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Chris, I have run with a 21-23 psi radiator cap for over
10 years with no adverse affects. Most caps use atmospheric pressure in
addition to spring/gasket to hold the pressure. Therefore as you increase
in altitude the contribution of the atmosphere to holding the pressure is
reduced. I know of a couple of incidents where folks were using 14 psi
caps and found that at altitude the cap would not hold against the cooling
pressure and they had fluid in their overflow recovery can. I personally
would not use less that a 21 psi cap. Others may offer different
suggestions - but that is my experience. I probably would not normally go
above 25 psi cap - but if a 29 psi cap was all I had, I would not hesitate to
use it.
Theoretically if you maintain too high a pressure in the
system then you could cause leaks around pump seals and else where - but, if the
pressure gets that high you undoubtedly have other problems
{:>)
Ed
Sent: Monday, September 13, 2010 6:56 AM
Subject: [FlyRotary] Radiator cap - system
pressure
Gents,
What pressure caps are you running with? What maximum
should be used? I currently have a 16 lb cap, but have found ones up to 29
– 31 lbs. I know more pressure means more cooling, but is there a maximum
limit before hurting the engine?
Chris
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