Thread: Thermo Fans & Electric water pumps

In my experience, the rover cooling system is maginal for the v8's.

I think you would have cooling problems. Also I would be worried about depending on the electric water pump if I was in a remote area - I assume you will have removed the guts of your stock water pump to save power.

If I wanted more power I would look somewhere else, not at the engine cooling system. Just my opinion.

A viscous fan should de-couple when the engine is not too hot, therefore saving power. When it locks it pushes much more air than electrics. Look at any modern car with electric fans and they usually run very thin radiators to let the air through easily. 5 core radiators are not e-fan friendly.

Belt driven water pumps do a premium job of keeping engine temperatures the same throughout the block, by circulating even when the thermostat is closed, via the bypass hoses. This saves on head gasket failures. I have seen head gaskets fail from people blocking the bypass pipe, causing temperature differences across the engine.

An e-pump would take a little time to react to a temperature rise at the sensor, in the mean time the back of the block is getting hot.

Also you need to drive electric pumps/fans with a bigger alternator load, you don't get something for nothing.

Was toying with idea of doing same but once I got into the detail I left well alone. Even in the hottest (42degC) environment the current standard set up (MY1999/2000 Bosch 4.6) of viscous coupled fan plus electric ancillaries for aircon does excellent job...

Getting rid of all the excess weight for local travelling did wonders for performance/economy...

Was recently asked " a trip to the local shops does not require all the bits and pieces ...or are you actually leaving for Cape york right now?...
..I explained it was a "bloke thing"

Originally Posted by Rushy

Has anyone had any experience with electric fans especially in conjunction with an electric water pump, especially on V8's, I am interested in power gains and noise reduction, fuel economy is a secondary concern. Let's face it, if we were worried about economy we wouldn't drive V8's.

Cheers

Hi,

Do a search, there is plenty of recent info about installing thermo's and why people do it. Power gain and economy are not generally why, it's more about better cooling in hot conditions in traffic or crawling around in the scrub.

There's a guy on OL trying to integrate thermo's and an electric pump through an ecu, for info.

cheers, DL

the electric fans can work well enough I havent seen the electric water pump on anything yet....

go with the viscus you can fix that in the field if you need to.

The new model BMWs have an electric water pump.
Regard sPhilip A

Originally Posted by PhilipA

The new model BMWs have an electric water pump.
Regard sPhilip A

And when it fails how much will a new one be?

I would think "A LOT", seeing M3 brake pads are $450, and so is a headlight glass.

Regard sPhilip A