X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imf17aec.mail.bellsouth.net ([205.152.59.65] verified) by logan.com (CommuniGate Pro SMTP 4.3.5) with ESMTP id 1029554 for flyrotary@lancaironline.net; Sat, 02 Jul 2005 16:00:44 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.65; envelope-from=ceengland@bellsouth.net Received: from ibm57aec.bellsouth.net ([209.215.60.103]) by imf17aec.mail.bellsouth.net with ESMTP id <20050702195958.TGVZ15437.imf17aec.mail.bellsouth.net@ibm57aec.bellsouth.net> for ; Sat, 2 Jul 2005 15:59:58 -0400 Received: from [209.215.60.103] by ibm57aec.bellsouth.net with ESMTP id <20050702195956.YACM25470.ibm57aec.bellsouth.net@[209.215.60.103]> for ; Sat, 2 Jul 2005 15:59:56 -0400 Message-ID: <42C6F23B.1020005@bellsouth.net> Date: Sat, 02 Jul 2005 14:59:55 -0500 From: Charlie England User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.2) Gecko/20040804 Netscape/7.2 (ax) X-Accept-Language: en-us, en MIME-Version: 1.0 To: flyrotary Subject: [Fwd: RE: RV-List: Re: Exhaust wrap] Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Here's an interesting data point on the issue of ceramic coating of engine components. IIRC, this is a highly respected builder of Lyc aircraft engines with no motivation to make outlandish claims about this stuff. Charlie -------- Original Message -------- Subject: RE: RV-List: Re: Exhaust wrap Date: Wed, 29 Jun 2005 14:26:14 -0500 From: BPA Reply-To: rv-list@matronics.com To: --> RV-List message posted by: "BPA" Hi George, I've been following this exhaust wrap debate all morning and decided I would get a word in. Now, I am not an expert on exhaust systems, my specialty lies in the building of high performance Lycoming engines (certified also), but I have on more than one occasion eye witnessed two different engines being tested on dynamometer using the ceramic coated exhaust systems. One engine, a TSIO-520 running on a test cell at another engine shop down from ours and a High Performance highly modified IO-540 300 HP engine on our own dyno. On both occasions, the mild steel pipes were ceramic coated inside and out. I could literally hold my hand within 1 inch of the pipes before I could feel any radiant heat from the pipes, and this was at full power. The shop responsible for these systems is Forsling Aviation in Co. We are working on some stuff for the RV-10 together, and doing some different testing with different types of exhaust packages. If you would like to talk with them, I would be more than happy to pass his number along. Regards, Allen Barrett Barrett Precision Engines, Inc. www.barrettprecisionengines.com (918) 835-1089 phone -----Original Message----- From: owner-rv-list-server@matronics.com [mailto:owner-rv-list-server@matronics.com] On Behalf Of gmcjetpilot@yahoo.com To: rv-list@matronics.com Subject: RV-List: Re: Exhaust wrap --> RV-List message posted by: Here is the con of the Exhaust wrap as I understand it. I asked a two manufactures of custom aircraft aircraft exhaust and was warned not to use wrap. Apparently the exhaust pipe is put under more stress (thermal) and leads to early failure. Also wrap can collect oil and cause a fire. Apparently it is not an uncommon problem. Wrap at your own risk. I like the idea, but if it increases the fire danger or chance of an exhaust crack, I will pass for now. The other scheme to reduce heat under the cowl is ceramic coatings. I was told flat out buy one exhaust manufacture that he would not warranty my exhaust with ceramic. Again more likely to crack. It make sense. If you keep the exhaust super heated and unable to cool it may fail earlier. As far as ceramics there may be a whole different mechanism in causing cracks in exhaust pipes.Any technical data or experience with wrap. I am only going on what the people who make stainless steel exhaust say. Is thick walled mild steel better with wraps or coatings? Cheers George Time: 06:43:08 PM PST US From: "RV6 Flyer" Subject: exhaust wrap --> RV-List message posted by: "RV6 Flyer" Been using the stuff Aircraft Spruce sells since about 50 hours. I leave it natural in color. I have found that stainless steel hose clamps work best. Have tried the strap bands sold for the job and safety wire. The hose clamps do the best job. I have never wrapped any wield or joint so that these items can be inspected. When you wrap a join or get a break in the pipe, it will BLOW through the wrap. I have never had a break in my pipe yet but know on RV-3 with an OLD Toole (spelling) exhaust that did. Gary A. Sobek "My Sanity" RV-6 N157GS O-320 Hartzell, 1,690 + Flying Hours So. CA, USA http://SoCAL_WVAF.rvproject.com ----Original Message Follows---- From: Louis Willig Subject: RV-List: exhaust wrap --> RV-List message posted by: Louis Willig Hi gang, I just removed the exhaust wrap that was applied by the builder of my RV-4, IO-360. After nearly 500 hours, the wrap had deteriorated and could be torn off by hand. I never liked the wrap because I always believed that it might be hiding underlying problems. BUT, now that it's been removed, I realize how effective it has been. Since there were no problems found after removal, I think I will replace it. So, does anyone have a suggestion concerning the best brand(s) to use and what color to use. All suggestions will be considered. Thanks. Louis I Willig 1640 Oakwood Dr. Penn Valley, PA 19072 610 668-4964 RV-4, N180PF 190HP IO-360, C/S prop --------------------------------- Find restaurants, movies, travel & more fun for the weekend. Check it out! _-============================================================ _-= - The RV-List Email Forum - _-= Use the Matronics List Features Navigator to browse _-= the many List utilities such as the Subscriptions page, _-= Archive Search & Download, 7-Day Browse, Chat, FAQ, _-= Photoshare, and much much more: _-= _-= --> http://www.matronics.com/Navigator?RV-List _-============================================================