I have been flying for almost ten years with the stock radiator cap.  It is at the highest location, and vents into a one quart gatorade bottle.

Has never had a coolant problem, has climbed to eighteen thousand feet.  Usually has a water temp at the 190 deg stock thermostat setting.

As I understand it, the twelve pounds of pressure raise the boiling point to 260 deg.




George Graham
Sarasota Florida
Mazda RX7 EZ

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