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post #5 of Old 02-18-2009 Thread Starter
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Pulley sizes

One problem is that my alternator works fine on the bench but not on the boat because of the slow Engine RPM. (When at low low idle I can actually count the belt RPMs as the belt revolves! ) The pulled on the alternator is 2.5" and the engine pulley is 3.5" If I went to a 2" pulley on the alternator and a 5" pulley on the engine would that help? There are 2 belts on the engine. One belt drives the alternator and the other drives the 2 water pumps. If I increase the size of the engine pulley, would it damage the water pumps by making them spin too fast?

Any suggestions on where to find a 2" pulley for the new alternator?

My alternator has 2 feet. Can I use a single footed one like this one from JC Whitney? MARINE ALTERNATOR : JC Whitney: Auto Parts & Accessories

Thanks for your help.

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