X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sun, 22 Jul 2007 08:05:35 -0400 Message-ID: X-Original-Return-Path: Received: from elasmtp-banded.atl.sa.earthlink.net ([209.86.89.70] verified) by logan.com (CommuniGate Pro SMTP 5.1.10) with ESMTP id 2191956 for lml@lancaironline.net; Sat, 21 Jul 2007 21:21:14 -0400 Received-SPF: none receiver=logan.com; client-ip=209.86.89.70; envelope-from=douglasbrunner@earthlink.net DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk20050327; d=earthlink.net; b=lxd8uEOj6XWgzcHoMx8HpflHoQK6ACcY1AHlp+beyf0SCh/JCPLY04kScjY5sKYW; h=Received:Message-ID:From:To:Subject:Date:MIME-Version:Content-Type:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE:X-ELNK-Trace:X-Originating-IP; Received: from [74.93.196.177] (helo=DFWK3391) by elasmtp-banded.atl.sa.earthlink.net with asmtp (Exim 4.34) id 1ICQ7h-0006EB-Ud for lml@lancaironline.net; Sat, 21 Jul 2007 21:20:38 -0400 X-Original-Message-ID: <000801c7cbfe$7c570d40$1bd0a60a@DFWK3391> From: "Douglas Brunner" X-Original-To: "Mailing List Lancair" Subject: Oil Temps X-Original-Date: Sat, 21 Jul 2007 21:20:24 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0005_01C7CBDC.F3A8FB50" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3138 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3138 X-ELNK-Trace: ad85a799c4f5de37c2eb1477c196d22294f5150ab1c16ac0c864d17e3813b99a3f7fc8d8c6097e76e1f6cd2a4b3eb6cc350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 74.93.196.177 This is a multi-part message in MIME format. ------=_NextPart_000_0005_01C7CBDC.F3A8FB50 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable There was a recent discussion on the LML about oil temps. Today, while in my car, I noticed that the normal oil temp range is 200 = to 250, the gauge goes as high as 300 - my engine was running with an = oil temp of about 225. (I use a multigrade synthetic oil in my car.) = This made me wonder why the normal oil temp range in airplane engines = top limit is 240.=20 a.. Is this top limit of 240 based on engine issues or on oil issues? b.. If the cylinder head temperatures are normal, does having an oil = temp above 240 hurt the engine? c.. Does having an oil temp above 240 cause the oil to break down or = lose some of its properties? d.. Was this limit set at a time when oils were formulated differently = than today? e.. What harm is there in exceeding an oil temp of 240 for a short = period of time? f.. What about a long period of time? I am not planning to set up my engine and baffling so that I routinely = exceed 240, but have had the experience in my current plane (Mooney = Ovation) of exceeding 240 while idling on the ground in hot weather. = Just wondered how much of a problem this really is Doug Brunner N241DB 90% complete - 25% to go ------=_NextPart_000_0005_01C7CBDC.F3A8FB50 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

There was a recent discussion on the = LML about oil=20 temps.

Today, while in my car, = I noticed=20 that the normal oil temp range is 200 to 250, the gauge goes as high as=20 300 - my engine was running with an oil temp of about 225. (I = use a=20 multigrade synthetic oil in my car.) This made me wonder why the = normal=20 oil temp range in airplane engines top limit is 240.

Is this top limit of 240 based on = engine issues or=20 on oil issues?
If the cylinder head temperatures are = normal, does=20 having an oil temp above 240 hurt the engine?
Does having an oil temp above 240 = cause the oil to=20 break down or lose some of its properties?
Was this limit set at a time when oils = were formulated differently than today?
What harm is there in exceeding an oil = temp of 240=20 for a short period of time?
What about a long period of = time?

I am not planning to set up my engine = and baffling=20 so that I routinely exceed 240, but have had the experience in my = current plane=20 (Mooney Ovation) of exceeding 240 while idling on the ground in hot=20 weather. Just wondered how much of a problem this really = is

Doug Brunner

N241DB

90% complete - 25% to = go

------=_NextPart_000_0005_01C7CBDC.F3A8FB50--