Return-Path: Received: from smtp11.bellglobal.com ([204.101.251.53]) by ns1.olsusa.com (Post.Office MTA v3.5.3 release 223 ID# 0-64832U3500L350S0V35) with ESMTP id com for ; Sat, 18 Mar 2000 17:50:43 -0500 Received: from laurentian (ppp4593.on.bellglobal.com [206.172.211.177]) by smtp11.bellglobal.com (8.8.5/8.8.5) with SMTP id RAA26679 for ; Sat, 18 Mar 2000 17:53:17 -0500 (EST) From: "Gary Rodgers" To: "Lancair List" Subject: oiler cooler thermostatic valves Date: Sat, 18 Mar 2000 17:55:29 -0500 Message-ID: Importance: Normal Mime-Version: 1.0 X-Mailing-List: lancair.list@olsusa.com <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> >> Bob- Can I mention one problem, that probably only shows up in northern climes? Unrestricted cold air flow to an oil cooler can cause the oil to build in viscosity to the point of causing the bypass, even though the engine oil temperature is calling for cooling. Then the engine oil can then overheat, and even cause problems with the prop governor, if you have a variable pitch prop. If the oil is too thin to maintain pressure in the prop governor, you can have a prop that cannot be controlled; unless you have a counterweighted prop in which case it will by default go to fine pitch. Fine pitch is much much better than a prop going to maximum course pitch. The first plane I owned was a C182; that's where I learned about oil cooler airflow restriction needed in the winter. It is better to have some oil passing through the cooler at all times because if the oil flow does stop by a thermostatic bypass, and the air is very cold, then it may be impossible to get it flowing again until you are on the ground and engine heat can migrate to the cooler and warm the oil to a point that the pressure relief valve is not relieving. I live in what is called "Northern Ontario", but if you look on a map, about in line with the north end of MI, and well south of the north western states, so I think there is a lot of country where this can be an issue. Gary Rodgers >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> 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. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>