X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sat, 22 Apr 2006 17:17:51 -0400 Message-ID: X-Original-Return-Path: Received: from smtp111.sbc.mail.mud.yahoo.com ([68.142.198.210] verified) by logan.com (CommuniGate Pro SMTP 5.0.9) with SMTP id 1076833 for lml@lancaironline.net; Sat, 22 Apr 2006 15:21:44 -0400 Received-SPF: none receiver=logan.com; client-ip=68.142.198.210; envelope-from=elippse@sbcglobal.net Received: (qmail 95271 invoked from network); 22 Apr 2006 19:21:00 -0000 Received: from unknown (HELO Computerroom) (elippse@sbcglobal.net@71.148.2.210 with login) by smtp111.sbc.mail.mud.yahoo.com with SMTP; 22 Apr 2006 19:21:00 -0000 X-Original-Message-ID: <000501c66641$e68dadf0$d2029447@Computerroom> From: "Paul Lipps" X-Original-To: Subject: More on CHTs X-Original-Date: Sat, 22 Apr 2006 12:21:01 -0700 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0002_01C66607.382BDA00" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2869 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2869 This is a multi-part message in MIME format. ------=_NextPart_000_0002_01C66607.382BDA00 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Eureka! I found it! Lycoming Flyer Key Reprints. "In our many years = of buillding engines, the engines have benefited during continuous = operation by keeping CHT below 400F in order to achieve best life and = wear of the powerplant. In general, it would be normal during all year = operations, in climb and cruise to see head temperatures in the range of = 350F to 435F." The average of that last, BTW, is 392.5F. For some = reason, pilots seem to think that operating their engines at low CHTs is = beneficial. It isn't! When the pistons operate at lower temperatures = than their design value, the piston does not expand sufficiently to = reduce clearances, thus promoting blow by and piston slap. How many of = you are at an age where you expect to see 2000 hours on your engine with = 50-75 hours of operation per year. That's 27 to 40 years! Even 100 hours = per year will take you 20 years. And in our fast-glass planes, you don't = accumulate a lot of time in your flying, even on long X-country flights, = unless you are using your plane for business. Run those engines at rated = rpm and temperature; it will love you for it! And don't we all need a = lot of lovin'! ------=_NextPart_000_0002_01C66607.382BDA00 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
    Eureka! I found it! Lycoming = Flyer Key=20 Reprints. "In our many years of buillding engines, the engines have = benefited=20 during continuous operation by keeping CHT below 400F in order to = achieve=20 best life and wear of the powerplant. In general, it would be = normal during=20 all year operations, in climb and cruise to see head temperatures in the = range=20 of 350F to 435F." The average of that last, BTW, is 392.5F. For some = reason,=20 pilots seem to think that operating their engines at low CHTs is = beneficial. It=20 isn't! When the pistons operate at lower temperatures than their design = value,=20 the piston does not expand sufficiently to reduce clearances, thus = promoting=20 blow by and piston slap. How many of you are at an age where you expect = to see=20 2000 hours on your engine with 50-75 hours of operation per year. = That's 27=20 to 40 years! Even 100 hours per year will take you 20 years. And in = our=20 fast-glass planes, you don't accumulate a lot of time in your flying, = even on=20 long X-country flights, unless you are using your plane for = business. Run=20 those engines at rated rpm and temperature; it will love you for it! And = don't=20 we all need a lot of lovin'!
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