X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imr-ma06.mx.aol.com ([64.12.78.142] verified) by logan.com (CommuniGate Pro SMTP 5.3.10) with ESMTP id 4586391 for flyrotary@lancaironline.net; Sat, 20 Nov 2010 12:07:59 -0500 Received-SPF: pass receiver=logan.com; client-ip=64.12.78.142; envelope-from=Lehanover@aol.com Received: from imo-da04.mx.aol.com (imo-da04.mx.aol.com [205.188.169.202]) by imr-ma06.mx.aol.com (8.14.1/8.14.1) with ESMTP id oAKH7K5B015261 for ; Sat, 20 Nov 2010 12:07:20 -0500 Received: from Lehanover@aol.com by imo-da04.mx.aol.com (mail_out_v42.9.) id q.bd8.58530a62 (37660) for ; Sat, 20 Nov 2010 12:07:19 -0500 (EST) Received: from magic-d17.mail.aol.com (magic-d17.mail.aol.com [172.19.155.133]) by cia-mb07.mx.aol.com (v129.7) with ESMTP id MAILCIAMB072-931c4ce800471fe; Sat, 20 Nov 2010 12:07:19 -0500 From: Lehanover@aol.com Message-ID: <27561.61e1e148.3a195a47@aol.com> Date: Sat, 20 Nov 2010 12:07:19 EST Subject: Re: [FlyRotary] Re: Tangential Muffler To: flyrotary@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="part1_27561.61e1e148.3a195a47_boundary" X-Mailer: 9.0 Security Edition for Windows sub 5382 X-AOL-IP: 72.187.199.116 X-Spam-Flag:NO X-AOL-SENDER: Lehanover@aol.com --part1_27561.61e1e148.3a195a47_boundary Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 11/20/2010 10:49:58 A.M. Eastern Standard Time, eanderson@carolina.rr.com writes: As I said, the results seem reasonable to me - and yes, you woke me up but had not had my 2nd cup of coffee {:>).. EVO should read Exhaust Valve Opening - my bad {:>) Ed Longer headers=lower torque peak. Shorter headers= higher torque peak. Larger pipe diameter= broader power band. Less peak torque. Smaller pipe diameter=narrower power band higher peak torque. Shorter collector=shorter power band. Longer collector =broader power band. Same number of bends all the same distance from the flange, where possible. The run out of the engine straight out as far as is possible before the first bend. It is not that the perfect system must be developed for each engine installation. It is just that the system must not leak. Must not fail and start a fire. Must not reduce the engines output substantially. And be quiet enough to hear the prop tips. The increased top speed after a muffler change speaks volumes. Lynn E. Hanover --part1_27561.61e1e148.3a195a47_boundary Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

In a message dated 11/20/2010 10:49:58 A.M. Eastern Standard Time,=20 eanderson@carolina.rr.com writes:

As I said, the results seem reasonable to me -= and yes,=20 you woke me up but had not had my 2nd cup of coffee {:>).. EVO= should=20 read Exhaust Valve Opening - my bad {:>)

Ed

Longer headers=3Dlower torque peak.

Shorter headers=3D higher torque peak.

Larger pipe diameter=3D broader power band. Less peak torque.

Smaller pipe diameter=3Dnarrower power band higher peak torque.

Shorter collector=3Dshorter power band.

Longer collector =3Dbroader power band.

Same number of bends all the same distance from the flange, where=20 possible.

The run out of the engine straight out as far as is possible before= the=20 first bend.

It is not that the perfect system must be developed for each engine= =20 installation.

It is just that the system must not leak. Must not fail and start a= fire.=20 Must not

reduce the engines output substantially. And be quiet enough to hear= the=20 prop tips.

The increased top speed after a muffler change speaks volumes.

Lynn E. Hanover

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