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Originally Posted by rfishing
I still have my doubts about the cooling effects of just water as well. Perhaps if coolant were in there, perhaps it would not overflow? After all water boils at 204 up here, I have yet to find what a normal operating pressure would be inside norstar engine, so calculating exact boiling point is not possible. However, I did read about another engine says, normal is 7 PSI. If that held true with Norstar, then my boiling point would be 21 +204= 225. Provided it is boiling before pressure has chance to increase to 15psi relief pressure, that would explain why the temperature went up to 235 and I lost water out the overflow.
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Plain water cools better than coolant but, it has no lubrication, anti-corrsion or anti-freeze capabilities, thus we have to add coolant.
Your cooling system is sealed so the altitude you are operating at is irrelavent. It is under what ever pressure the cap is rated at (or less), assuming it is operating properly. The cap will simply vent off excess pressure once the 15 psi limit is reached.