Does using a smaller upper pulley or larger crank pulley require that I install a larger alternator pulley to under drive my alternator?
First, you need to understand that the upper pulley is a driven pulley and the lower crank pulley is a drive pulley. The only accessory driven by the blower belt is the alternator. Changing the upper pulley has no affect whatsoever on the alternator’s driven speed. The only time you have to worry about that is when you change the drive speed when you change the lower crank pulley. So if you change to a larger lower crank pulley it is recommended that you install a larger alternator pulley to offset the increase in speed from the larger lower crank pulley. The stock alternator pulley is 2.6″. The most common upgrades are a 3.2″ for a 4 lb. lower and a 3.5″ for a 6 lb. lower.
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