Ok you got me on that technicality. Depends on the pulleys being used. I’m using CVF pulleys and the water pump pulley is 6.4” and their crank pulley I have is 6.4” (which is their high flow size, they have a smaller diameter under driven type crank pulley also) so when I rev’d my engine to say, 6400 rpm the Derale mechanical 6-blade spun to??? Yes, 6400 or as I said , engine rpm. I should have been more specific :)
