From: CHBAviation@aol.com
Message-ID: <86.bf4aed9.2871161f@aol.com>
Date: Sun, 1 Jul 2001 20:11:11 EDT
Subject: Re: Oil and lower cowl cooling?
To: lancair.list@olsusa.com
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Reply-To: lancair.list@olsusa.com

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It sounds like your cylinders are fine.  Outlet and inlet on the cowling are 
also fine.
The position on the firewall was originally designed for an O-235 engine.  It 
ran "OK" for an O-320 engine but does nothing for the IO-360.  The Lancair 
factory demo plane had a nacca scoop on about the 5 o'clock position on the 
cowling and scat tubing over the back of the engine to about the 8 o'clock 
position.  This worked pretty good.  Since then I've had GREAT resualsts with 
making a mounting plate off the firewall.  Run it parellel with the side of 
the cowling.  Place a naccap scoop, glassed to the colwing, right in front of 
the oil cooler.  Make a duct taking the air from the naccap scoop to the 
inside portion of the oil cooler.  This iwll force the air through the oil 
cooler.  Louvers, slits, etc., for the exit through the cowling.  This works 
really well.  When I did it I was a bit uncertain if this would be the entire 
fix so I installaled a larger oil cooler.  Now the IO-360 engine runs on a 90 
+ degree day between 185-near 200 degrees.  Winter months (located in CO) I 
have to put a restrictor plate in to get the temp up to 180 degrees. Since 
I've built my plane, I've done the same thing to several of my clients with 
the original oil cooler.  Temps are slightly higher but it works just fine.  
You may want to try on your plane for a quick fix to make the scat tubing 
from the oil cooler to the exit 1-2 sizes bigger.  This may help speed up the 
outake air.  

Good luck to you,
Chuck Brenner
CHB Aviation LLC 
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Please send your photos and drawings to marvkaye@olsusa.com.
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