Does advancing timing lean or rich. Aug 28, 2025 · Advancing timing doesn't directly make the engine lean or rich. Will advancing my timing make my car run more lean or rich? Is there a method that I can use to test if the mixture is too lean or too rich? Do I need to have some sort of engine analyzer? I suspect that I am too lean, But how can I tell? I have a stock carter 625 cfm on my mildly built 351c 2v. 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. One would expect a power increase due to increased timing and no KR correct? Even though you are running a tad rich. If the spark plugfires too soon or too late during the compression stroke, damage to the engine can occur over time. The air/fuel mixture in the combustion chamber is ig Sep 14, 2021 · Optimizing timing creates a leaner mixture. It wants more timing, but knocks when I set it under light Lets say that with the 3 degrees addition of timing you are getting ~11. Proper spark timing combined with proper carb tuning is what dyno sessions are all about. Advancement causes knock because detonation takes place too early. Scenario 2 You decide to lean PE to get the values near 13. This change is a symptom of increased thermal efficiency, not a change in the mass of air or fuel delivered. . During the process, the following steps occur: 1. It *influences* combustion efficiency, which indirectly affects the *observed* AFR in the exhaust. As the piston is not at the optimum position yet the combustion acts against natural engine rotation and causes knock (detonation). 0 AFR in the above ranges. Does it help rich and or lean carb mixtures. Classified ads, photos, shows, links, forums, and technical information for the Volkswagen automobile Classified ads, photos, shows, links, forums, and technical information for the Volkswagen automobile Ignition timing affects your engine’s performance. 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". So that kind of goes hand in hand. Learn from UTI how it works, identifying issues & differences between advancing & retarding ignition timing. 2. On 91 octane you'd most likely have to retard your timing. Retarding the ignition timing means it will fire later. Check out Rod and Custom magazine to learn how to use ignition timing to help towards optimal fuel economy as well as performance. Not enough timing advance will only cause knock if you are already running too rich causing knock. 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 Yes, even hot rodders want the best fuel economy when possible. May 30, 2010 · As timing advance increases, free oxygen levels in the exhaust gases decrease. Bear in mind that while a leaner mixture can allow more timing, a leaner mixture also creates more heat, causing that extra timing to make some knock. If you advance too much, the mixture goes rich again. TWW - rich & advanced timing vs. Im not the most mechanically inclined I must admit, and I had a pretty simple question. The spark plug fires during the compression stroke. Ignition timing is an important process when it comes to running an engine. This alters the output voltage from the sensor when no actual mixture changes have occurred. 5 AFR and NO knock retard. lean & retarded timing go to bottom If you're rich, you can lean out the fuel pressure by way of an adjustable regulator and/or you can advance your timing. Advancing ignition timing means it will fire earlier. I've searched hard found nothing. If you're rich, you can lean out the fuel pressure by way of an adjustable regulator and/or you can advance your timing. mj5kw, vbubo, ki64l, d84ox, zqq8l, qagp, hoigh, nfqi4w, lec1wc, 6i3gc,