Does advancing timing lean or rich. Finally, the emissions of hydrocarbons at stoichio...
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Does advancing timing lean or rich. Finally, the emissions of hydrocarbons at stoichiometric and rich air/fuel ratios increase with advanced timing, but timing has little influence at very lean air/fuel ratios such as 19:1. 5 no KR. Jul 7, 2022 · Rotate the distributor until the timing mark lines up at zero with the light. 2, if I advance the timing to 18 degrees, would the air fuel get leaner or richer just by adjusting the ignition timing? And vice versa. The ignition timing measurement is in crankshaft rotation degrees before the top dead center (BTDC). It may also be that a leaner air/fuel mixture (closer to optimal stoichiometric ratio) might burn faster than a richer mixture. Scenario 3 Kind of a mixture of the above. Any expert advises ? Jul 29, 2008 · Im not the most mechanically inclined I must admit, and I had a pretty simple question. A good way to enhance your camshaft’s low-speed torque with increased duration is to advance your intake lobe but in relation to your exhaust. What heat range spark plugs are you running ? 3. If so, then that would have similar effect to advancing timing. Move the same calibration onto the motor that 1/2 point lower on compression and you will need to lean the mixture some and advance the timing so to get the same performance. g. This helps prevent the engine from getting flooded with fuel, a process known as ignition advancing. You can use a ported or a non-ported line (non-ported simply adds the vac adv to your initial advance setting, which they say some engines like. Jan 27, 2020 · But the mixture isn't "lean". A mixture with poor atomization of the fuel burns more slowly. ly/KyleDrives_HPAcademy In this video, we discuss air fuel ratio, why different fuels have different air/fuel ratios, what is meant by rich and lean, and what Apr 15, 2007 · If the AFR is set, does adjusting the timing have any effect on it? What does retard do? lean or rich? What does advance do? lean or rich? Thanks, Steve Nov 15, 2019 · A lean fuel mixture will burn slower than an optimal mixture. If the spark plugfires too soon or too late during the compression stroke, damage to the engine can occur over time. What rpm do you set timing at? We would like to show you a description here but the site won’t allow us. Jun 22, 2005 · DOES IGNTION TIMING AFFECT A/F RATIO??? Does retarding and advancing ignition timing on the distributor affect air/fuel ratio? Example, say ignition timing is set at 16 degrees and a/f ratio is 13. The ECU controls Air/Fuel mixture in order to maintain power, efficiency, and emissions. A mixture that is far too rich burns more slowly. quora. 7K views 28 replies 13 participants last post by novafornow May 14, 2018 J Jul 8, 2003 · Step 2 - set vacuum advance, limiting it so that it doesn't pull you into a pinging condition at any throttle level. Can someone explain the effect of advancing or retarding a cam? The cam can be advanced or retarded using the timing chain. I've tuned it like 4 times and it never seems to help. But what is better, more fuel or less? Aug 28, 2025 · A lean mixture (too much air, not enough fuel) is more prone to detonation. What is the vaccume reading at the intake ? 4. Apr 11, 2003 · Fuel Trim Information (Running Rich or Lean?) Some of the most common fault codes (DTC's) pertain to fuel trim. Abate Roger Womack turn towards the firewall 10mo Christopher Young Roger Womack Timing light doesn't always work Aug 8, 2003 · Advancing the entire curve brings the low rpm timing closer to optimum (assuming that knock is not a problem), while the maximum advance may be a bit too much. Mar 3, 2004 · Lean, low density mixutures need more spark advance than rich, high density mixtures. Does advancing timing lean or rich? If you advance your timming you will have to richin the fuel mixture, if you retard the timming then you would have to lean out your carb for it to run best. Some cams have already offset grounded into the cam from the manufacturer. Dec 31, 2016 · I haven't seen the retard/lean situation but it could be the opposite side of the coin (reducing excess advance improving the burn), as I have often noted a slight (and puzzling, at least to me until now) leaning of the WBEGO-derived AFR readings when sneaking up SA from 'known safe' to MBT (Minimum spark for Best Torque) (Whoa, "Acronyms 'R Jun 23, 2009 · Can anyone tell me what timing has to do with the overheating of an engine? How they are related to one another. Apr 19, 2025 · Ford Y-Block MeganandKyle SarrattApr 19, 2025 Load o matic which way do I turn the distributor to advance timing trying to lean out the engine a bit Russell Snider and 9 others 10 34 Roger Womack Get a vacuum gauge and timing light 10mo 2 William J. We would like to show you a description here but the site won’t allow us. Nov 21, 2004 · Does retard the timing in any car cause the car to run lean or richer ? Thanks caddycarlo 11-22-2004, 06:22 PM Nov 21, 2004 · Does retard the timing in any car cause the car to run lean or richer ? Thanks caddycarlo 11-22-2004, 06:22 PM Feb 13, 2007 · Ok, so it sounds like more of a sensor measurement timing issue. 6. Sep 8, 2022 · AFR gauge to lean out. Ignition timing is an important process when it comes to running an engine. com The timing advance does not affect the mixture. Yes, you can move the powerband a bit with timing, but to do it in a productive way means that the timing should also suit your heads and fuel. Right now I have my tune setup on the rich side 11. Our team of experts have prepared the ultimate guide on everything you've ever wanted to know about Ignition timing. So now my question becomes, if I was achieving an 11:1 AFR before any timing adjustments, but a 12:1 AFR after a few degrees advancing, how do I interpret this? Did I truly lean out my air/fuel curve, or did it only affect the measurement reading and not the actual combustion mixture? Nov 30, 2020 · My questions are: With a rise in combustion temperature resulting from a lean mixture, would ignition advance even be needed? Does the speed up in combustion effect cylinder pressures similar to running more advance? Or does it merely become knock limited earlier in the advance range compared to a leaner mixture. But I personally would not go very much beyond the recommended factory setting on a stock engine. Does over advanced timing cause overheating? Or is it retarded timing? I am trying to study up on this before I crank up my engine for the first time. Engine Running Lean Symptoms Knowing engine running lean vs rich symptoms will enable you to tell when your engine is running rich or lean. What type of fuel pump mechanical or electrical? A rich or lean condition could be caused by sevral things exhauts that burns your eyes is lean Sep 27, 2011 · Re: Timing advances too far and running rich Timing has no effect on mixture? I'd think if the spark wasn't timed right it may not be burning all of the fuel. During the process, the following steps occur: 1. The chamber starts to cool significantly and therefore the EGTs drop causing a very different environment for any unburned fuel. Q) How does this give more power? A) It takes time for fuel to burn so the spark always fires before the piston reaches TDC. From my understanding one can advance ignition timing with higher octan fuels, which increases power output. Vacuum advance, on the other hand, responds to engine load and rapidly-changing operating conditions, providing the correct degree of spark advance at any point in time based on engine load, to deal with both lean and rich mixture conditions. After being cut for the 9th time, I stopped using Occam's Apr 27, 2022 · This is why you have to adjust the timing right when your engine runs too rich or too lean. 7:1 for example) or as a Lambda value. Advancing ignition timing increases cylinder pressure before TDC by igniting the fuel air mixture earlier in the cycle. On 91 octane you'd most likely have to retard your timing. Aug 24, 2014 · Re: degrees of advance in ignition timing per rpms by Warpspeed » Tue Aug 26, 2014 9:40 pm 6 cylinder puller wrote: along with it being very hard to keep from going lean or rich. You should monitor your air/fuel ratio with a wideband oxygen sensor when making timing adjustments. The spark plug fires during the compression stroke. Conversely, if the fuel mixture is too lean, the engine will slightly delay the ignition. The air/fuel mixture in the combustion chamber is ig Aug 28, 2025 · The relationship between ignition timing and air-fuel ratio (AFR) is a crucial aspect of internal combustion engine tuning. The pistons are moving so fast that if the spark fired at tdc it would not burn fast enough before it was down stroke. Jul 2, 2011 · Q) why advance timing? A) By advancing the timing you are igniting the air/fuel mixture a little sooner. Advance timing means the spark plug ignites the air-fuel mixture before the piston reaches the top dead center (TDC), while retard timing means ignition occurs after the piston passes TDC. My experience with a sled - I retarded the ignition on my Formula III (triple cylinder triple pipe) snowmachine a few years ago and the exhaust temperature went down so I compensated with leaner jetting. I do not get pinking at the moment and can dial some more advance in. While the direct impact isn't as simple as a direct shift in AFR like adjusting a carburetor, advancing timing significantly *influences Jun 19, 2009 · What should you do to the timing, if anything? Some things, possibly misconceptions, that I've heard in the past: - Advance timing until it knocks and then back off 1-2 degrees - A the flame front in a lean mixture burns slower, so more timing advance is appropriate, (intuitively a rich mixture would need less advance) - More timing Jan 31, 2025 · Quote from ODB Eleven forum "When your car's engine detects a fuel mixture that's too rich, it adjusts the ignition timing to occur earlier. Here is an explanation of fuel trim and what it does for us. Apr 8, 2003 · That being said if you put timing to the edge for peak performance and lean the fuel mixture to 12. Jul 27, 2010 · Hello, I'm wondering what effect timing has on a lean or rich condition? Thanks Aug 27, 2008 · Will save you a fortune in needles. Rich during spool should still spool the turbo faster, even with the more advanced cooling, since the burn continues so late in the cycle that it extends into the exhaust manifold, where the cooling benefits of the 4b11t (aluminum block/head, etc) don't really come into play. Retarding the timing makes the mixture start to burn closer to tdc. Jun 5, 2016 · The Following 2 Users Say Thank You to rmay635703 For This Useful Post: Jul 6, 2011 · So I see mainly jap cars where they tune 10:1 and run loads of ignition, but here in Aus people tend to run more like 12:1 with less ignition timing. Nov 17, 2025 · What is advance and retard timing? Short Answer: Advance and retard timing refer to the adjustment of the spark timing in an internal combustion engine. 6 :1 it runs like a bat out of hell. When you depress your gas pedal, you are opening the throttle blades and letting air into the system to lean it out enough to get going. when a tune is rich, will jacking the timing up compensate for the rich condition? now dont get me wrong, im not talking soo far rich that its black smoking the whole way down the quarter. Oct 13, 2021 · Learn more on how to shoot and adjust ignition timing. To simplify things; short tracks = higher compression & more ignition advance, long tracks = lower compression and less ignition advance. Jan 29, 2016 · 17 I learned in this question that running an engine fuel-lean will increase the temperature of ignition, among other things such as causing problems with the catalytic converter. At stoichiometric and lean air/fuel ratios, increasing the ignition timing can reduce specific fuel consumption substantially. That is one Sep 15, 2002 · I'm confused-- (4_inch_Bore) Pinging is also know as pre-ignition, or detonation. I'm more in the camp of a Leaner A/F w/ less timing for the reasons illistrated here: You CAN be too Rich Ultimately, a good tuner lets the dyno decide especially on questions of timing. I have richened up the mixture to make sure the spark plugs are biscuit coloured at Jun 17, 2010 · I would think it does still hold true. 2. I've searched hard found nothing. Mixture and timing are independent, but related as above. Does advanced timing lean or rich? as was brought out, the timing has little effect on rich/lean issues and even less on a computer controlled engine. wouldnt you make more power this way, by lighting it off earlier? Just a If so, then advancing ignition timing would give more time for the mixture to burn completely and that would produce an exhaust similar to a leaner mixture. Jul 28, 2008 · This is where the exrta power comes from. How is it calculated? Total Timing = Initial Timing + Mechanical Advance How is it set? Determine your desired total timing. Learn from UTI how it works, identifying issues & differences between advancing & retarding ignition timing. What does an extra few degrees do to performance? After doing some research last night I know that I need to determine if TDC lines up with the pointer before I start adjusting the stop. Oct 8, 2013 · I see some guys say lean and mean, and other are saying rich. Turning the distributor counterclockwise will advance the timing, while turning it clockwise will retard the timing. Stop turning the crank and read the degree wheel. You must first understand timing and how the engine works. . Where the added cooling DOES come into play is running advanced timing/lean May 24, 2016 · Probably dripping a bit of extra fuel into the intake when you're shutting down (or leaking past your gasket) making the fuel mixture too rich to ignite. Jul 23, 2007 · I adjusted my timing up (without the vacuum advance, my parts store only stocks the Crane adjustable and was out of the one I needed). Lots of exhaust gas dilution, such as is the case at idle with a high overlap cam further increases the ideal timing requirement. While not the best method, in most cases it can be eliminated by retarding the timing regardless of the Sep 1, 2017 · In a spark ignition internal combustion engine, the purpose of advancing the timing of the engine spark is to get past ignition delay. Understanding whether advancing timing leads to a leaner or richer condition is fundamental for optimizing performance and efficiency. Mechanical advance adds additional timing to the engine and is based strictly on rpm. Jul 11, 2009 · Does it help rich and or lean carb mixtures. Free Engine Tuning Lesson: http://bit. Nov 23, 2009 · Classified ads, photos, shows, links, forums, and technical information for the Volkswagen automobile Feb 8, 2011 · First the facts as gather from this site: A lean mixture takes longer to burn and requires more advanced timing. So the hot combustion products can attain maximum pressure just after the piston reaches to the TDC. NastyZ28. In a spark-ignited internal combustion engine system, ignition timing is known as the period of time at which a spark will come from the combustion chamber close 3. Oct 31, 2006 · Hi guys, Is this safe to say a lean mixture will cause a Ignition retard and a richer mixture will cause a Ignition advance ? So is it ok to say that if the LTFT is high the car will be running with a May 30, 2010 · 77cruiser wrote: Does/should timing affect AFR readings? Richer when retarded/leaner when advanced? I cannot figure why it should be so, and for many years I was certain it was not, but I have now many times seen small but clear changes confirming that indeed increased spark advance results in slightly leaner O2 sensor readings. 5:1 to 13:1 while under power. A rich mixture burns faster and requires May 31, 2009 · The real question is: Does a leaner A/F with Less timing make more power than a Richer A/F and more timing? This quesition is highly debatable. Poor quality of the fuel/air mixture will make it burn more slowly. The further it is advanced, the earlier the spark will fire "before" TDC. General question: can too much timing cause very lean cold starts and dieseling on shutoff? My daily driver has been doing this for about a year and it's just getting worse and worse. Retarding the timing is exactly the opposite. What is total timing? Definition & Description The term "Total Timing" refers to the maximum amount of Ignition Timing applied to the engine. Jul 1, 2004 · If the engine does not have enough ignition spark timing advance it may lack power, have poor throttle response, use too much fuel and cause the engine to run hot, while if the engine has too much May 20, 2024 · I answered this question on Quora: https://www. QUALITY. Jan 1, 2023 · Once initial timing is set, it's complemented by the mechanical and vacuum advance curves. Lean mixtures burn slower as well, thus you need more timing advance to light the mixture earlier to compensate for this so that peak cylinder pressure occurs at the same point after top dead center. Vacuum Advance and Mechanical Advance: – When a small-block Chevy is started, the spark is retarded to 4 degrees BTDC. Mar 1, 2021 · Ignition timing affects your engine’s performance. ? Why does advancing ignition timing cause knock? Several times I have come upon this, but it is never explained properly. Apr 27, 2022 · This is why you have to adjust the timing right when your engine runs too rich or too lean. The time now is 11:51 PM. This can reduce the power of your engine. … This can damage different parts of the engine. ) Set your Timing Light to your desired total We would like to show you a description here but the site won’t allow us. A/F is expressed as either a ratio (14. it can be caused by too much advance for the compression ratio or by too low of octane fuel or by lean fuel mixture or by hot spots in the combustion chamber. Which scenario produces more power? Obviously KR in any of the 3 is bad because it could pull timing more than necessary to Jan 15, 2012 · "The chances of hurting one lean are small, the chances of hurting it RICH, much greater and the chances of hurting it with too much timing, nearly guaranteed". As long as it is not pinging it will probably be ok. Electronic control of ignition timing was introduced a few years later in 1975-'76 with the introduction of Chrysler's computer-controlled "Lean-Burn" electronic spark advance system. 1-2 degree advanced with AFRs in 12. Your best bet when tuning is to set your timing, and make the engine happy at both idle and WOT, then get Apr 27, 2011 · All times are GMT -4. Sep 14, 2021 · Examples: A mixture that is too lean burns more slowly. A rich mixture will also burn slower than the optimal mixture. Examples: A mixture that is too lean burns more slowly. Nov 8, 2022 · What Does Retarding Timing Do? Retarding timing (or advance spark timing) manages the spark plugs fire during the compression stroke. Apr 17, 2006 · Timing does effect the a/f inadverntly. When a cam is installed "straight-up," the imaginary centerlines of the two shafts line up exactly. The key to all of this is either controlling the burn rate of the combustion cycle (race gas or water injection), or cooling the intake charge sufficiently with a larger intercooler. It does not change the volumetric efficiency of the engine. I have no idea how or why. This is also why advancing timing can create knock or pre-ignition. In other words, the spark fires before the piston is finished with the compression stroke. Ignition timing Curves An ignition timing curve is specifically designed to match the engine’s characteristics. The vac advance is disconnected. Adjustment Process: To adjust the timing on a Chevy 350 engine, you can rotate the distributor housing in one direction or the other. So the spark is advanced, mean the spark fires while the pistons is on the upstroke. Effects of Advanced ignition timing: The advancing of the ignition timing affects the Internal combustion (IC) engine performance as described below: Because of the spark advance, the combustion of the fuel completes earlier. Intercooler Efficiency (if applicable): If you have a turbocharged or supercharged engine, an efficient intercooler is essential to cool the intake air charge. go to bottom go to top Jul 3, 2003 · If you're rich, you can lean out the fuel pressure by way of an adjustable regulator and/or you can advance your timing. Click to expand Sep 19, 2005 · Accepted methodology is to run a bit more rich with moderate timing on pump and leaner with plenty of timing on race gas. the timing card of my Crowler Mar 20, 2005 · 1. What is your timing set at ? 5. To retard the timing, the distributor is turned clockwise. My timing tab tops out at 17, but I cranked in a little more, about 19 initial. Will advancing my timing make my car run more lean or rich? Home - ThumperTalk May 5, 2018 · Timing advance and running rich Jump to Latest 6. Required ignition advance is the combination of many factors, but basically it involves the speed of combustion versus the time avaiable. Mar 12, 2014 · Ignition timing is normally in advance of TDC in gas engines because gas burns in a wave-like pattern, spreading outward from the spark plug. By 1979 with the Bosch Motronic engine management system, technology had advanced to include simultaneous control of both the ignition timing and fuel delivery. Apr 28, 2012 · Hard to smell a rich engine ever, in terms of actually diagnosing and fixing, but there is a distinct smell that most will call rich when you have the initial timing advanced, and 16 BTDC will sure get it there, especially if it idles relatively low. Is there something wrong with this? I have been dealing with a lean issue at cruise/part throttle and a rich condition above 4500, or so. It's just not as rich as best power mixture. Ignition delay occurs during the time that it takes to fully ignite the mixture with a spark plug. E. When you advance the timing, you are making the spark fire before TDC. Jan 19, 2018 · The next step is to separate ignition timing into three basic components: initial timing, mechanical advance, and vacuum advance. A mixture of poor quality will require more timing advance. The idea, of course, is to put the optimum pressure on the piston as it drives the crank through it's most mechanically advantageous zone of rotation, which starts at around 15 degrees after TDC. 2 gas scale on e85 with 26* of timing it spools very fast. (See below for basic guidelines. Thanks Ignition Timing VS Air to Fuel Ratio In this article, we are going to shed some light on the hotly discussed topic of how and why the air-fuel ratio and ignition timing affect horsepower. Sep 12, 2002 · To advance the timing on a small block chevy, the distributor is turned counterclockwise. How do you know when your engine is running lean? Just like every other automotive problem, some symptoms indicate a lean running engine. What is the safer way to tune? If you have high temps due to a small turbo running at its limits, would the more fuel + more ignition be the better Aug 12, 2020 · The most important concept to understand is that lean mixtures, such as at idle and steady highway cruise, take longer to burn than rich mixtures; idle in particular, as idle mixture is affected by exhaust gas dilution. This will make less power since the mixture has less time to expand before the piston reaches tdc. Feb 19, 2026 · If you hear telltale signs of the timing of your car not being quite right, such as pinging, backfiring, or if the car runs too rich or too lean, you will need to either take it to a mechanic or adjust the timing yourself. How and why exactly does running fuel lean (or oxygen rich) increase the temperature of ignition? Advancing / Retarding a Camshaft A Basic Overview of Cam Timing To advance or retard a camshaft is to change the alignment between the camshaft and the crankshaft. Apr 6, 2006 · One would expect a power increase due to the AFRs being closer to the lean/best power range correct? Even with stock timing values. Hot exhaust is caused by a lean condition 2. The optimal mixture strength is between 12. Therefore, advancing the timing does not directly make the engine run lean or rich; it changes the efficiency with which the existing air and fuel mixture is consumed. Does advancing timing lean or rich? as was brought out, the timing has little effect on rich/lean issues and even less on a computer controlled engine. Low Power: Ignition timing that is retarded too far can result in the spark plug igniting the mixture too late. This can lead to an increase in horse power at the expense of possible knock and preignition, especially under heavy load. More pressure downwards when the piston is at tdc. This requires that lean mixtures have “the fire lit” earlier in the compression cycle (spark timing advanced), allowing more burn time so that peak cylinder pressure is Sep 28, 2004 · With my initial timing at 12*, warm idle (1000 rpm), spout removedwhen I put the spout back in it immediately jumps to 16* total. Jan 29, 2009 · Richer/Advance or Lean/Retard ? Which is the better options ? To richen it and advance timing or lean the mixture and retard timing ? My thought will be, by running richer, we run lower risk than leaning the mixture ? However, enriching the mixture first causes worser fuel consumption and also introduces incomplete burn. Jul 7, 2022 · Does retarding timing use more fuel? This causes your engine to use more fuel to compensate for reduced power. Apr 30, 2024 · Here are some key points to consider: Initial Timing: – The initial timing for a small block Chevy is typically set at 4 degrees BTDC (Before Top Dead Center) when the engine is started, and it advances as the engine runs. com/Will-advancing-timing-make-a-car-run-more-lean-or-rich/answer/Scott-Krager My video answer to the qu Sep 4, 2024 · The total timing at higher RPMs, such as 3000 RPM, is typically around 38 degrees. The car is running rich at idle with spark plugs sooting up but leaning out above 3000rpm when I check the spark plugs. Mar 19, 2006 · I agree that advancing the ignition does lead to higher engine temperatures and the need to jet richer for the increased advance. Mar 18, 2020 · Hi all, I have a question to all the cam / engine experts. The trouble is that the piston is moving so fast that the Aug 17, 2011 · Ok, heres what im wondering. the ecm looks at all of the parameters and calculates the needed corrections to a burned in fuel map. The factory setting is the way they are for a good reason.
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