Higher coolant pressure will naturally increase the risk of a leak due to
blown hose, loose clamp, radiator tank failure, etc. As in many of these
matters, it is the builders choice as to which potential problem is most
important.
BTW, I do recommend doing a system pressure test at annual inspection
time or after making any changes. I intentionally over-pressure the system
by 50% by hooking a regulated air pressure source to the overflow port on
the cap fitting.
I could be wrong but the likelihood of a blown rotor housing coolant seal
from coolant pressure is very low. If coolant pressure causes them to
leak there was a problem that needed to be addressed long before the leak
happened. Most coolant seal leaks happen at the inner seal which normally
have to seal combustion chamber pressure. Even 30 psi coolant
pressure is a very tiny fraction of that.
Tracy (still waiting on Bluemountain)
----- Original Message -----
Sent: Sunday, March 18, 2007 8:21
AM
Subject: [FlyRotary] Re: water boiling
point
My same thought, the higher pressure the better chance of leaks,
for the last 1400 hrs I have been running a 7 lb cap with no problem, I
normally run about 180 for water temp but do see 220 on a hard climb out on a
hot day and when at high altitude its usually so cold outside that cooling is
not an issue.
Ken Welter
Thanks for your reply Tracy!
I did a
google search on water boiling point. Coolant should be higher,
but
it seems that water boils at 183 degrees at 16,000 feet. But that
is with
no added pressure. I could not find the corrected number for the 12
psi cap.
I wonder how many blown rotor housing seals are due to
higher coolant pressure ?
George Graham
Sarasota
Florida
Mazda RX7 EZ
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