Electric water pump

[California98Civic]

Originally Posted by oil pan 4

I still say belt drive the water pump and do an alt delete.

I agree with this completely. The water pump is really critical to the survival of the engine. Add first take all the other parasitic draws off the engine. Power steering, alternator, air conditioner.

[teoman]

I see new cars having 2 pumps. One mechanical and one electric. Have they put the smallest pump possible and then use electric when needed?

[oldtamiyaphile]

Originally Posted by teoman

I see new cars having 2 pumps. One mechanical and one electric. Have they put the smallest pump possible and then use electric when needed?

The auxiliary pump is there to circulate coolant after shut down. The mechanical pump is variable so no need to boost it with an electric one.

[teoman]

They claim that it speeds up warmup time.

[ASV]

in my Tacoma truck I always wanted to move the radiator and the battery to the bed.
I had manual steering and it seemed that the lighter the front end the less effort I needed in the parking lot. it originally had power steering but the pump broke same with the ac
I think an electric water pump would have helped.
that was a stripped down truck

[dwtaylorpdx]

Davies Craig Electric pump + their PWM waterpump and fan controller..
Good stuff isn't cheap,,

[Piwoslaw]

Came accross a summary of a scientific paper (published in J. Eng. Gas Turbines Power. Jan 2007, 129(1): 239-244):
Application of Controllable Electric Coolant Pump for Fuel Economy and Cooling Performance Improvement
Haven't read the article, but here is the summary:

The engine cooling system for a typical class 3 pickup truck with a medium duty diesel engine was modeled with a commercial code, GT-Cool, in order to explore the benefit of a controllable electric pump on the cooling performance and the pump operation. As the first step, the cooling system model with a conventional mechanical coolant pump was validated with experimental data. After the model validation, the mechanical pump submodel was replaced with the electric pump submodel, and then the potential benefit of the electric pump on fuel economy was investigated with the simulation. Based on coolant flow analysis, a modified thermostat hysteresis was proposed to reduce the recirculating flow and the electric pump effort. It was also demonstrated that the radiator size could be reduced without any cooling performance penalty by replacing the mechanical pump with the electric pump. The predicted results indicate that the cooling system with the electric pump can dramatically reduce the pump power consumption during the FTP 74 driving schedule and that the radiator can be downsized by more than 27% of the original size, under the grade load condition.