X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from eastrmmtao01.cox.net ([68.230.240.38] verified) by logan.com (CommuniGate Pro SMTP 5.1c.3) with ESMTP id 1348866 for flyrotary@lancaironline.net; Fri, 25 Aug 2006 18:07:36 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.240.38; envelope-from=candtmallory@cox.net Received: from eastrmimpo01.cox.net ([68.1.16.119]) by eastrmmtao01.cox.net (InterMail vM.6.01.06.01 201-2131-130-101-20060113) with ESMTP id <20060825220654.PLET18847.eastrmmtao01.cox.net@eastrmimpo01.cox.net> for ; Fri, 25 Aug 2006 18:06:54 -0400 Received: from yourd0f670b45a ([68.1.121.163]) by eastrmimpo01.cox.net with bizsmtp id EN6s1V0053XdHt80000000 Fri, 25 Aug 2006 18:06:52 -0400 Message-ID: <002901c6c892$c79b1e10$a3790144@yourd0f670b45a> From: "the mallorys" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Exhaust system Date: Fri, 25 Aug 2006 17:06:56 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0026_01C6C868.DEA3AB60" 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_0026_01C6C868.DEA3AB60 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable 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_0026_01C6C868.DEA3AB60 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
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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