X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [66.219.56.248] (HELO qnsi-xch.qnsi.net) by logan.com (CommuniGate Pro SMTP 5.1c.3) with ESMTP id 1348829 for flyrotary@lancaironline.net; Fri, 25 Aug 2006 17:20:00 -0400 Received-SPF: none receiver=logan.com; client-ip=66.219.56.248; envelope-from=bhughes@qnsi.net Content-class: urn:content-classes:message Return-Receipt-To: "Bobby J. Hughes" MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C6C88C.A3220932" Subject: RE: [FlyRotary] Exhaust system Disposition-Notification-To: "Bobby J. Hughes" X-MimeOLE: Produced By Microsoft Exchange V6.5.6944.0 Date: Fri, 25 Aug 2006 16:22:58 -0500 Message-ID: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [FlyRotary] Exhaust system Thread-Index: AcbIh2Vpgd/1qDCyTq2wt1bmeuWaXgABIQJw From: "Bobby J. Hughes" To: "Rotary motors in aircraft" This is a multi-part message in MIME format. ------_=_NextPart_001_01C6C88C.A3220932 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable One more thing about this muffler. You can hold your hand on the muffler for a long time after the engine has started. The pipes are hot but the outside of the muffler was not. Dennis had a optical thermometer and took a few readings at idle and after a full throttle run. Don't remember exactly but it never got very hot.=20 =20 Bobby ________________________________ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of the mallorys Sent: Friday, August 25, 2006 3:41 PM To: Rotary motors in aircraft Subject: [FlyRotary] Exhaust system I've looked back through the archives, and seen lots of different ideas for exhaust systems. But no real definitive answers. =20 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. =20 Do we know what the correct length tube is to tune the exhaust for our RPMs? Does this length include the muffler? =20 It appears the diameter most used is from 1.5 to 2". =20 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? =20 I'm ready to start mocking up my exhaust, so am seeking the collective wisdom of the group. =20 Chris ------_=_NextPart_001_01C6C88C.A3220932 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable
One more thing about this muffler. You can hold = your hand=20 on the muffler for a long time after the engine has started. The pipes = are hot=20 but the outside of the muffler was not. Dennis had a optical thermometer = and=20 took a few readings at idle and after a full throttle run. Don't = remember=20 exactly but it never got very hot.
 
Bobby

From: Rotary motors in aircraft=20 [mailto:flyrotary@lancaironline.net] On Behalf Of the=20 mallorys
Sent: Friday, August 25, 2006 3:41 PM
To: = Rotary=20 motors in aircraft
Subject: [FlyRotary] Exhaust=20 system

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
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