X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [66.219.56.245] (HELO mail.qnsi.net) by logan.com (CommuniGate Pro SMTP 5.4.5) with ESMTP id 5566322 for flyrotary@lancaironline.net; Tue, 29 May 2012 14:24:19 -0400 Received-SPF: none receiver=logan.com; client-ip=66.219.56.245; envelope-from=bhughes@qnsi.net X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message Return-Receipt-To: "Bobby J. Hughes" MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Subject: RE: [FlyRotary] Re: Exhaust temp Disposition-Notification-To: "Bobby J. Hughes" Date: Tue, 29 May 2012 13:23:44 -0500 Message-ID: <74120FDE88CAFE4DBDA8814BCE20A3F33F64F0@qnsi-mail.qnsi.net> In-Reply-To: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [FlyRotary] Re: Exhaust temp Thread-Index: Ac09xtiRIEJsR6AnQguXZEvSwQzjMQAAJIuA References: From: "Bobby J. Hughes" To: "Rotary motors in aircraft" Ernest, FWIW I'm using 2.5" pipe after the exhaust manifold. 7500 rpm at 40" MP is not a problem.=20 Bobby -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Ernest Christley Sent: Tuesday, May 29, 2012 1:12 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Exhaust temp Lehanover@aol.com wrote: > I was hoping you wouldn't see this, but now that the cat is out of the > bag............ > =20 > You can see the need for some shielding between the headers and any=20 > items that you don't want at the same temperature. Radiant energy is=20 > line of sight. If the header can see it, up goes the temperature. > =20 > Pieces of .015" stainless stood off the header about 1/2" to 3/4"=20 > breaks the line of sight. Building such on the header reduces the=20 > amount of material involved. It is easier to not heat things up than=20 > it is to cool it after you have. Use 1/4" hose clamps to hold onto the shielding. > =20 > A small blast tube to keep things moving past the headers is helpful. > I can make a picture if you like. Helps keep heat out of the intake=20 > system and thus more power. Very easy. Amazing results. > =20 > Lynn E. Hanover > =20 > =20 My exhaust is encased in a .015 stainless box down to the end of the collector. The down pipe and muffler are exposed, and I see where it is blistering the belly paint already. I'll be wrapping more of the exhaust in the thin stainless. I will also open the stainless box up to allow some blast air through. First I have to change that down pipe from 1.5" dia to 3". I can't seem to get above 5100RPM, and I think exhaust backpressure is my issue. -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html