Dave Barlow
Active Member
Does anyone have experience of Evans Cooling products, particularly with an intercooled supercharger?
Waterless Cooling
- Thread starter Dave Barlow
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- cooling supercharger waterless
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- E55K SL500 E250X2 Smart44 Brabus Track car E450Cabriolet X350 Pick up
I have used it in my split cooling system on a E55
french
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A few people used it on TVR's with good results, it has a higher viscosity than water, I thought it may put extra strain on the water pump this put me off using it...well its not cheap either.
hotrodder
Active Member
Personally i wouldn't use that overpriced treacle if i was paid to...
Evans quote a specific heat capacity of 0.66 BTU/lb http://contrails.free.fr/temp/NPG+_MSDS.PDF which is about 2/3 that of straight water. Obviously water has a few drawbacks related to it's relatively high freezing point, low boiling point and corrosion hence mixing it with a glycol and some corrosion inhibitors.
The reason why all car manufacturers specifically warn against running more than 50 - 55% 'antifreeze' in water is because increasing the glycol % lowers the heat capacity, the following links have various tables showing the heat capacity, viscosity and a bunch of other stuff at different glycol strengths...
Liquid Water Properties at different Pressures
Ethylene Glycol Heat-Transfer Fluid
Propylene Glycol based Heat-Transfer Fluids
While the Evans snake oil may not boil* it doesn't raise tha max running temperature of the cylinder head or the engine oil. As it almost certainly raises the normal operating temp a little you spend a fortune (no water remember so need twice as much 'coolant') to end up with an engine that has a narrower operating temp range
If you get a small coolant leak while out and about you can't top up with water and carry on without wrecking your stupidly expensive 'coolant'
* at least until 375°F (190ish °C), note how similar that number is to the boiling points of neat ethylene and propylene glycol, similar deal with viscosity, specific gravity etc...
Evans quote a specific heat capacity of 0.66 BTU/lb http://contrails.free.fr/temp/NPG+_MSDS.PDF which is about 2/3 that of straight water. Obviously water has a few drawbacks related to it's relatively high freezing point, low boiling point and corrosion hence mixing it with a glycol and some corrosion inhibitors.
The reason why all car manufacturers specifically warn against running more than 50 - 55% 'antifreeze' in water is because increasing the glycol % lowers the heat capacity, the following links have various tables showing the heat capacity, viscosity and a bunch of other stuff at different glycol strengths...
Liquid Water Properties at different Pressures
Ethylene Glycol Heat-Transfer Fluid
Propylene Glycol based Heat-Transfer Fluids
While the Evans snake oil may not boil* it doesn't raise tha max running temperature of the cylinder head or the engine oil. As it almost certainly raises the normal operating temp a little you spend a fortune (no water remember so need twice as much 'coolant') to end up with an engine that has a narrower operating temp range
If you get a small coolant leak while out and about you can't top up with water and carry on without wrecking your stupidly expensive 'coolant'* at least until 375°F (190ish °C), note how similar that number is to the boiling points of neat ethylene and propylene glycol, similar deal with viscosity, specific gravity etc...
Marku
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Thought of using it in my 450SE as it runs at a higher temperature, is not pressurised and is non-corrosive. Also claims to have no 'cool spots'. It is very expensive but has some real positive gains as far as I have learned and is ideal for very much older engines. Did post this very question on the forum some time ago and got some very detailed answers Try a search it should come up with it.
