Return-Path: Sender: (Marvin Kaye) To: flyrotary Date: Sun, 16 Feb 2003 18:19:51 -0500 Message-ID: X-Original-Return-Path: Received: from mallard.mail.pas.earthlink.net ([207.217.120.48] verified) by logan.com (CommuniGate Pro SMTP 4.0.6) with ESMTP id 2024642 for flyrotary@lancaironline.net; Sat, 15 Feb 2003 10:55:53 -0500 Received: from user-2ivfmi6.dialup.mindspring.com ([165.247.218.70]) by mallard.mail.pas.earthlink.net with esmtp (Exim 3.33 #1) id 18k4fP-0000Yx-00 for flyrotary@lancaironline.net; Sat, 15 Feb 2003 07:55:52 -0800 Mime-Version: 1.0 X-Sender: jh1001311@pop.onemain.com X-Original-Message-Id: In-Reply-To: References: X-Original-Date: Sat, 15 Feb 2003 07:54:29 -0800 X-Original-To: "Rotary motors in aircraft" From: Jerry Hey Subject: [FlyRotary] Re: 6 to 4 ports Content-Type: text/plain; charset="us-ascii" ; format="flowed" > > 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 > > >I glad to hear this. There are a lot of six ports out there. Jerry -- Jerry Hey Tailwind & Rotary Engine Support http://www.j-winddesigns.com mailto:j-winddesigns@thegrid.net