X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from access.aic-fl.com ([204.49.76.2] verified) by logan.com (CommuniGate Pro SMTP 5.0.8) with ESMTP id 1000721 for flyrotary@lancaironline.net; Mon, 27 Feb 2006 21:30:30 -0500 Received-SPF: none receiver=logan.com; client-ip=204.49.76.2; envelope-from=unicorn@gdsys.net Received: from b9k4u9 (unverified [204.49.76.29]) by access.aic-fl.com (Rockliffe SMTPRA 4.5.6) with SMTP id for ; Mon, 27 Feb 2006 20:23:06 -0600 Message-ID: <002001c63c1f$e4470470$1d4c31cc@b9k4u9> From: "Richard Sohn" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Exhaust Blowout Date: Mon, 27 Feb 2006 20:30:36 -0800 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_001D_01C63BDC.AA5B4570" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_001D_01C63BDC.AA5B4570 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Bobby, I believe it does not make any difference to the exhaust performance how = many pipes are coming out of the muffler as long as the total area of = all pipes remains the same. As soon as you make the pipes (tail pipe) = larger, you will get more noise. All sporty sounding exhausts are based = on this. In some smaller cars it may give better ground clearance having two = small pipes instead of one big one. Richard Sohn N-2071U ----- Original Message -----=20 From: Bobby J. Hughes=20 To: Rotary motors in aircraft=20 Sent: Monday, February 27, 2006 3:20 PM Subject: [FlyRotary] Re: Exhaust Blowout Richard, Driving down the road observing mufflers. (got to get a life) I have = noticed some cars with two small pipe exiting the muffler. I wonder what = effect this would have on sound and rpm's verses one small pipe or one = large pipe? Bobby -------------------------------------------------------------------------= ----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] = On Behalf Of Richard Sohn Sent: Monday, February 27, 2006 7:18 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Exhaust Blowout ----- Original Message -----=20 From: Steve Thomas=20 To: Rotary motors in aircraft=20 Sent: Monday, February 27, 2006 11:04 AM Subject: [FlyRotary] Re: Exhaust Blowout On Feb 27, 2006, at 1:02 PM, Richard Sohn wrote: ----- Original Message ----- From: al p wick To: Rotary motors in aircraft Sent: Monday, February 27, 2006 8:23 AM Subject: [FlyRotary] Re: Exhaust Blowout I'm not all that familiar with rotary characteristics. Puzzled = why tail pipe is such large diameter (2 pipes seam welded together). I = would think that exhaust pulse at any one moment is no greater than a = single tube diameter. Maybe someone can explain to me. -al wick Al, It seems you are right with the pipe sizes. We did a test at the = last Shady Bend meet. A small resonator box from Monty and added a 1 = 1/2" exit pipe. The result(regarding noise), also subjective, was = amazing, and the engine lost only 200RPM at the top end. Richard Sohn N-2071U Richard, do you have any photos? Best Regards, Steve Thomas=20 SteveT.Net Yes. Richard Sohn N-2071U ------=_NextPart_000_001D_01C63BDC.AA5B4570 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Bobby,
 
I believe it does not make any = difference to the=20 exhaust performance how many pipes are coming out of the muffler as long = as the=20 total area of all pipes remains the same. As soon as you make the pipes = (tail=20 pipe) larger, you will get more noise. All sporty sounding exhausts are = based on=20 this.
In some smaller cars it may give better = ground=20 clearance having two small pipes instead of one big one.
 
Richard Sohn
N-2071U
 
 
----- Original Message -----
From:=20 Bobby J. = Hughes=20
Sent: Monday, February 27, 2006 = 3:20=20 PM
Subject: [FlyRotary] Re: = Exhaust=20 Blowout

Richard,
 
Driving down the road observing mufflers. = (got to get a=20 life) I have noticed some cars with two small pipe exiting the = muffler. I=20 wonder what effect this would have on sound and rpm's verses one small = pipe or=20 one large pipe?
 
Bobby

From: Rotary motors in aircraft=20 [mailto:flyrotary@lancaironline.net] On Behalf Of Richard=20 Sohn
Sent: Monday, February 27, 2006 7:18 PM
To: = Rotary=20 motors in aircraft
Subject: [FlyRotary] Re: Exhaust=20 Blowout

 
----- Original Message -----
From:=20 Steve = Thomas=20
To: Rotary motors in = aircraft=20
Sent: Monday, February 27, = 2006 11:04=20 AM
Subject: [FlyRotary] Re: = Exhaust=20 Blowout


On Feb 27, 2006, at 1:02 PM, Richard Sohn wrote:
 
----- Original = Message=20 -----
From:=20 al=20 p wick
Sent:=20 Monday, February 27, 2006 8:23 AM
Subject:=20 [FlyRotary] Re: Exhaust Blowout

 
 
I'm not all that familiar with rotary characteristics. = Puzzled why=20 tail pipe is such large diameter (2 pipes seam welded together). = I would=20 think that exhaust pulse at any one moment is no greater than a = single=20 tube diameter. Maybe someone can explain to me.
 

-al wick
Al,
 
It seems you are = right with=20 the pipe sizes. We did a test at the last Shady Bend meet. A = small=20 resonator box from Monty and added a 1 1/2" exit pipe. The=20 result(regarding noise), also subjective, was amazing, and the = engine=20 lost only 200RPM at the top end.
 
Richard = SohnN-2071U
 
Richard, = do you have=20 any photos?

Best Regards,

Steve Thomas 
SteveT.Net
 
Yes.
 
Richard = Sohn
N-2071U
 
 



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