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I think people are misunderstanding vernatherms. I think that vernatherms work the opposite of an
automotive thermostat. The vernatherm gets longer as the oil temp goes up. This closes the oil
gallery that goes direct to the engine and forces the oil to go through the cooler. When the oil is
cold it can go either direction On my engine, enough the oil prefers to go through the cooler to
keep the oil temp needle from coming off the peg if temp is near freezing and I don't close my oil
cooler door.
I use the waste heat from the oil cooler to help heat the cockpit, so I like my oil temp to go as
high as possible, but I need to have some flow to force the air into the cockpit so I have about ½"
square hole in the door and that lowers my oil temp about 20° C if its cold.
Bill N7WB