Return-Path: Received: from [24.25.9.101] (HELO ms-smtp-02-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.2b1) with ESMTP id 3140399 for flyrotary@lancaironline.net; Thu, 01 Apr 2004 09:09:04 -0500 Received: from edward (clt25-78-058.carolina.rr.com [24.25.78.58]) by ms-smtp-02-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id i31E8vkG009477 for ; Thu, 1 Apr 2004 09:08:58 -0500 (EST) Message-ID: <000a01c417f2$e1c67260$2402a8c0@edward> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Rusty's O2 / EM2 problems. Date: Thu, 1 Apr 2004 09:09:00 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0007_01C417C8.F8B731F0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1158 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_0007_01C417C8.F8B731F0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message . On mine max rich is around 1.0 volts, mids scale gives me around = 0.45-0.6 volts, low end drops off around 0.1.5 - 0.2 volts.=20 Thanks Ed. That is, of course, exactly what it should read. The next = step is to temporarily re-install the old mixture gauge, and compare it = to the EM-2. I will also measure the O2 sensor voltage at the same = time. I may even pick up another O2 sensor, just in case.=20 Is the O2 sensor you are using a heated 3/4 wire unit? If so I am = wondering whether you might possibly have a ground loop feeding heater = voltage onto your sensor lead? Good thought, but it's just the cheap single wire unit that Tracy and = Finn are both using. =20 Thanks, Rusty (mourning the loss of my 6 months paid severance vacation)=20 One thing I have heard is that with the single wire (Unheated) O2 = sensors you may get erratic readings until the sensor has been heated = sufficiently by the exhaust. I would think that would not take over = 2-3 minutes depending on what power levels you are operating at. =20 I use the heated O2 sensor as that gives you readings immediately on = start up. But, the non-heated type should get up to operating temps in = a minute or two I would think. Ed ------=_NextPart_000_0007_01C417C8.F8B731F0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message
 
 .

On mine max rich is around 1.0 volts, mids = scale gives=20 me around 0.45-0.6 volts, low end drops off around 0.1.5 - 0.2 = volts. 
 
Thanks Ed.  That is, of course, exactly what it should = read. =20 The next step is to temporarily re-install the old mixture gauge, = and=20 compare it to the EM-2.  I will also measure the O2 sensor = voltage at the=20 same time.   I may even pick up another O2 sensor, just in=20 case. 
 
Is the O2 sensor you are using a heated 3/4 = wire=20 unit?  If so I am wondering whether you might possibly have a = ground loop=20 feeding heater voltage onto your sensor lead?
 
 
Good=20 thought, but it's just the cheap single wire unit that Tracy and Finn = are both=20 using.  
 
Thanks,
Rusty (mourning the loss of my 6 months paid severance=20 vacation) 
 
 
One = thing I have=20 heard is that with the single wire (Unheated) O2 sensors you may get = erratic=20 readings until the sensor has been heated sufficiently by the = exhaust.  I=20 would think that would not take  over 2-3 minutes depending on = what power=20 levels you are operating at. 
 
I = use the heated=20 O2 sensor as that gives you readings immediately on start up.  = But, the=20 non-heated type should get up to operating temps in a minute or two I = would=20 think.
 
Ed
 
------=_NextPart_000_0007_01C417C8.F8B731F0--