Quote:
Originally Posted by Frank Lee
I think as concerning fuel efficiency, we want to look at average piston speeds.
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Is there a more accurate predictor than piston speed? Assuming relatively constant VE/RPM. I don't quite understand why piston speed alone is a factor, but I could understand that there is an optimal rate of expansion for the combustion gasses, and that the combustion chamber should not overly retard, or outrun the expanding gasses, or mimize the discrepancy anyway. So that it would be a function of bore*stroke or something.