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MPPalmer(at)aol.com
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 Posted: Thu Jun 26, 2008 11:46 pm Post subject: Air in oil cooler |
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Upon reading my own post, I had one more thought to check on oil coolers. Is the cooler filling all the way up with oil?
I've seen various oil cooler installations and while I know some production aircraft mount the coolers horizontally, I've always wondered if an air bubble isn't trapped in there that never gets purged? If so, then you'd never be using the full capacity of the oil cooler. It seems to me a vertical, or nearly vertical installation would fill the cooler with oil and be self purging.
Then comes the question of which way to feed a vertical oil cooler. Some advocate having the oil input to the higher of the two oil inlets. I'm not sure why... maybe to avoid a dry start if there is air in the cooler? (Although on a Lycoming, the cooler is in a parallel circuit with the main engine oil circuit, so you're always getting some oil direct from the pump.)
I could be wrong about all that. But when it came time for us to plumb ours, I remember someone who seemed knowledgeable on the newsgroups recommend you filled the cooler from the bottom up. This made sense to me and I can envision oil purging air out of the cooler in normal operation. Our cooler is mounted about 30 degrees off vertical (it's the only place on the firewall I could make it fit) and I've always wondered if the top 2 inches wasn't filled with trapped air.
Someone should make a clear oil cooler for testing purposes! Of course, the goal is to have the oil cooler be filled 100% with oil so as to maximize heat exchange.
Mike Palmer <><
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Gas prices getting you down? Search AOL Autos for fuel-efficient used cars.
(http://autos.aol.com/used?ncid=aolaut00050000000007) [quote][b]
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Craymondw(at)aol.com
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| Posted: Fri Jun 27, 2008 6:04 am Post subject: Air in oil cooler |
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Go advice Mike, I bleed my oil cooler before before hooking up the outlet side.
Gas prices getting you down? Search AOL Autos for fuel-efficient used cars.
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