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Old 01-03-2013, 06:52 AM
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Electric Water Pumps

How many out there use an electric water pump? I have two vehicles with them, one w/o thermostat, and a DC variable speed control and one running full speed with a remote bypass thermostat. The one with a remote bypass thermostat allows the engine to fully warm up; despite the manufaturer's recommendation to remove the thermostat completely. I suspect it may deal with having a bypass or not. Both are Davies-Craig pumps.

I would like to hear what others have done and perhaps help those who are considering such a coversion make the right decision.

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Old 01-03-2013, 07:00 AM
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I would consider using an electric water pump if it made it easier to use a vacuum pump
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Old 01-03-2013, 07:51 AM
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Is your goal to fit an engine driven vac pump easier using the area normally taken up by the water pump? There are also quite a few electric vacuum pumps out there including many on factory vehicles in the boneyards for experimentation.
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Old 01-03-2013, 11:56 AM
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Yeah I have heard failure stories, but have had good luck w/ mine. The cars are strictly street driven. A Lotus Esprit Turbo and a 1st Gen Mazda RX-7 w/ the rotary. Most miles are on the Lotus and it has operated fine since I purchased the pump in 2004. It has been driven quite a bit and as often as possible in the winter, weather/salt permitting. It has no thermostat (runs way to cold), but w/ the success of the Mazda coming up to the proper temp and continually recirculating w/ the external bypass stat, I will fit one to the Lotus. No hot spots and I get great heat too.

Just found this from the website: (Note the pump is used w/ the Davies Craig controller)

"Question No. 9
Will the fitment of an Electric Water Pump be a drain on my electrical system?
The extra current is very little. About 90% of total motoring time the EWP will run at 10% of its maximum speed using about 2 amps. Being in nylon, the impeller can have aerofoil cross section and the tip clearances can be very small. A mechanical pump has to perform at 600 rpm and 6,000 rpm and it cannot be efficient at both these speeds and all speeds in between. Furthermore, as the power the pump requires to operate increases as the cube of the speed - when the mechanical pump is operating at the higher speeds, as it does, as a car passes through its gear range, its ‘robbing’ engine power in the order of 6 to 10kW. The EWP® which uses at maximum speed 9 amps x 13 volts gives 120 watts at say 30% efficiency from the alternator to hydraulic power means about 0.4 kW to drive the EWP®, when it does operate at full speed."
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