X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 07 Apr 2009 19:31:46 -0400 Message-ID: X-Original-Return-Path: Received: from ironport5.liveoakmail.com ([216.110.12.21] verified) by logan.com (CommuniGate Pro SMTP 5.2.13) with ESMTP id 3572502 for lml@lancaironline.net; Tue, 07 Apr 2009 09:05:06 -0400 Received-SPF: none receiver=logan.com; client-ip=216.110.12.21; envelope-from=walter@advancedpilot.com X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AlYDACrs2klAMf4VgWdsb2JhbACWJAEBFiK3WoN9Bg Received: from rs5.liveoakhosting.com (HELO secure5.liveoakhosting.com) ([64.49.254.21]) by ironport5.liveoakmail.com with ESMTP; 07 Apr 2009 08:04:29 -0500 Received: (qmail 2787 invoked from network); 7 Apr 2009 08:04:29 -0500 Received: from ip12-197-248-25.networkusa.com (HELO ?10.0.1.2?) (12.197.248.25) by advancedpilot.com with (AES128-SHA encrypted) SMTP; 7 Apr 2009 08:04:29 -0500 X-Original-Message-Id: From: Walter Atkinson X-Original-To: "Lancair Mailing List" In-Reply-To: Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes Content-Transfer-Encoding: 7bit Mime-Version: 1.0 (Apple Message framework v930.3) Subject: Re: [LML] Re: Hot #2 on IO-550-N X-Original-Date: Tue, 7 Apr 2009 08:04:28 -0500 References: X-Mailer: Apple Mail (2.930.3) It's the way the air does NOT curl under the lower aft part of the cylinder. It has nothing to do with the oil cooler. The reason is the flat part of the aft section of the cylinder head has little to no fin depth. No air gets past this area to go to the lower fins. Add space between the aft part of the cylinder head and the metal baffle. About 3/8 inch seems to be optimal. This usually fixes it and makes #2 no longer the hottest CHT. Walter Atkinson Advanced Pilot Seminars On Apr 6, 2009, at 11:22 AM, Art Bertolina wrote: Jim I put Zetex on the baffeling behind the exhaust pipes. I don't know how much that has helped because it has been there from hour 1. #2 and #1 are my hottest cylinders but still are just under 300 in cruise at 17.6gph LOP Art ----- Original Message ----- From: "Jim Cameron" To: Sent: Monday, April 06, 2009 4:41 AM Subject: [LML] Hot #2 on IO-550-N > Friend of mine is scratching his head over his #2 cylinder on an > IO-550-N. Runs about 40 degrees hotter than the rest, although all > his EGT's are nearly the same. He spoke to a retired Continental > engineer, who told him that a lot of the IO-550's had that problem. > My friend has checked all the obvious, baffling leaks, shrouds > fitting properly, etc. He tried putting the oil cooler door on and > closing it part way, thinking maybe that would push more air over > the cylinder. No dice. The problem seems to be not enough air > flowing down between #2 and #4 -- that's the exhaust side of #2. > Has anyone else run into this? Any ideas how to push more air > through there? > > Jim Cameron > Legacy N132X > > > -- > For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.html -- For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.html