Thanks Joe, I'll go with the lowest pressure Stant cap I can find!
(Better safe than sorry.) I have a large radiator, so presently don't have a fan planned (little/no power when pumping air for the shop), just going to mount the radiator outside and see how it goes. I would have liked to use a cast iron radiator, but there's none of them here in AZ.
Where/what are you using for a radiator overflow reservoir? I found a plastic one at NAPA, but that won't hold up outside here. What's your plan?
Since we are at the same stage of things: Have you figured out an auto shutdown mechanism?
I'd like to have shut down on over-temp and low oil at least. Later maybe add vibration and sound, since the shed is over a hill from the house site and I won't be able to hear it. Had been thinking about a thermal switch epoxy steel'ed to the water outlet pipe stub, actuating a solenoid controlled air cylinder to push off the fuel. Low oil seems tricky because of the splash lube. Vibration- maybe a couple mercury type switches.
Anyone solved the auto shutdown situation or some good ideas???
Bruce