FYI;
A 1:1 mixture of ethylene glycol based anti-freeze and water raises the boiling point of coolant to 225 degrees, from 212 of straight water.
A 15 psi coolant system in turn raises that same coolant boiling point to 265 degrees.
Above those temps the coolant can't cool the engine any longer because the boiling (bubbles) actually insulates the coolant from the metal surface (cylinder) and engine temperature then raises (fast!) to the melting point of the pistons.
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Sadly on the outside looking in.
"Drive it like the Doctor ordered"
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