X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sat, 01 Mar 2008 11:53:57 -0500 Message-ID: X-Original-Return-Path: Received: from asp-3.reflexion.net ([205.237.99.178] verified) by logan.com (CommuniGate Pro SMTP 5.2.0) with SMTP id 2772531 for lml@lancaironline.net; Sat, 01 Mar 2008 11:01:01 -0500 Received-SPF: none receiver=logan.com; client-ip=205.237.99.178; envelope-from=cberland@systems3.net Received: by asp-3.reflexion.net (Reflexion email security v5.30.2) with SMTP; Sat, 01 Mar 2008 11:00:12 -0500 (EST) Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C87BB5.53131819" Subject: [LML] Oil Temps and Oil Doors X-MimeOLE: Produced By Microsoft Exchange V6.5 X-Original-Date: Sat, 1 Mar 2008 09:00:08 -0700 X-Original-Message-ID: <87C33F695961494D886EB3B6C8A476514D3230@s3server.Systems3.local> In-Reply-To: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [LML] Oil Temps and Oil Doors Thread-Index: Ach7WasAl6m/vnCSQy++y4mNP6xmAQAWgNQg From: "Craig Berland" X-Original-To: "Lancair Mailing List" This is a multi-part message in MIME format. ------_=_NextPart_001_01C87BB5.53131819 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable =20 On a recent trip from Florida to Tennessee I observed oil temps in the 150s. =20 =20 My engine is an IO-550N built by Monty Barrett. I decided not to install a remotely controlled oil door because I had been told that low oil temps were rarely/never a problem in the Legacy. My experience differs. =20 When I started the flight OATs (8000) ft were in the 40s and oil temps were in the 180s. But by the time I finished OATs (8000) were in the 20s and oil temps were in the 150s. Related to and probably partially the cause of the problem was my use of a low power setting (2300 RPM, no ram air, 30deg LOP) to extend range. Correct, running lean of peak will reduce oil temps which is a good thing....to a point. =20 Can low oil temps shorten TBO/damage the engine? I don't think 150 degF will shorten TBO.=20 Even with regular 25 hour oil changes using Exxon Elite? see above.=20 Should I go to the trouble to retrofit a remote oil door, If oil temp stays or goes much below 150 degF in cruise, I would install an oil door. or just change my oil at a shorter interval? This will not help at all. The cool oil will last longer than hot oil. I think everyone will say 180 degF is a "good" temp. 160 is OK as well.....as you go below 150 the grey line develops. All of this is my opinion. When I road raced cars we tried to get oil temp to 150degF before the race started. I would not suggest anyone cruise an airplane at 120 degF oil temp for example and I don't like oil temps above 200 degF. Also, I would prefer oil temp at 150 degF vs 220 degF for example. =20 Enquiring minds wish to know. =20 D. Brunner=20 Craig Berland=20 ------_=_NextPart_001_01C87BB5.53131819 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

On a recent trip from Florida to = Tennessee I=20 observed oil temps in the 150s.

My engine is an IO-550N built by Monty=20 Barrett. I decided not to install a remotely controlled oil door = because I=20 had been told that low oil temps were rarely/never a problem in the=20 Legacy. My experience differs.

When I started the flight OATs = (8000) ft were=20 in the 40s and oil temps were in the 180s. But by the time I = finished OATs=20 (8000) were in the 20s and oil temps were in the 150s. Related to = and=20 probably partially the cause of the problem was my use of a low power = setting=20 (2300 RPM, no ram air, 30deg LOP) to extend range. Correct, running = lean of=20 peak will reduce oil temps which is a good thing....to a=20 point.

Can low oil temps shorten = TBO/damage the=20 engine? I=20 don't think 150 degF will shorten = TBO.

Even with regular 25 = hour oil changes=20 using Exxon Elite? see above.

Should I go to the trouble to = retrofit a=20 remote oil door, If oil=20 temp stays or goes much below 150 degF in cruise, I would install an oil = door. or just change my oil at a shorter = interval? This will = not help at=20 all. The cool oil will last longer than hot oil. I think = everyone=20 will say 180 degF is a "good" temp. 160 is OK as well.....as you = go below=20 150 the grey line develops. All of this is my opinion. = When I=20 road raced cars we tried to get oil temp to 150degF before the race=20 started. I would not suggest anyone cruise an airplane at 120 degF = oil=20 temp for example and I don't like oil temps above 200 degF. Also, = I would=20 prefer oil temp at 150 degF vs 220 degF for=20 example.

Enquiring minds wish to = know.

D. Brunner

Craig = Berland

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