X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imo-m18.mx.aol.com ([64.12.138.208] verified) by logan.com (CommuniGate Pro SMTP 5.0c1) with ESMTP id 689800 for flyrotary@lancaironline.net; Thu, 01 Sep 2005 21:48:46 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.138.208; envelope-from=Lehanover@aol.com Received: from Lehanover@aol.com by imo-m18.mx.aol.com (mail_out_v38_r4.1.) id q.20c.84eba61 (4529) for ; Thu, 1 Sep 2005 21:47:56 -0400 (EDT) From: Lehanover@aol.com Message-ID: <20c.84eba61.3049094c@aol.com> Date: Thu, 1 Sep 2005 21:47:56 EDT Subject: Re: [FlyRotary] Single rotor exhaust header design?? To: flyrotary@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1125625676" X-Mailer: 9.0 SE for Windows sub 5017 X-Spam-Flag: NO -------------------------------1125625676 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 9/1/2005 6:11:40 PM Eastern Daylight Time, mike.wynn@spectra-physics.com writes: How do traditional `bunch of bananas' headers compare with VAM/tangential in terms of engine performance? Lynn, Leon ??? Cosworth figured out a long time ago that two ports from the sam cylinder are treated as a single pipe and ar joined at the port face. So in the case of the two exhaust rotary, I suspect that as soon as possible after the port face, joint the two runners, keeping them exactly the same length. Making two runners of different lengths from the same chamber would be hopefull at best. The vam muffler mounted tight against the engine precludes any scavenging effect at all, and adds back pressure to a very short runner. I'm guessing a flow disaster with big power loss. Leon will shortly have the exact answer for the first part. Lynn E. Hanover -------------------------------1125625676 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

In a message dated 9/1/2005 6:11:40 PM Eastern Daylight Time,=20 mike.wynn@spectra-physics.com writes:

<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size= =3D2>

How do traditional `bunch of bananas' heade= rs=20 compare with VAM/tangential in terms of engine performance?

Lynn, Leon ???

Cosworth figured out a long time ago that two ports from the sam cylind= er=20 are treated as a single pipe and ar joined at the port face. So in the case=20= of=20 the two exhaust rotary, I suspect that as soon as possible after the port fa= ce,=20 joint the two runners, keeping them exactly the same length. Making two runn= ers=20 of different lengths from the same chamber would be hopefull at best.

The vam muffler mounted tight against the engine precludes any scavengi= ng=20 effect at all, and adds back pressure to a very short runner. I'm guessing a= =20 flow disaster with big power loss.

Leon will shortly have the exact answer for the first part.

Lynn E. Hanover

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