[Sailfish]

Increasing the flow rate of the coolant may not help in reducing the temperature of the coolant. Too slow of a flow rate will allow too much heat to be transferred and too fast a flow rate will not allow enough time for the metal to transfer heat to the coolant.

Think of it this way-------if you have a bed of hot charcoal and you walk across, you'll get burned. However, if you run across it can be done without getting burned. It's all a function of heat transfer.

In a nutshell, I wouldn't change the pulley until the system was professionally evaluated to ensure optimization.