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Old 07-28-2007, 03:58 AM   #1
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Default What about an electric water pump ?

With all this talk of coolant reroute and the obvious benefits of it bar the hard and tricky install (removal of components to do it - ie pull head or pull entire engine unless you got rubber fingers)

Would it be easier and simpler to place an electric water pump in one of the lines to the radiator and use extra flow vs front of the head back of the head ? Has anyone done this ? or thought of this before ?
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Old 07-28-2007, 10:32 AM   #2
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Other car companies do it with water and power steering I believe.

I'd think the electrical system didnt have enough headroom for it but I could be wrong.
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Old 07-28-2007, 10:34 AM   #3
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how about a slightly better flowing electric wate pump as a stand alone how many amps do those pull anyway?
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Old 07-28-2007, 04:16 PM   #4
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judging by the cables goign to the one I have - the basic one - they dont use much power at all ! you can also get an upgraded controller that varies the speed of the pump to the water temp and by doing so they act as an electrical thermostat - at low temps they operate slowly and at higher temps they go full speed !

http://www.daviescraig.com.au/main/display.asp?pid=47
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Old 07-28-2007, 04:19 PM   #5
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The bottleneck in my car's cooling is airflow, not water flow. With Evans, massive built-in-shroud'ed Spals and a very high fin density radiator, the coolant temperature drop across the radiator at high RPM was < 10C, and the air temp drop across the radiator was huge at 50C. This says that the airflow through the radiator was weak. If you could double coolant flow the 10C delta may reduce to 5C netting you a ~3C improvement in engine outlet coolant temps. Not much.

The electric water pump idea is nice IF you do reverse flow (coolant goes through head first), because this would reduce head temps and detonation.

However if you look at GM patent (which Evans contested), there are issues with using water based coolant (steam bubbles go up and get trapped or something like that) in reverse flow, which GM got around by designing the coolant passages in the head differently. Using Evans coolant gets around the problem by way of its very high boiling point (i.e. no steam bubbles form to begin with).
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Old 07-28-2007, 04:20 PM   #6
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3barboost if you use its speed to control temperature, you will get no coolant flow through the heater during warmup, so you need a small aux pump in the heater circuit that turns on when you turn the heater on.
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