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.
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