (260 bTDC). Higher-than-normal vacuum at idle is a common clue to overly advanced ignition timing, while low vacuum can indicate retarded timing. on my All motor CRX, I was able to wring 20 HP out of the 1. 4 mm before top dead center (factory setting) there should't be any need to advance the ignition as rpm goes up, mainly because the mixture is broken up into smaller droplets and the mixture burns faster ?. does it differently. The module sends a voltage signal to the engine control module if knocking is detected, which prompts the retarding of ignition timing until knocking stops. A handy device to have is an ignition system with a "boost retard control," such as the Holley Ignition P/N 800-450. Increased fuel mileage and performance are just some of the benefits as the ignition timing can be advanced or retarded to prevent engine detonation. fgutie35 - in regards to fuel quality it does not affect ignition timing but a lower quality fuel does not support combustion the same way as a higher octane rated fuel or fresh fuel does - also the age of the fuel does definitely change the quality of that fuel - a common explanation is that the higher 'ends' of the carbon chain (fuel chemistry- these higher ends are what support combustion. A genuine 180 watt 12VDC system. A worn timing chain, chain guides or chain tensioner can also cause a variety of noises originating from the timing chain cover area of the engine. There are three kinds of timing. Diesel fuel has a two-stage-ignition property, which could lead to more stable late-cycle auto ignition. The overall cam timing can be characterized using four opening and closing parameters. Although retarding is less common compared to advancing, it can repair a lag or smoking problem within a marine engine. Need Help KTM 125/200 Ignition Timing. The timing light flashes every time a spark occurs, and by pointing the timing light at the crank pulley we can view the timing marks while the engine is running. A turbo forces air into the combustion chamber, increasing the pressure. ignition timing for stage 1 kit: Turbo: 5: Aug 17, 2011: Timing Retard Eliminator: General Bike Related Topics: 11: Aug 17, 2011: should you re-tune if you pull timing? Turbo: 1: Aug 16, 2011: D: intake cam swap timing: All Motor: 4: Jun 28, 2011: M: MR 12 Fuel timing and AFRs: All Motor: 2: Jun 25, 2011: S: Timing Retard Eliminator on an 11. Fit Sportster models from 1971 thru 1979 and Big Twins from 1970 thru 1979. When combustion occurs it does not take place instantly. The control can be used on 4, 6 and 8-cylinder engines and must be used with an MSD Ignition. 3) A very low reading between 4" and 9" means you have a vacuum leak. Not much use to your situation. Once the engine is running, the lever is adjusted by hand to an advanced position, where usually it is left alone for the remainder of the journey. Retarding the timing means the plug fires later in the compression stroke (closer to TDC). Although retarding is less common compared to advancing, it can repair a lag or smoking problem within a marine engine. You may be lucky to have a rare EI that times accurately from the initial static setup, or if you only trickle about doing only a few occasional miles with the timing set only vaguely in the right are. Increased fuel mileage and performance are just some of the benefits as the ignition timing can be advanced or retarded to prevent engine detonation. This was done in order to increase exhaust gas temperature (due to "lighting the fire late") to improve the effectiveness of the. This will hurt performance and economy. Recommended Posts. If you retard the ignition timing, the piston will travel upwards even further before the fuel is ignited - won’t this lead to. It mates with the High Energy Ignition system and lets you program your own ignition advance curve. The three stage retard control connects easily to your MSD Ignition and can be triggered from points, electronic ignitions, crank triggers or magnetic pick-up distributors. The sensor seems to detect normal engine vibrations as "knock" (pre-ignition), and because if this, the ECU retards the timing. Knock occurs more frequently when using low octane fuel. So at least in gasoline-burning engines, ignition timing is largely a compromise between a later "retarded" spark — which gives greater efficiency with high octane fuel — and an earlier "advanced" spark that avoids detonation with the fuel used. A Basic Overview of Cam Timing. Increased fuel mileage and performance are just some of the benefits as the ignition timing can be advanced or retarded to prevent engine detonation. 61021 is the vacuum advance canister that was OEM on 76-77 USA points dissy. Octane is relative to how fast the ball is thrown. The FAST® E7 Programmable Ignition is ideal for any street, drag or circle track application where reliable, powerful ignition is required. Sherco Ignition Timing, Rev. The next step is to use a timing light connected to the coil or ignition lead on #1 cylinder and view the actual ignition timing the engine is seeing. 8 is it bad to advance my ignition timing?. Proper timing is all-important to the thermo-efficiency of the engine. Consequently, Most of the time power will fall and fuel consumption and emissions will increase. Kawasaki and Yamaha stator plates are marked. Some engine combinations benefit from this retard, while others may experience rough starting or starter kickback. At low rpm we advance the timing to give more torque in low revs. Blown5402, the Mallory mag as do all mags retard the ignition when under a load. Ignition has to occur at a fairly critical time (hence 'ignition timing') in the piston cycle, and has to be altered according to what the engine is doing at the time - e. Yamaha, alone of the five manufacturers, chooses to use all three torque-reduction mechanisms, dropping cylinder events, retarding the ignition timing, and also closing the throttle. Also, after-market ratio-rocker arms help a lot on late model cars. When the engine is idling, the spark is retarded significantly, to smoothout the engine. The three stage retard control connects easily to your MSD Ignition and can be triggered from points, electronic ignitions, crank triggers or magnetic pick-up distributors. There is a true way to remedy this problem which involves the vacuum advance and the ignition timing. Fit Sportster models from 1971 thru 1979 and Big Twins from 1970 thru 1979. The highest point the piston can go is called top dead center, or TDC. The integral 2. If it pings at high rpm, you may need to retard the timing a bit.