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 1348905 for flyrotary@lancaironline.net; Fri, 25 Aug 2006 18:39:17 -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_01C6C897.B6BD77C8" Subject: RE: [FlyRotary] Re: Exhaust system Disposition-Notification-To: "Bobby J. Hughes" X-MimeOLE: Produced By Microsoft Exchange V6.5.6944.0 Date: Fri, 25 Aug 2006 17:42:14 -0500 Message-ID: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [FlyRotary] Re: Exhaust system Thread-Index: AcbIk2pTsQ2hZFdUQrO09aS+EU8aIwAAQ8GQ From: "Bobby J. Hughes" To: "Rotary motors in aircraft" This is a multi-part message in MIME format. ------_=_NextPart_001_01C6C897.B6BD77C8 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Chris, =20 My manifold is stuck under the cowl mockup for at least another month and I do not have any pictures. Maybe Dennis can post a picture of his. He is using a swirl pipe and I am going to try a 180 deg bend to get the exhaust pointed in the needed direction. The muffler is cool but the exhaust manifold and pipe are very hot. We are both going to try the muffler inside the cowl with heat shielding and some air blowing over everything. Using a cut down stock manifold there is only one pipe and no collector I have concerns about heat in the cowl after shutdown with this arrangement. We shall see.=20 =20 Bobby ________________________________ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of the mallorys Sent: Friday, August 25, 2006 5:07 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Exhaust system Bobby, How long are your pipes before the muffler? Are either of you putting the muffler inside the cowling? If it runs that cool, it shouldn't be a problem. =20 Chris ----- Original Message -----=20 From: Bobby J. Hughes =20 To: Rotary motors in aircraft =20 Sent: Friday, August 25, 2006 4:08 PM Subject: [FlyRotary] Exhaust system =20 Chris, =20 If I remember correctly you have a Renesis. After hearing Dennis's run-up to 5100 rpms last week I am planning to use the same muffler he has. Here are the specs he gave me.=20 Hushpower II Flowmaster Performance Resonator 12512400 2.5 in. inlet/outlet 409 SS construction =20 This little muffler sounded much deeper and quieter than I expected. No level measurements but it was not unpleasant. We are both modifying the stock exhaust manifold but are trying two different methods of attaching the muffler to it. Will it hold up is another question.=20 =20 Bobby=20 (engine still under sheetrock mud) :) =20 =20 =20 =20 ________________________________ 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 =09 =09 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 =09 ________________________________ =09 -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/ =09 ------_=_NextPart_001_01C6C897.B6BD77C8 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable
Chris,
 
My manifold is stuck under the cowl mockup for = at least=20 another month and I do not have any pictures. Maybe Dennis can post a = picture of=20 his. He is using a swirl pipe and I am going to try a 180 deg bend to = get the=20 exhaust pointed in the needed direction. The muffler is cool but = the=20 exhaust manifold and pipe are very hot. We are both going to try the = muffler=20 inside the cowl with heat shielding and some air blowing over = everything. Using=20 a cut down stock manifold there is only one pipe and no=20 collector
I have concerns about heat in the cowl = after shutdown=20 with this arrangement. We shall see.
 
Bobby

From: Rotary motors in aircraft=20 [mailto:flyrotary@lancaironline.net] On Behalf Of the=20 mallorys
Sent: Friday, August 25, 2006 5:07 PM
To: = Rotary=20 motors in aircraft
Subject: [FlyRotary] Re: Exhaust=20 system

Bobby,
How long are your pipes before the = muffler? =20 Are either of you putting the muffler inside the cowling?  If it = runs that=20 cool, it shouldn't be a problem.
 
Chris
----- Original Message -----
From:=20 Bobby J. = Hughes=20
Sent: Friday, August 25, 2006 = 4:08=20 PM
Subject: [FlyRotary] Exhaust = system


 
Chris,
 
If I remember correctly you have a Renesis. = After hearing=20 Dennis's run-up to 5100 rpms last week I am planning to use the same = muffler=20 he has. Here are the specs he gave me.=20

Hushpower II

Flowmaster Performance=20 Resonator

12512400

2.5 in. = inlet/outlet

409 SS = construction

 

This=20 little muffler sounded much deeper and quieter than I expected. No = level=20 measurements but it was not unpleasant. We are both modifying the = stock=20 exhaust manifold but are trying two different methods of attaching the = muffler=20 to it.  Will it hold up is another question.

 

Bobby=20

(engine still under sheetrock mud) :)

 

 

 
 

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=20 short pipes,like Bob White posted.
There is the medium length, no = muffler system=20 like Buly has or like Joe Hull has mocked up.
There is the really long tubes with = muffler=20 hanging under belly like Tracy has.
 
Do we know what the correct length = tube is to=20 tune 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=20 with, the Flowmaster Hushpower II, and=20 the Moroso Spiral Flow = Racing=20 Mufflers.  Last year at Shady Bend, = Monti talked=20 about noise levels and testing different mufflers and pipes.  Are = there=20 ant results from that?
 
I'm ready to start mocking up my = exhaust, so am=20 seeking the collective wisdom of the group.
 
Chris

--
Homepage:  http://www.flyrotary.com/
Archive and=20 UnSub:  =20 http://mail.lancaironline.net/lists/flyrotary/
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