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I thought the 320 and 360 had a thermal valve that metered oil to the oil cooler. Doesn't this valve stop the oil flow to the oil cooler when the oil temp is below a certain value preventing too much cool air through the oil cooler from being a problem?
Mike -
I had the same question as you three years ago. There's an expensive little device known as a Vernitherm in your
engine. I also thought it's purpose is to maintain a minimum oil temperature
by opening and closing as necessary to restrict oil flow through the oil
cooler, similar to the radiator thermostat in your automobile. I don't know
what the Vernitherm does, but it doesn't maintain a minimum oil temperature.
I found that out when I started flying and my oil temperatures would not go
above 160 degrees, even during repeated touch and go's during a warm day. I
then installed a pilot-adjustable throttle in my oil cooler air intake and
now have complete temperature control.
I couldn't even get an answer from Don George as to why the
Vernitherm doesn't maintain a minimum oil temperature. If you don't install a system to throttle air flow to your oil
cooler, you're in for a surprise.
Bill Rumburg
N403WR (Sonic bOOm)
LML website: http://www.olsusa.com/Users/Mkaye/maillist.html
Builders' Bookstore: http://www.buildersbooks.com/lancair
Please send your photos and drawings to marvkaye@olsusa.com.
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