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Old 11-21-2012, 05:34 AM   #38
Alex323Ci
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Join Date: Jan 2005
Location: Huntington Beach -Surf City USA
Posts: 17,437
My Ride: M3 & 323Ci (sold)
Quote:
Originally Posted by RayPooley View Post
Surely, an underdrive pulley is considered to be an accessory pulley that is LARGER than the stock pulley. In other words, the belt has to travel further in order to turn the pulley through 360 degrees. For any given belt linear velocity you would expect fewer revs of the pulley for each belt cycle than with the stock belt ie: reduced RPM. Since the pump shaft is rigid, not geared, this would result in fewer revs of the vane inside the pump that is responsible for moving the coolant. Reducing flow. Not incresing flow. Yes?
Haha he's still looking for some crayons he hasn't eaten during nap time and a yellow note pad to take notes. "Dude you're going to fast..underdrive pulleys work how?..der duh".
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