Return-Path: Received: from [24.25.9.100] (HELO ms-smtp-01-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.2b7) with ESMTP id 310275 for flyrotary@lancaironline.net; Sat, 10 Jul 2004 10:22:54 -0400 Received: from EDWARD (clt25-78-058.carolina.rr.com [24.25.78.58]) by ms-smtp-01-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id i6AEMMPg028350 for ; Sat, 10 Jul 2004 10:22:23 -0400 (EDT) Message-ID: <001c01c46689$5332fe20$2402a8c0@EDWARD> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: BOV more/less air flow Date: Sat, 10 Jul 2004 10:22:26 -0400 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1409 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 X-Virus-Scanned: Symantec AntiVirus Scan Engine Not stupid, Bob - Right on the money. The Mazda engineers figured you would indeed have their stock muffler system which does hold down the boost due to back pressure. In fact, one of the problems when guys put on some after market (and free flowing) exhaust systems on their Turbo RX-7s was all of a sudden they have over-boost problems. As best I recall there was a pre-silencer, CAT converter and a muffler in the exhaust system - well, I think the turbos did not have the pre-silencer. But, in any case, enough there to produce back pressure which kept the boost level down. Ed Ed Anderson RV-6A N494BW Rotary Powered Matthews, NC ----- Original Message ----- From: "Bob Tilley" To: "Rotary motors in aircraft" Sent: Saturday, July 10, 2004 7:47 AM Subject: [FlyRotary] Re: BOV more/less air flow > Ed, > > Stupid question here! Also wouldn't the lack of an exhaust system > speed up the exhaust flow?(No backpressure) therefore increasing the > speed of the turbine wheels? > > Bob > > On Jul 10, 2004, at 12:26 AM, Ed Anderson wrote: > > > >> Homepage: http://www.flyrotary.com/ > >> Archive: http://lancaironline.net/lists/flyrotary/List.html >