I flew for several years with the stock 13lb cap. I did have a minor
boil over once at 16,000 ft when climbing WOT at low speed (trying to
out-climb a storm front). Smelled the sweet smell of coolant and backed
off and all was well but that prompted a change to a higher pressure cap.
Coolant boiling point of 260F is at sea level since the cap is a gauge
pressure (relative to ambient) not absolute. Absolute pressure determines
boiling point. I haven't done the math to determine how much lower it
would be at 16,000 ft.
Tracy
----- Original Message -----
Sent: Friday, March 16, 2007 10:44
PM
Subject: [FlyRotary] pressure caps
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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