[RWebb]

ok, found it:


Flat fan (e.g. 935) required » 30 hp

a water pump consumes about 12 to 15 hp at 6000 rpm for a Chevy LS1 motor

On the VW Vanagon, the crank-driven fan required about 3.4 hp of the 67 maximum on the air-cooled motor, for a reduction of 5.1%. The water pump on the water-cooled motor, requires only 0.7 bhp of the total 82 hp, for a reduction of only 0.08%.

the VW info is from Rod & Truck, June 1985