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Good question, John
If the analysis is correct, it may indeed be better to have a small cushion of air at as an absorber. All of my coolant components take at least 250 psi (radiator cap and water pump seals excepted). The only concern I have with higher pressure is blowing out the seal around the water pump shaft - don't have any idea how much pressure that might take.
Ed
----- Original Message ----- From: "John Slade" <sladerj@bellsouth.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Sunday, June 26, 2005 9:07 AM
Subject: [FlyRotary] Re: Coolant Leak
So, would it be better to remove some coolant and HAVE a cushion of air, and
thereby reduce the pressure and stress on cooling system components? I have
a heater core up front. I'd hate to have it burst. Is it really seeing 20+
PSI when it was probably designed to take less?
John
>
> This may be related to Al Wicks reason for running with a cup of air
> trapped in his system, a buffer if you will.....Tim Andres
>
I do notice that after I have refilled the coolant system (and before the
air is all flushed out), that I do not get the immediate surge of
pressure
to 21-24 psi on start up. It will slowly climb to 8-12 psi depending on
power settings and airspeed. However, after several flights and the
system is purged of air this phenomena starts to occur. Again,
no coolant
leak associated with it. I suspect that with the air purged, that this
surge has to do with the coolant volumetric area. With no
cushion, then any
movement of coolant is likely to be sensed as a pressure increase
- once the
block has warmed up and coolant passages, etc, have warmed up (and
expanded), I think there is a slight increase in coolant passage
volume and
the pressure decrease as a results. Just a SWAG of course.
Ed A
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