X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from centrmmtao01.cox.net ([70.168.83.83] verified) by logan.com (CommuniGate Pro SMTP 5.1c.3) with ESMTP id 1348777 for flyrotary@lancaironline.net; Fri, 25 Aug 2006 16:41:45 -0400 Received-SPF: none receiver=logan.com; client-ip=70.168.83.83; envelope-from=candtmallory@cox.net Received: from eastrmimpo01.cox.net ([68.1.16.119]) by centrmmtao01.cox.net (InterMail vM.6.01.06.01 201-2131-130-101-20060113) with ESMTP id <20060825204102.LTCL23821.centrmmtao01.cox.net@eastrmimpo01.cox.net> for ; Fri, 25 Aug 2006 16:41:02 -0400 Received: from yourd0f670b45a ([68.1.121.163]) by eastrmimpo01.cox.net with bizsmtp id ELgy1V00Y3XdHt80000000 Fri, 25 Aug 2006 16:40:59 -0400 Message-ID: <019601c6c886$c7f6c910$a3790144@yourd0f670b45a> From: "the mallorys" To: "Rotary motors in aircraft" Subject: Exhaust system Date: Fri, 25 Aug 2006 15:41:02 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0193_01C6C85C.DEC16300" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2869 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.2962 This is a multi-part message in MIME format. ------=_NextPart_000_0193_01C6C85C.DEC16300 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I've looked back through the archives, and seen lots of different ideas = for exhaust systems. But no real definitive answers. There is the Cool tube exhaust that has very short pipes,like Bob White = posted. There is the medium length, no muffler system like Buly has or like Joe = Hull has mocked up. There is the really long tubes with muffler hanging under belly like = Tracy has. Do we know what the correct length tube is to tune the exhaust for our = RPMs? Does this length include the muffler? It appears the diameter most used is from 1.5 to 2". What about the different mufflers? I only found two mufflers named in = the archive that guys are happy with, the Flowmaster Hushpower II, and = the Moroso Spiral Flow Racing Mufflers. Last year at Shady Bend, Monti = talked about noise levels and testing different mufflers and pipes. Are = there ant results from that? I'm ready to start mocking up my exhaust, so am seeking the collective = wisdom of the group. Chris ------=_NextPart_000_0193_01C6C85C.DEC16300 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

I've looked back through the archives, = and seen=20 lots of different ideas for exhaust systems. But no real = definitive=20 answers.

There is the Cool tube exhaust that has = very short=20 pipes,like Bob White posted.

There is the medium length, no muffler = system like=20 Buly has or like Joe Hull has mocked up.

There is the really long tubes with = muffler hanging=20 under belly like Tracy has.

Do we know what the correct length tube = is to tune=20 the exhaust for our RPMs? Does this length include the=20 muffler?

It appears the diameter most used is = from 1.5 to=20 2".

What about the different = mufflers? I=20 only found two mufflers named in the archive that guys are happy = with, the=20 Flowmaster Hushpower II, and = the Moroso Spiral Flow Racing = Mufflers. =20 Last year at Shady Bend, Monti talked about = noise levels=20 and testing different mufflers and pipes. Are there ant results = from=20 that?

I'm ready to start mocking up my = exhaust, so am=20 seeking the collective wisdom of the group.

Chris

------=_NextPart_000_0193_01C6C85C.DEC16300--