Quote:
Originally Posted by funola
What does a 50/50 colant water mix boil at? My guess is somewhere between 275 to 350F. The engine has to get damaging hot to boil the coolant. Combustion gas into the head could boil the coolant locally where the 2 meet, pressurizing it and cause the cap to vent.
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A 50/50 mix of Zerex G-05 will boil at 139°C. with a 140 cap.
Note, however, that you cannot really approach this figure without some bubbles developing.
I would agree that the engine cannot overheat at 120°C. with this setup.