Thread: Engine Guru's, Help Me Understand Ignition Timing

yes, but it's still not a ton of variance (mechanical advance was only about 5* wasn't it?)

Originally Posted by archemedes

yes, but it's still not a ton of variance (mechanical advance was only about 5* wasn't it?)

when the engine is at 6000 rpm its a ton of variance remember the speed at which the mixture ignites is dep on the fuel quality (VOC's, rapid vaporization, R or M octane rating etc.
then you have to take into account the mixture...is it a homogenous mixture near the plug, has the cylinder fill event occured where fuel is actually near the cylinder walls or concentrated near the spark plug.

the big biys have been playing with wet flow benches for a while now...look at the huge jumps in cylinder head/port/chamber design in just the last 5 years