Quote Originally Posted by Mike P View Post
Without going into the why, think about it for a second and look a the size of a normal alternator pulley compared to the size of the crank pulley it's driven off of. The alternator would be being driven SLOWER on a direct drive setup.
Correct!

If you mounted it direct you would need a flexible coupling between the crank shaft and alternator shaft, and of course a custom mounting bracket for the alt. As far as speed goes you need to know what minimum speed the alt will produce 14.5 V at. Direct drive that might not occur until ~2000 rpm?

Kitz