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 1351184 for flyrotary@lancaironline.net; Sun, 27 Aug 2006 14:02:35 -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_01C6CA03.64D03B5E" Subject: RE: [FlyRotary] Re: Exhaust system Disposition-Notification-To: "Bobby J. Hughes" X-MimeOLE: Produced By Microsoft Exchange V6.5.6944.0 Date: Sun, 27 Aug 2006 13:05:37 -0500 Message-ID: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [FlyRotary] Re: Exhaust system Thread-Index: AcbJ6Jkvydzg7Td2Qxy5Q2yBYUhmHwAGOxJQ From: "Bobby J. Hughes" To: "Rotary motors in aircraft" This is a multi-part message in MIME format. ------_=_NextPart_001_01C6CA03.64D03B5E Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Chris, =20 That is correct. The resonator is the muffler. It sounds very throaty. Much deeper sound than I expected. I think this resonator is just a smaller version of the Hushpower II muffler. Could be wrong. This is a picture on eBay. =20 http://cgi.ebay.com/ebaymotors/FLOWMASTER-HUSHPOWER-II-RESONATOR-2-5-12- 409-SS_W0QQitemZ170020047093QQcmdZViewItem =20 Bobby ________________________________ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of the mallorys Sent: Sunday, August 27, 2006 9:49 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Exhaust system Bobby, =20 Is Dennis using only the resonator, as if it were the muffler? So just manifold, resonator, and tail pipe? =20 Chris ----- Original Message -----=20 From: Bobby J. Hughes =20 To: Rotary motors in aircraft =20 Sent: Friday, August 25, 2006 5:42 PM Subject: [FlyRotary] Re: Exhaust system 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 =09 =09 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 =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_01C6CA03.64D03B5E Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable
Chris,
 
That is correct. The resonator is the muffler. = It sounds=20 very throaty. Much deeper sound than I expected. I think this resonator = is just=20 a smaller version of the Hushpower II muffler. Could be wrong.  = This is a=20 picture on eBay. 
http://cgi.ebay.com/eb= aymotors/FLOWMASTER-HUSHPOWER-II-RESONATOR-2-5-12-409-SS_W0QQitemZ1700200= 47093QQcmdZViewItem
 
Bobby
From: Rotary motors in aircraft=20 [mailto:flyrotary@lancaironline.net] On Behalf Of the=20 mallorys
Sent: Sunday, August 27, 2006 9:49 AM
To: = Rotary=20 motors in aircraft
Subject: [FlyRotary] Re: Exhaust=20 system

Bobby,
 
Is Dennis using only the resonator, as = if it were=20 the muffler?  So just manifold, resonator, and tail = pipe?
 
Chris
----- Original Message -----
From:=20 Bobby J. = Hughes=20
Sent: Friday, August 25, 2006 = 5:42=20 PM
Subject: [FlyRotary] Re: = Exhaust=20 system

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=20 of his. He is using a swirl pipe and I am going to try a 180 deg bend = to get=20 the 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.=20 Using a cut down stock manifold there is only one pipe and no=20 collector
I have concerns about heat in the cowl = after=20 shutdown 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=20 muffler?  Are either of you putting the muffler inside the = cowling? =20 If it runs that cool, it shouldn't be a problem. =20
 
Chris
----- Original Message -----
From:=20 Bobby = J. Hughes=20
To: Rotary motors in = aircraft=20
Sent: Friday, August 25, 2006 = 4:08=20 PM
Subject: [FlyRotary] Exhaust=20 system


 
Chris,
 
If I remember correctly you have a Renesis. = After=20 hearing Dennis's run-up to 5100 rpms last week I am planning to use = the same=20 muffler 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=20 muffler to it.  Will it hold up is another question. =

 

Bobby

(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:=20 Rotary 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=20 to 2".
 
What about the different = mufflers? =20 I 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=20 talked about noise levels and testing different mufflers and = pipes. =20 Are there 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/
------_=_NextPart_001_01C6CA03.64D03B5E--