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Which coolant to use for EWP pumps;

Conventional engine cooling products such as water, with a water wetter and/or a glycol-based additive (sub zero) is a more economical and cost effective method and a Davies Craig electric water pump will give you a more efficient coolant flow because the operation of the EWP is not directly related to engine speed, rather and more accurately engine temperature.

In conjunction with the EWP/Fan Digital Controller, the control of the engine's cooling system has been improved, increasing engine power by eliminating the parasitic power losses associated with mechanical water pumps.

Commercially available heavy duty waterless coolant  (power cool ) has a viscosity of 2,3cp @ 100°c and the viscosity of water is 0,347 @ 82,2°c. This is quite significant and the overall life of the EWP will be shortened and performance (current) may be affected, as the waterless coolant may force the EWP's electric motor to draw more amps and may not allow the EWP to deliver the required movement to cool your engine satisfactorily under normal conditions.

Two other interesting points; a brand of waterless coolant advises users that an engine will run about 5-8°C warmer than conventional water-based coolants. Also, waterless refrigerant weighs 4,4 kg per US gallon and water weighs 3,8 kg per US gallon.

Furthermore, some engines experience higher coolant pressure and even cavitation under racing conditions when conventional mechanically driven water pumps are used and 'waterless' coolant products can be used under these conditions.

Davies Craig believes that the key benefits of efficient coolant flow will not be achieved using waterless coolant with an electric water pump.

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