X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 23 Jul 2007 07:21:31 -0400 Message-ID: X-Original-Return-Path: Received: from [64.12.137.3] (HELO imo-m22.mail.aol.com) by logan.com (CommuniGate Pro SMTP 5.1.10) with ESMTP id 2192567 for lml@lancaironline.net; Sun, 22 Jul 2007 08:21:44 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.137.3; envelope-from=Sky2high@aol.com Received: from Sky2high@aol.com by imo-m22.mx.aol.com (mail_out_v38_r9.2.) id q.d65.ced2dc7 (58435) for ; Sun, 22 Jul 2007 08:21:03 -0400 (EDT) From: Sky2high@aol.com X-Original-Message-ID: X-Original-Date: Sun, 22 Jul 2007 08:21:02 EDT Subject: Re: [LML] Oil Temps X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1185106862" X-Mailer: 9.0 Security Edition for Windows sub 5365 X-Spam-Flag: NO -------------------------------1185106862 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 7/22/2007 7:05:48 A.M. Central Daylight Time, douglasbrunner@earthlink.net writes: 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. * Is this top limit of 240 based on engine issues or on oil issues? * If the cylinder head temperatures are normal, does having an oil temp above 240 hurt the engine? * Does having an oil temp above 240 cause the oil to break down or los e 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 for a short period of time? * 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, Oil temperature indications depend on where the temperature sensor is located. One might say that it would be preferable that somewhere in the engine the oil temp exceeds 212F when operating at sea level so that H20 would boil off. The best answer is that the acceptable oil temperature range is listed in the engine operating manual. Scott Krueger AKA Grayhawk Lancair N92EX IO320 SB 89/96 Aurora, IL (KARR) Darwinian culling phrase: Watch This! ************************************** Get a sneak peek of the all-new AOL at http://discover.aol.com/memed/aolcom30tour -------------------------------1185106862 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable
In a message dated 7/22/2007 7:05:48 A.M. Central Daylight Time,=20 douglasbrunner@earthlink.net writes:
<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size= =3D2>
Today, while in my car, I=20= 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 u= se a=20 multigrade synthetic oil in my car.)  This made me wonder why the nor= mal=20 oil temp range in airplane engines top limit is 240.
  • Is this top limit of 240 based on engine= issues=20 or on oil issues?=20
  • If the cylinder head temperatures are no= rmal,=20 does having an oil temp above 240 hurt the engine?=20
  • Does having an oil temp above 240 cause=20= the oil=20 to break down or lose some of its properties?=20
  • Was this limit set at a time when oils=20 were formulated differently than today?=20
  • What harm is there in exceeding an oil t= emp of=20 240 for a short period of time?=20
  • What about a long period of time?=
I am not planning to set up my engine and= =20 baffling so that I routinely exceed 240, but have had the experience in my= =20 current plane (Mooney Ovation) of exceeding 240 while idling on the ground= in=20 hot weather.  Just wondered how much of a problem this really=20 is
Doug,
 
Oil temperature indications depend on where the temperature sensor is=20 located.  One might say that it would be preferable that somewhere in t= he=20 engine the oil temp exceeds 212F when operating at sea level so that H2= 0=20 would boil off.
 
The best answer is that the acceptable oil temperature range is listed=20= in=20 the engine operating manual.=20
 
Scott Krueger=20 AKA Grayhawk
Lancair N92EX IO320 SB 89/96
Aurora, IL=20 (KARR)

Darwinian culling phrase: Watch=20 This!



Get a s= neak peek of the all-new AOL.com.=
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