Quote:
Originally Posted by t vago
This Hot Rod magazine article has a rather interesting take on electric water pumps.
Baseline Testing - Do Water Pumps Suck Power?
I gathered, from reading the article, that it might be best just to get an underdrive pulley.
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Good article. My take on it is that they're running the engine at full power, and that is where a mechanical pump would be the least efficient, at lower RPM the power to spin the pump would be less. Since ~93% of the time our engines are running at cruising speed, I don't think the parasitic drag from coolant flow is really all that great, and since an 8 amp current draw is only about 100 watts, 1/8th HP, I don't think we're talking about a very large load here at all.
This only supports my theory that it will be very difficult to see an efficiency gain from this.
Agreed that a larger pulley would be a way to see real gains, but the ability to cool the engine on the hottest of days may be compromised.