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"Having a wax motor thermostat with fixed calibration smacks of hubris."
Forget I said that. It is just wrong.
First, I imply it is a wax motor because I haven't yet seen a piston device driven by expansion in a cap tube using a refrigerant in vapor state. No reason it couldn't be something non-waxy that I can think of.
And, I believe I got that "wax motor" terminology reading what I could find from Calorstat or Stant at some point. Certainly these are wax motor devices with no adjustability for the user and very specific temperatures.
In a 240 I can think of 5 non-electronic thermostats in use, if you count the oil temperature thermostat in the turbo cars.
Two with cap tubes and diaphgragm motors in the earlier AC with expansion valves and dial controls.
Piston types in the engine coolant and the airbox.
Oil temp thermostat:
Airbox:
"So far I've never seen one with a leak, just failure of the thermostat."
Now the leak I refer to is one that gets your right foot wet, not the leak of the thermostat. But this is just my luck, because I had read in these forums the Ranco valve seal was replaceable and seals were available. At one time anyhow. I just haven't had one to leak yet that I'd want to take apart.
But Roland's idea to reduce the volume in the cap tube to make up for the leak sounds like a great experiment. Need to provide a load to the piston, maybe from the spring in the Ranco valve.
Somehow I believe STEM could be more widely appealing if the engineering part would include a little reverse engineering. I've always loved taking things apart to see how they work. Man made things like Volvos, not frogs. The biologists (anatomists of yore) are way beyond me.
--
Art Benstein near Baltimore
GREAT TRUTHS THAT LITTLE CHILDREN HAVE LEARNED:
2) When your Mom is mad at your Dad, don't let her brush your hair.
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