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OK,
Dave. If that makes sense, explain this.... :)
After start-up - 29 psi (24 psi
cap)
Run-up 25
PSI
Two trips around the pattern - zero
PSI the entire time
third downwind - 8
PSI.
taxi back to hangar - 10
PSI.
After cool down - coolant still full
to the brim.
I'd
blame the instrument if I didnt have two of them.
and
no, I don't have a thermostat.
John
On 6/24/05, Ed
Anderson <eanderson@carolina.rr.com>
wrote:
Al, all I can tell you is that the pressure
would go immediately (within 2 seconds) to 21-24 psi. Then
as the engine warmed up the pressure would drop to a nominal 8 psi or
so. It seem likely that the pressure sensor was responding to small
variations in the coolant volume. But, certainly open to another
explanation. It was not coolant/combustion chamber leaks of that much
I am certain. Tracy found the same thing, have not heard any other
similar reports until John Slade mention his coolant pressure build up.
Ed
It makes sense to me Ed. Heat the coolant just a little, and it
needs to expand just a little. In order for any of the coolant to flow
out past the cap (even just a little coolant), it must reach the pressure
rating of the cap.
Once the engine is warm, there is no longer any need for the coolant to
leave so it does not reach the full rated pressure of the cap.
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