X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [64.4.51.82] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 4.3.4) with ESMTP id 985729 for flyrotary@lancaironline.net; Sun, 05 Jun 2005 21:48:42 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.4.51.82; envelope-from=lors01@msn.com Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Sun, 5 Jun 2005 18:47:56 -0700 Message-ID: Received: from 64.4.51.220 by BAY107-DAV10.phx.gbl with DAV; Mon, 06 Jun 2005 01:47:56 +0000 X-Originating-IP: [64.4.51.220] X-Originating-Email: [lors01@msn.com] X-Sender: lors01@msn.com From: "Tracy Crook" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] BAR GRAPH AIR/FUEL GAUGE Date: Sun, 5 Jun 2005 21:47:53 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_010B_01C56A18.39F53DE0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: MSN 9 X-MimeOLE: Produced By MSN MimeOLE V9.10.0011.1703 Seal-Send-Time: Sun, 5 Jun 2005 21:47:53 -0400 X-OriginalArrivalTime: 06 Jun 2005 01:47:56.0848 (UTC) FILETIME=[C3141300:01C56A39] This is a multi-part message in MIME format. ------=_NextPart_000_010B_01C56A18.39F53DE0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Sound's safe & normal but at 5200 you are wasting fuel at 13.3 a/f. = Lean it out if your system allows it. Tracy ----- Original Message -----=20 From: G=E9raldine Berger & Yvon Cournoyer = To: Rotary motors in aircraft=20 Sent: Saturday, June 04, 2005 5:36 PM Subject: [FlyRotary] BAR GRAPH AIR/FUEL GAUGE I fly a Zenair Zenith 200 with a l986 13B. I have installed a=20 Cyberdyne Instruments bar graph air/fuel gauge (P/N 7009). The O2 = sensor=20 is located ~31 inches from the exhaust ports. The O2 sensor is not a=20 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=20 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=20 inches/mercury), the air/fuel gauge reads rich ~13.2:1. However, when = I=20 retard the throttle to 3000-3500 rpm, at a MP of 17.0-17.1=20 inches/mercury, then the air/fuel gauge reads lean at ~16.0:1. The=20 engine runs quite evenly at all power settings but I wonder if the=20 variations in fuel mixture are normal and safe? Yvon.=20 >> Homepage: http://www.flyrotary.com/ >> Archive: = http://lancaironline.net/lists/flyrotary/List.html ------=_NextPart_000_010B_01C56A18.39F53DE0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Sound's safe & normal but at 5200 you are wasting fuel at 13.3=20 a/f. Lean it out if your system allows it.

Tracy

----- Original Message -----

From: G=E9raldine=20 Berger & Yvon Cournoyer

To: Rotary motors in = aircraft

Sent: Saturday, June 04, 2005 = 5:36=20 PM

Subject: [FlyRotary] BAR GRAPH = AIR/FUEL=20 GAUGE

I fly a Zenair Zenith 200 with a l986 = 13B. I=20 have installed a
Cyberdyne Instruments bar graph air/fuel gauge = (P/N=20 7009). The O2 sensor
is located ~31 inches from the exhaust ports. = The O2=20 sensor is not a
Cyberdyne Instruments part. It is an aftermarket = universal=20 single wire
sensor. The readings of the air/fuel gauge are = baffling me. At=20 idle of
1100 rpm and MP of 14.1-14.2 inches/mercury, the = air/fuel=20 gauge shows a
rich condition of ~12.7:1. That is where the engine = runs=20 best at idle.
At full power static of 5200-5250 rpm and MP of = ambient (~30=20
inches/mercury), the air/fuel gauge reads rich ~13.2:1. However, = when I=20
retard the throttle to 3000-3500 rpm, at a MP of 17.0-17.1=20
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.=20

>> Homepage: http://www.flyrotary.com/
>&= gt; =20 Archive: http://lancai= ronline.net/lists/flyrotary/List.html

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