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This is a quote:
"The size of the bore does not affect the volumetric efficiency, assuming the valves are properly sized. The big factor with regards to the stroke is not the length of the stroke, but the piston speed (because the inlet Mach index is proportional to piston speed). An engine with a short stroke running at high rpm can have the same piston speed, and thus similar performance, to a long stroke running at a low rpm."
so there!
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