Davies Graig Electric Water Pump and Thermostat, Anybody used one?

**OnAll-FOUR** · 15-09-2010, 12:26 PM

Originally Posted by PRIMRK

Yeh...I'd like to believe it will work how they say it will buuuutttt.... im also going to be running a larger/more efficiant radiator and some others have said that they run too cool so im not realy sure. I mean if i hook it up and it runs too cool/ dosnt work how they said it would i guess i can return it...maybe...

How could it run too cool with a correct thermostat or a electronic controller pump? I think this comes back to where you measure your temps and where your trying to control them.

Option 1 : If you measure the temp at the radiator exit (as most factory termos are) then you are measuring how well your radiator is working and you will be regulating the temperature that enters the engine. For a regulated temp entering the engine, the output temperature will fluctuate depending on the heat that the engine is producing. The water entering the engine should never be too cool, but the water exiting may be very hot if your engine is producing a lot of heat.

Option 2: If you use the ECU measured temp (from the water neck) you get the hot measurement and this gives a measure of how much heat your engine is producing and you will control the final temperature. If you engine is producing too much heat, it will try reduce the temp of the water entering the engine (increase flow / turn on thermos) to compensate. This is when you might run too cool because this is the only way it can reduce the final operating temp of the engine, and I would argue that this is not the right way to do it.