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Old 08-02-2017, 10:07 AM   #11
Cliff Pountney
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Join Date: Jan 2015
Posts: 39
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Gents,
I've worked in cooling system design for Ford for a long time. We've looked at alternative cooling fluids for all sorts of products from high performance to trucks to budget cars and our conclusion has always been that the best fluid is 40% OAT coolant and 60% water which is what pretty much every OEM uses.
Car cooling systems are usually (but not always) limited by the ability to get the heat from the radiator material into the airstream and not by getting the heat transfer ability of the coolant. 40/60 coolant has a specific heat capacity of 3.6kJ/kg/degC which is actually worse than plain water at around 4.2 but better than a light oil like ATF at about 2.8.
It'll be interesting to see how you get on but I suspect all that will happen is you will end up being able to run hotter.
Best wishes,
Cliff
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