smaller pulley
11-19-2008, 05:27 PM
#1
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smaller pulley I'm a little confused about the over drive alt pulley. If an under drive crank pulley makes the alt spin slower then wouldn't you want a smaller alt pulley also? I thought the smaller pulley made it spin faster. Or is it the other way around?
11-19-2008, 06:13 PM
#2
Smaller "driven" pulleys result in higher revolutions at a given belt speed and require more force to turn the driven pulley. Larger driven pulleys result in lower revolutions at a given belt speed and require less force to turn the driven pulley.
11-19-2008, 07:50 PM
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OK so the overdrive pulley is actually smaller then stock and an underdrive pulley is bigger then stock? I'm so confused.
Last edited by CayenneRedV6; 11-19-2008 at 08:20 PM.
11-20-2008, 12:11 AM
#4
A smaller crank pulley will turn the accessories slower. The driven accessories work opposite. For example, a power steering pump or alternator will turn FASTER with a smaller pulley. Many companies offer a larger overdrive alternater pulley along with an underdrive crank pulley to keep the voltage from dropping.
