Help With Intake Charge Speed

by Michael Forrest

I need help to determine what the intake charge speed from the transfers would be for a given crankcase pressure. If I figure that the speed is the same as the piston speed then I figure that the intake charge will reach the spark plug right when the spark happens (12 degrees BTDC @ 10ooorpm with horizontal transfer roof). But I think it gets there even faster because the intake charge is under pressure when the transfers open.

If you can, please help me figure this out.


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