Re: Rod length? Piston speed?
I believe the thinking behind high rpm short rod motors is that the piston accelerates away from TDC faster which helps initiate intake flow plus you have the benefit of the lower piston / rod (rotating) weight. It appears to me this works well if you have adequate or more than adequate air flow but it’s my guess is that you need to keep these motors buzzing in a narrow RPM band.
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Bill Baer 3391 SC, 339B SC, QR
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