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Old 07-22-2017, 02:52 PM   #1
TxSkyBolt
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Default Oil Cooler Duct

Unrelated to biplanes, but you all have such a wealth of experience. I am working on my garage project. It has a Revmaster 2100D engine. The oil cooler mounts on the bottom of the engine (see attached photo). The oil cooler already has a built in mounting bracket and sort of a plenum. My lower cowl has a slot for cool air to reach the oil cooler (see attached photo). I was wondering what I should do to ensure maximum cooling of the oil. The oil cooler has no openings or pass through's from top to bottom, so cooling air needs to go over the fins, top and bottom. I don’t fancy myself as a fabricator, so looking for a simple solution. Fire away!


Oil Cooler Picture.jpg   Oil+Cooler+Opening+in+Cowling.jpg  
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Old 07-22-2017, 05:34 PM   #2
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Sonerai?


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Old 07-22-2017, 05:42 PM   #3
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Thatcher

I think I would just extend the metal work from the cooler forward to within about 1/2" of the cowl opening and seal it with baffle material around the cowl opening.
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Old 07-22-2017, 06:15 PM   #4
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Neil,

Thanks. Should I build a shroud around the bottom of the cooler with a little space also?
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Old 07-22-2017, 06:34 PM   #5
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I don't think so. The air will force out through the bottom of the cooler and find it's way out back by the exhaust stacks.
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Old 07-22-2017, 07:23 PM   #6
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Neil,

Thanks again. I only ask again because there is no gaps in the cooler for the air to go from top to bottom...on
Y the short fins on top and bottom.
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Old 07-22-2017, 07:29 PM   #7
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So, you are saying air can not pass through this cooler?
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Old 07-22-2017, 07:36 PM   #8
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If this oil cooler relies on air passing over its surface, then you want the duct that it is in to force all air to flow very close to those surfaces. Say within 1/2". All other air is wasted and dumping it under the engine makes the engine cooling less efficient.

Not a good cooler for an airplane.

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Old 07-22-2017, 07:42 PM   #9
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Quote:
Originally Posted by PittsDriver68 View Post
If this oil cooler relies on air passing over its surface, then you want the duct that it is in to force all air to flow very close to those surfaces. Say within 1/2". All other air is wasted and dumping it under the engine makes the engine cooling less efficient.

Not a good cooler for an airplane.

Best of luck,

Wes
Agreed
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Old 07-22-2017, 10:34 PM   #10
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I now remember Thatcher. Because it is not flow through, it may be best used if the cooler was actually placed in a high pressure area as part of the skin. Part of the chin of the cowl below the oil pan slit maybe? My Alfa Romeo Spider was designed before front spoilers were used. There is a 7qt finned oilpan, the bottom of which catches the air flowing under the nose of the car.
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Old 07-22-2017, 10:40 PM   #11
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Some info here. http://www.sonerai.net/smf/index.php?topic=3249.0
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Old 08-12-2017, 02:16 AM   #12
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I left the oil cooler on top.
Molded the duct into the top cowling.
Carved a foam block and wrapped it with glass/epoxy.
Then dissolved the foam out (and smoothed the inside surface).
(Learned that 100 octane LL doesn't dessolve foam!)

Tacked the duct in place (all assembled) with super glue and baking soda.
Then glassed it in permanently.
Turned out okay.




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