Posted by tom upton on August 01, 2014 at 16:35:08 from (24.137.37.68):
In Reply to: Some pulley math posted by Notjustair on August 01, 2014 at 10:22:15:
output rpm = input rpm x drive over driven. so if your engine rpm is 3500 x(4/3.25) = 4308 rpm v/s 3500 rpm if pulleys where same size so 808 rpm faster or 23%. Idealy the larger dia pulleys would be better from a belt wrap/slippage perspective, but that is not to say 3.25 wont work? Also od of pulleys are not what you use to calculate exact rpm, it is the "pitch dia" but for all intensive purposes in your case OD is close enuff
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