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Originally Posted by 440GP69
larger w-pump pulley will spin the w-pump faster as long as the crank pulley wasn't changed to a smaller size
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No, that's backwards (I know it gets confusing). Think of a bicycle derailleur -- large sprocket on the front and small sprocket on the back make the rear wheel spin faster for a given pedal speed.
Basically it's a ratio of the pulley diameters. An alternator spins much faster than crankshaft speed, and look how small its pulley is.