X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mx2.magma.ca ([206.191.0.250] verified) by logan.com (CommuniGate Pro SMTP 4.3.4) with ESMTPS id 984773 for flyrotary@lancaironline.net; Sat, 04 Jun 2005 17:50:51 -0400 Received-SPF: none receiver=logan.com; client-ip=206.191.0.250; envelope-from=ianddsl@magma.ca Received: from mail1.magma.ca (mail1.magma.ca [206.191.0.252]) by mx2.magma.ca (8.13.0/8.13.0) with ESMTP id j54Lo4eh012389 for ; Sat, 4 Jun 2005 17:50:05 -0400 Received: from binky (ottawa-hs-64-26-156-111.s-ip.magma.ca [64.26.156.111]) by mail1.magma.ca (8.13.0/8.13.0) with SMTP id j54Lo2cD010133 for ; Sat, 4 Jun 2005 17:50:05 -0400 Reply-To: From: "Ian Dewhirst" To: "Rotary motors in aircraft" Subject: RE: [FlyRotary] BAR GRAPH AIR/FUEL GAUGE Date: Sat, 4 Jun 2005 17:49:56 -0400 Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 8bit X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.6604 (9.0.2911.0) X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 Importance: Normal In-Reply-To: Hi Yvon, what type of fuel system are you using? -- Ian -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On Behalf Of Géraldine Berger & Yvon Cournoyer Sent: Saturday, June 04, 2005 5:37 PM To: Rotary motors in aircraft Subject: [FlyRotary] BAR GRAPH AIR/FUEL GAUGE I fly a Zenair Zenith 200 with a l986 13B. I have installed a Cyberdyne Instruments bar graph air/fuel gauge (P/N 7009). The O2 sensor is located ~31 inches from the exhaust ports. The O2 sensor is not a Cyberdyne Instruments part. It is an aftermarket universal single wire sensor. The readings of the air/fuel gauge are baffling me. At idle of 1100 rpm and MP of 14.1-14.2 inches/mercury, the air/fuel gauge shows a rich condition of ~12.7:1. That is where the engine runs best at idle. At full power static of 5200-5250 rpm and MP of ambient (~30 inches/mercury), the air/fuel gauge reads rich ~13.2:1. However, when I retard the throttle to 3000-3500 rpm, at a MP of 17.0-17.1 inches/mercury, then the air/fuel gauge reads lean at ~16.0:1. The engine runs quite evenly at all power settings but I wonder if the variations in fuel mixture are normal and safe? Yvon. >> Homepage: http://www.flyrotary.com/ >> Archive: http://lancaironline.net/lists/flyrotary/List.html