Return-Path: Received: from [65.54.169.101] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 4.2b4) with ESMTP id 130507 for flyrotary@lancaironline.net; Fri, 04 Jun 2004 16:47:52 -0400 Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Fri, 4 Jun 2004 13:47:21 -0700 Received: from 4.171.174.163 by bay3-dav71.bay3.hotmail.com with DAV; Fri, 04 Jun 2004 20:47:21 +0000 X-Originating-IP: [4.171.174.163] X-Originating-Email: [lors01@msn.com] X-Sender: lors01@msn.com From: "Tracy Crook" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Where MAP is measured matters Date: Fri, 4 Jun 2004 16:47:20 -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 Message-ID: X-OriginalArrivalTime: 04 Jun 2004 20:47:21.0405 (UTC) FILETIME=[21ED5ED0:01C44A75] Subject: [FlyRotary] Where MAP is measured matters > > I've been having a problem with the mixture balance between rotors > changing as RPM increases on my 13B from day 1 with my install. In my > case I had installed the MAP connection in a convenient hole on the > primary runner for rotor #1 of the stock 6 port lower intake manifold. > I wrongly assumed the response time of the MAP sensor would be slow > enough to damp the pulses in the intake but obviously this is not the > case. Moving the MAP connection to be just after the throttle body > completely resolved the problem. > > Perry Casson Glastar/13B - 20 hours > http://eaa154.dhs.org/perry The MAP sensors read pressure in REAL TIME and do it once for each rotor on every turn of the crank. They must see the summed pressure of both rotors. Do exactly as Perry suggested. Tracy Crook