X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imo-m23.mx.aol.com ([64.12.137.4] verified) by logan.com (CommuniGate Pro SMTP 5.1.10) with ESMTP id 2197611 for flyrotary@lancaironline.net; Wed, 25 Jul 2007 02:23:29 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.137.4; envelope-from=WRJJRS@aol.com Received: from WRJJRS@aol.com by imo-m23.mx.aol.com (mail_out_v38_r9.2.) id q.cc2.14477706 (65097) for ; Wed, 25 Jul 2007 02:22:48 -0400 (EDT) From: WRJJRS@aol.com Message-ID: Date: Wed, 25 Jul 2007 02:22:48 EDT Subject: Re: [FlyRotary] bench flowtest To: flyrotary@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1185344567" X-Mailer: 9.0 SE for Windows sub 5042 X-Spam-Flag: NO -------------------------------1185344567 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 7/24/2007 10:15:53 PM Pacific Standard Time, n3773@comcast.net writes: next wonderment - why are exhaust manifolds typically designed to get larger dia. as more tubes attach downstream (as with the waste plumbing in buildings), when, in reality, the flow is thru only one tube at a time? kevin (turrentine renesis coming soon!) Kevin, With rotaries they have found that a constantly expanding exhaust helps keep the pulse moving. It also keeps the LOUD moving. The Rotary will tolerate some back pressure, but since there is no exhaust valve it helps to be sure that there are as few reflecting surfaces as possible until the port is closing. Bill Jepson ************************************** Get a sneak peek of the all-new AOL at http://discover.aol.com/memed/aolcom30tour -------------------------------1185344567 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable
In a message dated 7/24/2007 10:15:53 PM Pacific Standard Time,=20 n3773@comcast.net writes:
<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3D"Comic Sans MS" color=3D#00= 0000=20 size=3D2>
next wonderment - why are exhaust manifo= lds=20 typically designed to get larger dia. as more tubes attach downstream= (as=20 with the waste plumbing in buildings), when, in reality, the flow is thru=20= only=20 one tube at a time?    kevin (turrentine renesis coming=20 soon!)
Kevin,
With rotaries they have found that a constantly expanding exhaust helps= =20 keep the pulse moving. It also keeps the LOUD moving. The Rotary will tolera= te=20 some back pressure, but since there is no exhaust valve it helps t= o be=20 sure that there are as few reflecting surfaces as possible until the port is= =20 closing.
Bill Jepson 



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