X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imr-da02.mx.aol.com ([205.188.105.144] verified) by logan.com (CommuniGate Pro SMTP 5.4.5) with ESMTP id 5590625 for flyrotary@lancaironline.net; Sat, 09 Jun 2012 23:59:45 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.188.105.144; envelope-from=DLOMHEIM@aol.com Received: from mtaomg-mb06.r1000.mx.aol.com (mtaomg-mb06.r1000.mx.aol.com [172.29.41.77]) by imr-da02.mx.aol.com (8.14.1/8.14.1) with ESMTP id q5A3x8tH018246 for ; Sat, 9 Jun 2012 23:59:08 -0400 Received: from core-mdc001b.r1000.mail.aol.com (core-mdc001.r1000.mail.aol.com [172.29.45.129]) by mtaomg-mb06.r1000.mx.aol.com (OMAG/Core Interface) with ESMTP id 88D3FE00008A for ; Sat, 9 Jun 2012 23:59:08 -0400 (EDT) From: DLOMHEIM@aol.com Message-ID: <2518f.241a8d68.3d05758c@aol.com> Date: Sat, 9 Jun 2012 23:59:08 -0400 (EDT) Subject: Exhaust Question... To: flyrotary@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="part1_2518f.241a8d68.3d05758c_boundary" X-Mailer: 9.0 Security Edition for Windows sub 5378 X-Originating-IP: [98.188.125.114] x-aol-global-disposition: G DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20110426; t=1339300748; bh=WzY03J5/Z2JBNqCOp/XLM4Be0KqFdgFzL1iBj1LOB3A=; h=From:To:Subject:Message-ID:Date:MIME-Version:Content-Type; b=T/Rlu80mWmzGyX9IASKRY8YMcv72DsSWDYbNSgUBnpNVC9vXVxPqQpBLKz9yUPl9g SeE7dgox4hpU/S8tlXxC+3XHBfd3o6ztxjIxVU8kJuRdfBhtKQokvax+wuPcKfM302 SfhRUIAJmfkgJt8obAFydT0NyNZX8+v3f+PV3INw= X-AOL-SCOLL-SCORE: 0:2:453546176:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d294d4fd41b8c4b39 --part1_2518f.241a8d68.3d05758c_boundary Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Rotary flyers: I did a couple of searches in the archives but couldn't really find the answer I was looking for so will post it here (sorry if this has be flogged in the past). I have a collector that is a 2 inch. OD pipe (from Burns SS I think), and it is fed by two 2 inch pipes coming from my exhaust manifold. My question is what are you guys (who have been flying for a while) finding works well as I proceed downstream? Should I keep it at 2 inches as I run it to a muffler, or should it be increased it size in an attempt to slow it down, decreased in size, etc. prior to hitting the muffler. I have yet to decide on a muffler so also am wondering if this is something I will have to attempt to build myself; or have some you had good luck by now with a certain brand? I think I read a while back that some of "decreased" the pipe size slightly as it comes out of the muffler (to the tip) and that reduced noise a bit and didn't really effect performance...is that true? Thanks for any inputs! Doug Lomheim 13B / RV-9A P.S. Had good turn out at our EAA sponsored Burger Burn and beautiful weather...but only one guy actually flew in...maybe Dennis / Mark / Bobby / Bill E. will be able to come up for visit next year! :) --part1_2518f.241a8d68.3d05758c_boundary Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

Rotary flyers:

I did a couple of searches in the archives but couldn't really fi= nd=20 the answer I was looking for so will post it here (sorry if this has be flo= gged=20 in the past).

I have a collector that is a 2 inch. OD pipe (from Burns SS I think), = and=20 it is fed by two 2 inch pipes coming from my exhaust manifold. My que= stion=20 is what are you guys (who have been flying for a while) finding works well = as I=20 proceed downstream? Should I keep it at 2 inches as I run it to a muf= fler,=20 or should it be increased it size in an attempt to slow it down, decreased = in=20 size, etc. prior to hitting the muffler. I have yet to dec= ide=20 on a muffler so also am wondering if this is something I will have to attem= pt to=20 build myself; or have some you had good luck by now with a certain brand?&n= bsp;=20

I think I read a while back that some of "decreased" the=20 pipe size slightly as it comes out of the muffler (to the tip) and tha= t=20 reduced noise a bit and didn't really effect performance...is that=20 true?

Thanks for any inputs!

Doug Lomheim

13B / RV-9A

P.S. Had good turn out at our EAA sponsored Burger Burn and beau= tiful=20 weather...but only one guy actually flew in...maybe Dennis / Mark / Bobby /= Bill=20 E. will be able to come up for visit next year! =20 :)

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