X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 09 Apr 2009 20:24:41 -0400 Message-ID: X-Original-Return-Path: Received: from iron7.midco.net ([24.220.0.83] verified) by logan.com (CommuniGate Pro SMTP 5.2.13) with ESMTP id 3575950 for lml@lancaironline.net; Thu, 09 Apr 2009 19:48:45 -0400 Received-SPF: none receiver=logan.com; client-ip=24.220.0.83; envelope-from=zoelt@sio.midco.net X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: Au4CAIcm3kkY3Km7PGdsb2JhbABDiW+LBm0BAQEBtmeDewY X-IronPort-AV: E=Sophos;i="4.40,163,1238994000"; d="scan'208";a="362604205" Received: from host-187-169-220-24.midco.net (HELO YOUR105B4D3942) ([24.220.169.187]) by out.vip.midco.net with ESMTP; 09 Apr 2009 18:48:08 -0500 From: X-Original-To: "'Lancair Mailing List'" References: Subject: RE: [LML] Re: Hot #2 on IO-550-N X-Original-Date: Wed, 13 May 2009 18:46:45 -0500 X-Original-Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Office Outlook 11 Thread-Index: Acm5CbIPnEAtRJuBT4SGV6dlF4xt7gbGf0Eg In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 X-Antivirus: avast! (VPS 090409-0, 04/09/2009), Outbound message X-Antivirus-Status: Clean Snugly. Charlie Kohler checked it. The guys at RDD checked it when they did their sealing baffling process ($2000) that didn't help. In my opinion we need to increase upper deck pressure (change cowl,naca scoop, move intercoolers) or reduce lower deck pressure(open rear of lower cowl, louver below #2 cylinder, cowl flaps). I don't know, but I'll let you know when OATs get warmer and my temps go up. Tim -----Original Message----- From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Walter Atkinson Sent: Thursday, April 09, 2009 6:53 AM To: lml@lancaironline.net Subject: [LML] Re: Hot #2 on IO-550-N Does the aft lower baffle wrap snugly around the lower fat fins with the space above?? Walter On Apr 8, 2009, at 9:52 AM, wrote: Thanks Walter, What if you've done that and the cylinder is still hot? 30 degrees, all situations, airspeeds, climb and descent, all EGTs. I've even shielded the turbos on BOTH sides. Is next step opening lower cowl? Spring is upon us and I fear I won't keep #2 below 420 when weather gets warmer. Thanks, Tim -----Original Message----- From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Walter Atkinson Sent: Tuesday, April 07, 2009 6:32 PM To: lml@lancaironline.net Subject: [LML] Re: Hot #2 on IO-550-N 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 -- 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 -- For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.html