CVF already sells a serpentine pulley set that overdrives the water pump. I'm not sure what percentage though. I have the measurements written down somewhere.
On this pulley set the water pump pulley is 5.125 and the crank pulley is 6.25 so that is about 18% overdriven.
NOTE***** The measurements were taken by my friend so it may not be the exact diameters but he is within a 1/16 or so. I just want to be clear I didn’t measure them to verify the sizing but he is pretty good with a tape. So he is very close. And it sounds about right.
