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Old 03-21-2008, 04:35 PM   #11 (permalink)
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He's talking optimum piston speed not RPM. Some of the largest engines in the world the optimum RPM is 100 RPM and our car engines wont even run that slow. The reason our car engines have a sweet spot is cam timming and port size and length. I dont know maybe piston speed plays a role as well, its never occured to me though.

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