Return-Path: Received: from [24.25.9.103] (HELO ms-smtp-04-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.2.5) with ESMTP id 557708 for flyrotary@lancaironline.net; Mon, 06 Dec 2004 11:50:05 -0500 Received-SPF: none receiver=logan.com; client-ip=24.25.9.103; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-069-132-109-019.carolina.rr.com [69.132.109.19]) by ms-smtp-04-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id iB6GnUCi017431 for ; Mon, 6 Dec 2004 11:49:31 -0500 (EST) Message-ID: <002501c4dbb3$4ae66aa0$2502a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] ECU oxygen sensor Date: Mon, 6 Dec 2004 11:47:37 -0500 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-Virus-Scanned: Symantec AntiVirus Scan Engine Joe, Tracy's EC2 EFI controller does not use any O2 sensor information. For most airborne application, it is used to provided an indication of air/fuel ratio by lighting up one of series of LED diodes (usually 10) that correspond to a certain voltage level of the O2. This voltage level in turn is dependent on the amount of oxygen present in the exhaust. Lots of oxygen indicates your are lean (could dump more fuel in), minimal oxygen indicates rich as you have/are burning most of the oxygen in the incoming air. The automobile EFI controller uses the O2 sensor to maintain a stoichiometric ratio of 14.7:1 for emission purposes. It senses the O2 output in millisecond intervals and uses this to adjust the air/fuel ratio to maintain the correct ratio. Here is the URL for a fairly informative article on O2 sensors. http://www.autospeed.com.au/cms/A_0618/article.html An O2 sensor can be rendered useless for the automobile use reportedly after a few seconds/minutes of exposure to leaded gas such as 100LL. However, that does not render it useless as an air/fuel indicator - I get approx 100 hours on 100LL before the O2 sensor starts to lose responsiveness. If you use Mogas you would probably get much more. Hope this helps Ed ----- Original Message ----- From: "Joseph M Berki" To: "Rotary motors in aircraft" Sent: Monday, December 06, 2004 10:17 AM Subject: [FlyRotary] ECU oxygen sensor > I have been looking at various ECUs trying to understand how they > work. How does an ECU that uses an oxygen sensor for mixture control fair > when 100LL is used? Does the mixture control in Tracy's unit replace the > oxygen sensor? Thanks for any help. > > Joe Berki > Limo EZ > > > >> Homepage: http://www.flyrotary.com/ > >> Archive: http://lancaironline.net/lists/flyrotary/List.html