How does ignition timing affect AFR?
How does ignition timing affect AFR?
Increasing Ignition Timing generally increases torque, which increases the fuel consumption at that load point… WHICH, will require more fuel to sustain a given AFR. That’s why when you are tuning, you tune the AFR, tune the timing…then yu have to go back and touch up the AFR Curve.
What should ignition timing be at WOT?
At WOT, the air and fuel are tightly packed and burn quickly so we don’t need as much timing. At 2,800 rpm at WOT, 32 to 34 degrees of timing could be just about right for a typical pump gas street engine.
What’s the ignition timing on a Chevy small block?
Initial timing may range from 5-degrees BTDC to zero and total around 28 to 32 at the most degrees. When the engine is cruising at part throttle, the pressure just prior to ignition is substantially reduced due to the fact that the engine is throttled. To get fuel efficiency under such circumstances,…
Why is ignition timing important in an engine?
by Don Bowman. Ignition timing refers to the point at which the spark plugs ignite the fuel within an engine’s cylinder. Proper timing is all-important to the thermo-efficiency of the engine. The first thing to keep in mind is that fuel burns at a certain rate in an engine regardless of the rpm.
Is there a way to advance the timing of an engine?
Under these conditions the engine will tolerate and indeed benefit from advancing the timing by up to 15 degrees over its normal setting. The device that usually performs this trick is called the vacuum advance device.
What happens when fuel is ignited at the same 10 degree timing?
As the engine rpm increases to 3,000 rpm, the fuel, — still requiring the same time to burn — would never have sufficient time to burn if ignited at the same 10-degree timing. In order to have the same result, the fuel must be ignited much sooner in the compression stroke.