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Originally Posted by stephen wilson
Actually, there is at least one aftermarket electric water pump with an electronic controller that varies pump speed to control engine temperature, manufactured by Craig Davies.
I don't think any automotive manufacturer would lack the resources to design such a system. They manage to map fuel injection & ignition timing using dozens of sensors, over all possible operating conditions, while controlling emissions. Controlling a water pumps speed would be a piece of cake.
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We purchased one of these last year.. Problem is there is no way to efficiently route the water to/from the engine due to the OE water pump location.. There also isn't any place worth a damn to mount the electric unit.
The engine's design is the variable...