Need correct crank pulley!!!! Any ideas?

6pk2goDemon said
Your best bet is to find a smaller water pump pulley along with a larger crank pulley so you can drive the water pump faster than the crank.

I'm using a 5 3/4" WP & a 7 1/4" crank. Your 2 pulley diameters when added together cannot exceed 13"....

Very good information, I didn't know about the max. diameters added up. thank you!