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MG MGF Technical - Electric water pumps

Has anybody used the Davies Craig elctric water pumps in their MGF. Like an electric fan it would save some HP from the crank. They also sell as part of the assembly a electronic controller that modulates the voltage to the pump (and hence pump speed) according to need. It will also provide continuing pmupng after the engine is turned of to better dissipate the build up of heat.
david mottram

It has been "thought about", but there's "some doubt" both with the MGF and the Elise communities about whether "real power" would be liberated by disconnecting the belt-driven pump.

The lifetime of the electric pumps is also relatively short and I'm not sure I'd trust my cooling system exclusively to one.

It has come up before, so it'll be in the archives...

There are other ideas about moving the thermostat and rerouting the cooling system and I personally think that's a better way to go. (also see the archives!)


Neil.
Neil

David has hit the nail on the head about electric pump usage, there is some mileage in using an electric pump although not as a power saver. The K can suffer from local overheating on the exhaust side of the head when the engine is switched off. Since at this time the coolant is no longer circulating excess heat from the exhaust valves is no longer dumped effectively and there is local boiling of the coolant. Aprt from the percussive affect on the head surface this leads to annealing of the head and softening which in turn leads to gasket failure and scraps the head. This is especially prevalent if the engine is worked hard and then killed.

An electric pump used in addition to the mechanical one but run for 2-3 minutes after engine shutdown can cure this problem and it is well worth considering.

You could of course acheive a similar affect by allowing the engine to idle for 2-3 minutes before switch-off..

Dave
Dave Andrews

>You could of course acheive a similar affect by allowing the engine to idle for 2-3 minutes before switch-off..<

A very good point as I found out on the Nürburgring - about the only time I have 'worked the K hard' - and of course it upset Herr Track Official when the car spewed out coolant in the 'holding area' of the track.

Ted
Ted Newman

>>You could of course acheive a similar affect by allowing the engine to idle for 2-3 minutes before switch-off..<<

Very very sensible advice there, thanks David - and is the switch off procedure after every sprint I do: pootle back to paddock. Stop car, and allow to idle. Then, as the adrenaline shakes wear off, remove gloves and helmet and switch off engine... And relax... ;o)
Rob Bell

Sounds like car yoga:)
Mark Catterall

LOL- yeah, it is a bit like that Mark! ;o)
Rob Bell

This thread was discussed between 20/01/2003 and 21/01/2003

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