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Date: Sun, 10 Jun 2007 17:56:09 -0500
From: Dennis Haverlah <clouduster@austin.rr.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: RV-7A cooling - continued
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I've improved my cooling quite a bit by installing an insert in the 
bottom of the cowl to direct air up and into the oil and water 
radiators.  This took the place of  the vanes I had installed first.  
Attached is a picture taken looking into the air inlet duct showing the 
foam insert in the lower cowl/duct.  My last flight at  90 deg. OAT my 
oil went to 212 and the water went to 199 F.   This was at about 5200 
rpm, 23 in. mp and 115 kts.  My oil pressure was 65 psi.  I'm using 
Castrol Synthetic 10W-30.  On start-up my oil will go to 85 psi max. 
 From tests I've run, I now have more flow through the first 40 % of the 
radiators and less  flow through the rear 60 %.   I probably need to 
change the wedge shape to increase flow to the back of the radiators.  
I'd like to review the document  by Kays and London that covers design 
of a wedge.  Does anyone have information on how I can get this 
document?   Also does anyone know if the inner combustion "O" rings used 
in the Renesis engines are Teflon encapsulated from the factory?  I

Thanks,
Dennis H.