V8 Cooling Problem

[Mike Kimball]

I know that I should probably be on a hot rod list for questions like this
but I also know there are people on this list that know about high
performance V8 engines. And it is on a Super Rebel after all. Anyway, when
I run the engine the temperature rises steadily over about a ten minute
period. The pressure starts rising about 5 minutes into the run. The
pressure continues to rise until reaching 16psi as the temp passes about
190-200 degrees and then my 16psi cap opens and coolant starts spewing out.
The temp continues to rise until I shut it down shortly thereafter. Any
idea why the pressure builds steadily and doesn't level off before reaching
16psi? I checked an auto supply manual at the local auto store and Chevy
350 equipped cars and trucks for decades have used 16psi caps or less except
for a rare 18psi application. There are only a couple of things different
about my installation versus a car/truck. My radiator is under the engine,
roughly horizontal. It's tilted about 30 degrees with the inlet and outlet
on the high side. I have no thermostat installed per Skip Jones' Chevy V8
aircraft conversion manual. The thermostat housing is taller than usual and
the cap mounts there.

Mike
044SR




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