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Originally Posted by jeffd
BTW - the evans coolant doesn't boil and doesn't expand - but it doesn't transfer heat as well as water either... You can run a lower pressure cap and it does make the cooling system less prone to failure. However, the engine temp may be hotter when running evans and it wouldn't be apparent to you.
jeff
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Evans coolant does expand quite a bit. Adequate expansion space needs to be provided.
Evans coolant will boil at high temps (375F for NPG+ and 400F for NPGR).
With Evans coolant, the engine temp will run a slightly hotter under normal operation. Where Evans works much better than conventional coolants is when you get hot enough to boil conventional coolants and create steam pockets. The steam pockets act like insulators and reduce cooling system heat transfer. Evans coolant remains a liquid at the high temps continuing to provide effective liquid cooling.