Return-Path: Received: from misav10.sasknet.sk.ca ([142.165.20.174] verified) by logan.com (CommuniGate Pro SMTP 4.2b4) with ESMTP id 122899 for flyrotary@lancaironline.net; Thu, 03 Jun 2004 18:53:41 -0400 Received: from oregano.sasktel.net ([142.165.20.197]) by misav10 with InterScan Messaging Security Suite; Thu, 03 Jun 2004 16:53:08 -0600 Received: from sasktel.net (hssxrg69-11-16-227.sasknet.sk.ca [69.11.16.227]) by oregano.sasktel.net (SaskTel eMessaging Service) with ESMTPA id <0HYR008HR8WIJC@oregano.sasktel.net> for flyrotary@lancaironline.net; Thu, 03 Jun 2004 16:53:08 -0600 (CST) Date: Thu, 03 Jun 2004 16:53:49 -0600 From: Perry Casson Subject: Where MAP is measured matters In-reply-to: To: Rotary motors in aircraft Message-id: <40BFABFD.30002@sasktel.net> MIME-version: 1.0 Content-type: text/plain; charset=ISO-8859-1; format=flowed Content-transfer-encoding: 7BIT X-Accept-Language: en-us, en User-Agent: Mozilla Thunderbird 0.5 (Windows/20040207) References: 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