X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 02 May 2005 08:55:36 -0400 Message-ID: X-Original-Return-Path: Received: from sccrmhc13.comcast.net ([204.127.202.64] verified) by logan.com (CommuniGate Pro SMTP 4.3c5) with ESMTP id 921985 for lml@lancaironline.net; Mon, 02 May 2005 07:48:10 -0400 Received-SPF: none receiver=logan.com; client-ip=204.127.202.64; envelope-from=mjrav@comcast.net Received: from mark1 (c-65-96-140-242.hsd1.ma.comcast.net[65.96.140.242]) by comcast.net (sccrmhc13) with SMTP id <20050502114725016002kev4e>; Mon, 2 May 2005 11:47:25 +0000 X-Original-Message-ID: <000901c54f0d$788e5490$f28c6041@mark1> From: "Mark Ravinski" X-Original-To: "Lancair Mailing List" Subject: Hard Facts About Engine Break-In X-Original-Date: Mon, 2 May 2005 07:52:52 -0400 MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_NextPart_000_0005_01C54EEB.F12EE2B0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1478 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1478 This is a multi-part message in MIME format. ------=_NextPart_000_0005_01C54EEB.F12EE2B0 Content-Type: multipart/alternative; boundary="----=_NextPart_001_0006_01C54EEB.F12EE2B0" ------=_NextPart_001_0006_01C54EEB.F12EE2B0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Walter, Mineral oil may be an "old wives tale" but it is a very popular one and = is still called for by Lycoming and Mattituck - the shop that did my = work. Break in can be also thought of as "wear in". Modern multi oils work = much better for reducing wear - maybe too well. What you are really trying to accomplish is to smooth up the cylinder = walls to a "just right" surface finish and fit. A lot can go wrong with this process and the list of variables is huge. A short break in may get the fit worn in past the point where a tight = engine is producing excess heat but that may not be where oil = consumption is minimal and compression is maximum. Most people here leave the mineral oil in for the first 50 hours. Mark Ravinski N360 KB = http://www.lycoming.textron.com/main.jsp?bodyPage=3D/support/publications= /keyReprints/operation/engineBreakIn.html ------=_NextPart_001_0006_01C54EEB.F12EE2B0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Walter,

Mineral oil may be an "old wives tale" = but it is a=20 very popular one and is still called for by Lycoming and Mattituck - the = shop=20 that did my work.

Break in can be also thought of as = "wear in". =20 Modern multi oils work much better for reducing wear - maybe too=20 well.

What you are really trying to = accomplish is to=20 smooth up the cylinder walls to a "just right" surface finish and=20 fit.

A lot can go wrong with this process = and the list=20 of variables is huge.

A short break in may get the fit worn = in past the=20 point where a tight engine is producing excess heat but that may not be = where=20 oil consumption is minimal and compression is maximum.

Most people here leave the mineral oil = in for the=20 first 50 hours.

Mark Ravinski

N360 KB

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