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Originally Posted by braverichard
Duke2.6,
I can understand your theories as they seem logical (proven with real examples you gave). However, why is it that once I re-filled my system with a 50/50 mixture of water/antifreeze it stopped overheating and started running at 80 C - 90 C? I thought the system was overheating because the boiling point of water is 100C and so once that temperature was reached, the water started boiling.
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Could be a combination of things - air pockets in the system or the pressure cap not installed. A 50/50 mix of glycol and water will boil at about 265F with a 15 psi cap. Straight water with a 15 psi cap will be lower - I think about 235.
The NASCAR guys use straight water with Water Wetter or a similar additive. The added thermal capacity of straight water helps cool those 750 HP engines. They like to run them hot because it makes for lower piston and ring friction. About 210 is ideal, and they pull tape of the grille if it gets up to 230, and I think they run 20+ psi caps, so the boiling point is probably 240-250.
Duke