Return-Path: Received: from smtp13.bellglobal.com ([204.101.251.52]) by ns1.olsusa.com (Post.Office MTA v3.5.3 release 223 ID# 0-64832U3500L350S0V35) with ESMTP id com for ; Mon, 20 Mar 2000 09:04:09 -0500 Received: from laurentian (Toronto-ppp55044.sympatico.ca [209.226.230.77]) by smtp13.bellglobal.com (8.8.5/8.8.5) with SMTP id JAA03998 for ; Mon, 20 Mar 2000 09:04:18 -0500 (EST) From: "Gary Rodgers" To: "Lancair List" Subject: oil cooler/temp Date: Mon, 20 Mar 2000 09:09:52 -0500 Message-ID: Importance: Normal Mime-Version: 1.0 X-Mailing-List: lancair.list@olsusa.com <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> >> Bob; I’m sure that different engine/oil cooler designs affect how much the cold air affects the cooler. +10F air at standard density isn’t really that cold for a lot of North America. I know that in my C182, without the baffle in place, on several occasions the oil congealed to the point that pressure relief bypassed the cooler, engine oil temperature went high enough that my prop governor stopped functioning, and I was concerned enough about the oil temperature that I slowed the plane up to nearly ‘slow flight’ conditions. After a period of 15-20 minutes, the heat transfer from the engine/cooler mounting warmed up the congealed oil in the cooler enough that it started to flow again and restored my prop governor operation and oil temperatures. The engine in the C182 was a 470 Continental, and not sure but assume there was a temperature sensing flow control also. The point is that at low temperatures, the minimum flow rate as permitted by a thermostatic device may not be high enough to keep the engine oil from congealing in the oil cooler unless there is some restriction to the amount of cold air passing through the coils. Regarding temperatures, I often started out with an ‘on the ground air density temperature of –25 to –30F. That’s why the need for baffles is not geographically universal. I’m sure that north and west of where Scott lives, they can also experience similar conditions. Gary >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> 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. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>