How much power from intake swap?

MRL Performance said

We run an electric pump to circulate the water. I don't have the time or patients to get pulleys to line up, don't have very many any way. Its just easier for me when hooking them up. It not worth much, maybe 5HP on most stuff. He is running an electric motor to run the pump, not the crank.

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Mike is correct on the horsepower loss. When the belt flies off the crank and water pump pulleys on a 700 HP engine at 7,000 rpm you gain about 7 HP. Done watched that happen with my very own eyeballs.

Another interesting note. A loose belt that slips and flaps around will cost more horsepower than a tight one. Tested that on our dyno.

There is supposed to be an even greater loss when pulling a fan with the belt but I have not personally tested that one.