Return-Path: <13brv3@bellsouth.net> Received: from imf25aec.mail.bellsouth.net ([205.152.59.73] verified) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 2993306 for flyrotary@lancaironline.net; Sun, 15 Feb 2004 12:57:54 -0500 Received: from rad ([68.221.170.13]) by imf25aec.mail.bellsouth.net (InterMail vM.5.01.06.05 201-253-122-130-105-20030824) with ESMTP id <20040215175754.GFVQ23866.imf25aec.mail.bellsouth.net@rad> for ; Sun, 15 Feb 2004 12:57:54 -0500 From: "Russell Duffy" <13brv3@bellsouth.net> To: "Flyrotary List" Subject: muffler? Date: Sun, 15 Feb 2004 11:55:52 -0600 Message-ID: <06d801c3f3ec$f3b39590$6001a8c0@rad> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_06D9_01C3F3BA.A9192590" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4510 Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 This is a multi-part message in MIME format. ------=_NextPart_000_06D9_01C3F3BA.A9192590 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Greetings, =20 I'm working on mounting this 14 pound Spin Tech muffler, and just have = to ask a question... =20 I know that rotaries are painfully loud with no exhaust on them. I also know that the cast manifold alone will help significantly, and that a = turbo will reduce the noise to about normal Lycoming levels. As I understand = it, this is partly due to the fact that there are twists and turns that the exhaust has to negotiate, which reduces the speed, and eliminates the supersonic pulses. =20 =20 As it turns out, my primary pipes will have to make three 90 degree = turns before they get to the collector. I've started wondering if these three turns are enough to reduce the noise to an acceptable level. My gut = feeling is that it won't be enough, but I think some people are already running = with little to no muffling. I sure would like to eliminate that muffler, but = I'm not optimistic that it will be possible. What do you think? Silly = idea? =20 Cheers, Rusty =20 ------=_NextPart_000_06D9_01C3F3BA.A9192590 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
Greetings,
 
I'm working on = mounting=20 this 14 pound Spin Tech muffler, and just have to ask a=20 question...
 
I know that = rotaries are=20 painfully loud with no exhaust on them.  I also know that the cast = manifold=20 alone will help significantly, and that a turbo will reduce the noise to = about=20 normal Lycoming levels.  As I understand it, this is partly = due to the=20 fact that there are twists and turns that the exhaust has to negotiate, = which=20 reduces the speed, and eliminates the supersonic pulses. =20
 
As it turns = out, my primary=20 pipes will have to make three 90 degree turns before they get to the=20 collector.  I've started wondering if these three turns are enough = to=20 reduce the noise to an acceptable level.  My gut feeling = is that it=20 won't be enough, but I think some people are already = running with=20 little to no muffling.  I sure would like to eliminate that = muffler,=20 but I'm not optimistic that it will be possible.  What do you = think? =20 Silly idea?
 
Cheers,
Rusty
  
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