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Well the Davies Craig system
Which they claim is suitable for up to 3L car. Uses a pump that is 13V 7.5A about 100W
This pumps 20gpm (no head)
Throw in alternator loss and the mechanical power the electrical pump would absorb is maybe 300W call it 1/2 hp
These guy claim that the water pump is dimensioned for the worst case which they say is idle where there is low flow from the pump. Such a pump has way way too much flow at hiway rpm and so causes loss.
So kind of the same argument as the grill block.
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