[Bob Bidonde]

Up to now, I have been using a 50% Volumetric Efficiency in my calculations for the Models "A" & "B" engines. I suspect it is actually lower. For those who are wondering what volumetric efficiency is, a 100% would mean that each cylinder would intake 50 cubic inches of fuel (fuel intake = 100% of displacement).

What volumetric efficiency do you engineering & inventive types use? I am guessing I should use 40%????