John at Mazdatrix claims this is caused by a failed pressure
cap. Even in street cars. I am not so sure. It looks like
simple corrosion to me. In any event it would not hurt to
buy a pressure cap tester. Such a cheap device can be critical
to the cooling of your aircraft engine.

A pre flight cold cooling system pressure check using compressed air
would accomplish the same thing.

Paul Lamar

If this pitting is caused by a failed pressure cap, how did it fail? Did not
open with too high pressure or did not hold the pressure?
What did cause the pitting - too much pressure/high flow velocity - local
boiling/overheating/melting/vapor pockets imploding?

IF this would be of serious concern it will be very interesting to see how
those fair that will use Evans- 0 pressure coolant!
If it doesn't boil at ambient P, with some pressure on it, it should work
still better....
Dave (Leonard), didn't you plan to switch to Evans?

Thomas Jakits


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