X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from eastrmmtao05.cox.net ([68.230.240.34] verified) by logan.com (CommuniGate Pro SMTP 5.1c.3) with ESMTP id 1350994 for flyrotary@lancaironline.net; Sun, 27 Aug 2006 10:50:03 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.240.34; envelope-from=candtmallory@cox.net Received: from eastrmimpo01.cox.net ([68.1.16.119]) by eastrmmtao05.cox.net (InterMail vM.6.01.06.01 201-2131-130-101-20060113) with ESMTP id <20060827144922.VGRC7951.eastrmmtao05.cox.net@eastrmimpo01.cox.net> for ; Sun, 27 Aug 2006 10:49:22 -0400 Received: from yourd0f670b45a ([68.1.121.163]) by eastrmimpo01.cox.net with bizsmtp id F2pH1V00R3XdHt80000000 Sun, 27 Aug 2006 10:49:18 -0400 Message-ID: <006601c6c9e7$fd0a0b00$a3790144@yourd0f670b45a> From: "the mallorys" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Exhaust system Date: Sun, 27 Aug 2006 09:49:23 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0063_01C6C9BE.13A29870" 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_0063_01C6C9BE.13A29870 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Bobby, Is Dennis using only the resonator, as if it were the muffler? So just = manifold, resonator, and tail pipe? 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, 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 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. 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, 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 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 Bobby=20 (engine still under sheetrock mud) :) -------------------------------------------------------------------------= --- 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. 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 -------------------------------------------------------------------------= --- -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/ ------=_NextPart_000_0063_01C6C9BE.13A29870 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
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 = muffler? =20 Are either of you putting the muffler inside the cowling?  If it = runs=20 that cool, it shouldn't be a problem.
 
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/
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