X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [64.4.51.96] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 4.3.6) with ESMTP id 614921 for flyrotary@lancaironline.net; Mon, 25 Jul 2005 18:51:54 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.4.51.96; envelope-from=lors01@msn.com Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Mon, 25 Jul 2005 15:51:09 -0700 Message-ID: Received: from 64.4.51.220 by BAY107-DAV24.phx.gbl with DAV; Mon, 25 Jul 2005 22:51:08 +0000 X-Originating-IP: [64.4.51.220] X-Originating-Email: [lors01@msn.com] X-Sender: lors01@msn.com From: "Tracy Crook" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: FUEL FLOW was Re: [FlyRotary] Lycoming debugging test - -HELP! Date: Mon, 25 Jul 2005 18:51:06 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0134_01C59149.D0432A70" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: MSN 9 X-MimeOLE: Produced By MSN MimeOLE V9.10.0011.1703 Seal-Send-Time: Mon, 25 Jul 2005 18:51:06 -0400 X-OriginalArrivalTime: 25 Jul 2005 22:51:09.0165 (UTC) FILETIME=[590F99D0:01C5916B] This is a multi-part message in MIME format. ------=_NextPart_000_0134_01C59149.D0432A70 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Jim S. wrote =20 I could entertain the notion that vapor lock or air introduced into the=20 system was involved, but I can't come up with a scenario where the=20 engine ran great all summer and then acted up on cool days down in the=20 fall. The conditions for vapor lock aren't intermittent to my knowledge = - not there on a hot day, kicking my ass on a cold day. =20 If you are pretty sure you were running 300 rpm LOP (sounds like a lot) = then the cold temps could well be pushing it over the edge. All else = being equal, an engine will run leaner when the air temp is lower. I = have no clue as to why it is lean to begin with though. Tracy ------=_NextPart_000_0134_01C59149.D0432A70 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Jim S. wrote 

I could entertain the notion that vapor lock or air introduced = into the=20
system was involved, but I can't come up with a scenario where the=20
engine ran great all summer and then acted up on cool days down in = the=20
fall.  The conditions for vapor lock aren't intermittent to my=20 knowledge
- not there on a hot day, kicking my ass on a cold = day. =20
 
If you are pretty sure you were running 300 = rpm LOP=20 (sounds like a lot) then the cold temps could well be pushing it over = the=20 edge.  All else being equal, an engine will run leaner when the air = temp is=20 lower.   I have no clue as to why it is lean to begin with=20 though.
 
Tracy
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