Quote Originally Posted by Greg Gauper View Post
The only reason to slow down the speed of the water pump is to reduce cavitation....period! It's a band-aid.
The other reason is because you have a good enough heat exchanger, and good enough airflow management to not NEED as much flow - so you slow it down to reduce parasitic losses, and free .5hp to get to the wheels.

I run a much smaller crank pully, and somwhat larger water pump pully. My water temperatures stays right at 180 in almost all conditions. My oil cooler holds temps at 220 consistently. I don't know why folks shy away from proper air ducting here - it takes $25 of parts from Home Racing Depot and a day to make it right.