A COOL CONCEPT

Replacing OEM water pumps with Electric Water Pumps

Australian auto cooling manufacturer, Davies Craig Pty Ltd, says the notion that Electric Water Pumps (EWP) are a ‘performance accessory only’ is a misleading characterisation.
The company has been producing remote-mounted Electric Water Pumps for the past twenty years. It explains Electric Water Pumps have been utilised in a variety of motorsports activities over this period and continue to attract high acclaim for their dominant engine cooling advantages.
What is not widely known is the universal use capability of remote-mounted Electric Water Pumps as a replacement part for the original mechanical water pump, says Davies Craig.
The existing water pump can be removed completely, or the impellor can be removed from the water pump housing, converted into an idler, or indeed left in place and used in conjunction with the EWP. 
To simplify the installation when the mechanical pump is removed, Direct Fit Adaptor Kits are available for some engines that free up valuable space and take weight off the front of the engine.
When used as an idler, the impeller from the OEM water pump is removed and the EWP is installed inline in the lower radiator hose. In this situation, Davies Craig says the user will gain all of the great benefits of using an EWP while retaining all the factory pulleys and belt configuration. The EWP can also be installed to operate along with the vehicle’s OEM water pump.

Davies Craig says its Electric Water Pumps are lightweight, compact, easy to install and may well be the answer for difficult-to-cool earlier model engines or modern configurations; stating that if it has a bottom radiator hose, a universal-fit EWP could hold the key to an engine overheating problem.
When the EWP with a LCD EWP/Fan Digital Controller is installed, engine temperature, pump speed and electric cooling fans are automatically regulated. Certainly, says Davies Craig, the interest the OEMs have in electric water pumps lends credence to the idea and it may be a cool concept to examine the objectives of installing an EWP to an engine’s cooling system.
As outlined earlier, Electric Water Pumps for automotive use have been available for several years and for the most part, they have been used in a variety of motorsport applications.
Electric Water Pumps are often used in drag racing, being manually switched on between passes to prevent heat soak. In some applications, an electric motor is used to spin the usually belt-driven style water pump to provide some further, though minimal, cooling on a race engine. Obviously, the emphasis with both methods is on reducing the engine’s parasitic power loss due to driving a mechanical water pump.
Davies Craig explains that an Electric Water Pump has a number of advantages over the engine-driven mechanical pump.

It states an EWP will increase power sent to the drive wheels because the power the mechanical pump absorbs from the engine increases dramatically with its speed: when the pump speed doubles from idle, say 600rpm to 1200rpm, the power it takes increases by eight times, then eight times going to 2400rpm and so on.
This extra power and torque released by disabling the mechanical pump now goes to the drive wheels. Additional benefits of an electric water pump are improved cooling capacity and fuel economy along with the elimination of engine heat soak after a hot engine shut down. Engine cooling is also improved with a EWP thanks to a higher flow rate at idle and low engine speeds when there is little or no ram air, and when the engine is switched off.
While some attempts have been made to use race-style electric water pumps on the street, the results have never been very satisfactory, but all that has changed, says Davies Craig.
It states Electric Water Pumps do have a place on street-driven cars and in fact, one car manufacturer began using Electric Water Pumps in 2007 and several other manufacturers are working on similar versions for inclusion in hybrid and electric vehicles.
Manufactured and sold in Australia, Davies Craig’s auto cooling products are now exported to every continent around the globe. The Davies Craig models have always been available as an aftermarket fitment, suitable for regular daily drive use, and over the last twenty years, the Davies Craig EWP product line up has expanded to include Nylon or Alloy EWP pumps from 80 litres (21 gal/min) to 150 litres (40 gal/min).

For more information, visit www.daviescraig.com.au