Does anyone know the alternator pulley ratio? I just bought a HO Alternator from Ohio Gen and would like to know what it puts out at engine idle and max. I have the output in Alternator RPM's but have no idea what the relation is between engine RPM and alternator RPM. Thanks in advance.

 

After doing some research I think the crank pulley is around 6.3 inches and the alternator pulley is about 2 inches which would give a 3.15:1 ratio. That means I get a lot of output from this alternator at fairly low RPM's.