Return-Path: Sender: (Marvin Kaye) To: flyrotary Date: Sat, 15 Feb 2003 10:41:28 -0500 Message-ID: X-Original-Return-Path: Received: from [64.4.38.118] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 4.0.6) with ESMTP id 2024352 for flyrotary@lancaironline.net; Fri, 14 Feb 2003 22:23:01 -0500 Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Fri, 14 Feb 2003 19:23:00 -0800 X-Originating-IP: [65.137.51.167] Reply-To: "Tracy Crook" From: "Tracy Crook" X-Original-To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] 6 to 4 ports X-Original-Date: Fri, 14 Feb 2003 22:21:28 -0500 Organization: Real World Solutions Inc. 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 6.00.2800.1106 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-Original-Message-ID: X-OriginalArrivalTime: 15 Feb 2003 03:23:00.0788 (UTC) FILETIME=[8B12BF40:01C2D4A1] > Does anyone have an optimum configuration for the 13B as a NA engine? How > would you convert a 89 6 port to a 4 port engine? Just grind the end > housing ports to form one port? Or is there a 4 port type end housing that > could be used like a turbo II end housing. I am starting with a 88 NA and > a 89 NA. Thanks for any help. > > Joe Berki > Limo EZ After flying both 4 & 6 port engines for hundreds of hours, I would suggest not doing anything to the ports other than streamlining the square corner of the upper secondary ports. There is not a nickle's worth of difference in power between the two engines when normally aspirated. Tracy Crook tcrook@rotaryaviation.com www.rotaryaviation.com