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Sorry
did not finish that before I hit enter.
As you
rotate past the intake port the compression chamber pressure goes from 0
to over a hundred psi, once the plug fires the pressure
skyrockets due to combustion. If you have a leak just past the intake port
then your coolant system might see a pressure of 4 or 6 psi. If the
leak occurs just before the plugs then you have a pulse of 100 psi potentially,
if the leak occurs 40 degrees after the plugs fire you have the potential
for a great deal of pressure pulsed to the cooling
system.
In a
piston engine you see maximum combustion pressure when you have a leak, it is
much easier to recognize.
--
Ian
-----Original Message-----
From:
Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On Behalf Of
Ian Dewhirst
Sent: Wednesday, June 08, 2005 11:10 PM
To:
Rotary motors in aircraft
Subject: [FlyRotary] Re: coolant
leak
Hi
David,
I
really really think that a cooling system that consumes coolant is
leaking it somewhere, either venting water vapor to the atmosphere or
leaking. I don't follow how your coolant level can
be going down and yet you still have residual
pressure, shouldn't the pressure drop to zero as the
coolant is consumed over time?
A
rotary is unique in that depending on where an o-ring failure occurs
relative to the intake port you can end up with a little problem or
a big problem. As you rotate past the intake port the compression
chamber pressure goes from 0 to over a hundred PSI, once the
plug fires the pressure skyrockets due to combustion.
--
Ian
If I were getting combustion pressure in my cooling system I think I
would be boiling off my coolant PDQ. But I find that it only drops
very slowly, about like in my car.
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