> Steven Kwak Wrote:
> And if you were correct a two-stroke would be advancing timing as RPM
> went up.
> Two Strokes also use an expansion chamber which works is a supercharger
> the compression ratio changes.
> That also affects the speed of the burn.
NO. You don't seem to grasp the fact that at the moment of ignition IT'S A CLOSED METAL CYLINDER. The flame speed is a physical property of the fuel. Timing affects the compression ratio at the moment of ignition, Pv=NRT. It changes IF the fuel will ignite, NOT what happens to the flame once it does. I have no idea how you think the expansion pipe has anything to do with this? The exhaust port is CLOSED at the moment the fuel ignites. You can take the pipe off and mail it to China, a lean mixture still burns slower than a rich one.
You're just arguing with me because you want me to be wrong. Stop harassing me and try to learn something. READ THIS GUY:
"Mixture ratio: the A/F ratio has a very significant influence on the flame speed. The highest flame speed (minimum time for complete combustion) are obtained with richer mixture and the lowest flame speed (maximum time for complete combustion) are obtained with leaner mixture."
Or this guy:
"Now, for all of the fuels that I have studied, combustion is fastest just slightly fuel rich. "