PS Pulley
FTE Legend
Joined: Nov 2015
Posts: 30,935
Likes: 4,123
From: Angier, NC
The 5.75 inch pulley will turn the pump 9% slower compared to the 5.25 inch pulley on the pump. So pick any rpm, say 1000 rpm. Multiply 1000 x .09 = 90rpm slower. So with the larger pulley, it will be turning 910rpm instead of 1000 rpm. That is nothing to do with the crankshaft speed, just a pump speed comparison.
Dave ----
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