Return-Path: Received: from sccrmhc11.comcast.net ([204.127.202.55] verified) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 3060037 for flyrotary@lancaironline.net; Tue, 02 Mar 2004 23:53:39 -0500 Received: from rv8 (c-24-21-140-241.client.comcast.net[24.21.140.241]) by comcast.net (sccrmhc11) with SMTP id <2004030304533801100fm9ide> (Authid: n3773@comcast.net); Wed, 3 Mar 2004 04:53:38 +0000 Message-ID: <006501c400db$7ce6e100$f18c1518@rv8> Reply-To: "kevin lane" From: "kevin lane" To: "flyrotary" Subject: muffler questions Date: Tue, 2 Mar 2004 20:52:43 -0800 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0062_01C40098.4F254C90" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1158 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 This is a multi-part message in MIME format. ------=_NextPart_000_0062_01C40098.4F254C90 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable it has struck me that the rotary engine is quite similar to the 2 cycle = as far as exhaust noise. since some 2 cycle engines use resonators I = wondered why this approach isn't also used. last week dr. chuck = Williams spoke at the chapter 782 meeting, a life-time expert on 2 = cycles. I couldn't get him to expound too much about exhaust, but found = it interesting that he suggested a muffler with a rotor inside, just = like a turbo, althought performing no work other than dampening the = sound pulses. has this approach ever been tried? maybe that old joke = about muffler bearings was true! since he was mostly experienced with = racing snowmobiles, he said they simply use very long exhaust pipes for = noise suppression, although not a big concern in the racing circuit. I = have tried looking up info on resonator design, but haven't come across = anything yet. Kevin Lane Portland, OR e-mail-> n3773@comcast.net web-> http://home.comcast.net/~n3773 (browse w/ internet explorer) ------=_NextPart_000_0062_01C40098.4F254C90 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
it has struck me that the rotary = engine is quite=20 similar to the 2 cycle as far as exhaust noise.   since some 2 = cycle=20 engines use resonators I wondered why this approach isn't also = used.  last=20 week dr. chuck Williams spoke at the chapter 782 meeting, a life-time = expert on=20 2 cycles.  I couldn't get him to expound too much about exhaust, = but found=20 it interesting that he suggested a muffler with a rotor inside, just = like a=20 turbo, althought performing no work other than dampening the sound = pulses. =20 has this approach ever been tried?  maybe that old joke about = muffler=20 bearings was true!  since he was mostly experienced with racing=20 snowmobiles, he said they simply use very long exhaust pipes for noise=20 suppression, although not a big concern in the racing circuit.  I = have=20 tried looking up info on resonator design, but haven't come across = anything=20 yet.
Kevin Lane  Portland, = OR
e-mail-> n3773@comcast.net
web-> http://home.comcast.net/~n3773
(browse=20 w/ internet explorer)
------=_NextPart_000_0062_01C40098.4F254C90--