X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from hrndva-omtalb.mail.rr.com ([71.74.56.122] verified) by logan.com (CommuniGate Pro SMTP 6.0.6) with ESMTP id 6432297 for flyrotary@lancaironline.net; Mon, 19 Aug 2013 06:18:56 -0400 Received-SPF: pass receiver=logan.com; client-ip=71.74.56.122; envelope-from=clouduster@austin.rr.com Return-Path: X-Authority-Analysis: v=2.0 cv=aqMw+FlV c=1 sm=0 a=Yeze7ONhayXxPyghcQHGUw==:17 a=7-pByue8sLYA:10 a=SWs297tRmK4A:10 a=05ChyHeVI94A:10 a=ayC55rCoAAAA:8 a=KGjhK52YXX0A:10 a=c2IPw34grzgA:10 a=Ia-xEzejAAAA:8 a=eRLigfuSAAAA:8 a=oCcaPWc0AAAA:8 a=P6fKqZdYlIJLCvTwmnYA:9 a=wPNLvfGTeEIA:10 a=EzXvWhQp4_cA:10 a=QOsmJ_eSihx1m-wEFMEA:9 a=_W_S_7VecoQA:10 a=tXsnliwV7b4A:10 a=wENvvheyWhcjUose:21 a=Yeze7ONhayXxPyghcQHGUw==:117 X-Cloudmark-Score: 0 X-Authenticated-User: X-Originating-IP: 70.114.234.171 Received: from [70.114.234.171] ([70.114.234.171:53292] helo=DWHPC) by hrndva-oedge03.mail.rr.com (envelope-from ) (ecelerity 2.2.3.46 r()) with ESMTP id E3/15-25552-DE0F1125; Mon, 19 Aug 2013 10:18:21 +0000 Message-ID: From: "Dennis Havarlah" To: "Rotary motors in aircraft" References: In-Reply-To: Subject: Re: [FlyRotary] Re: Oxygen Sensor ground Date: Mon, 19 Aug 2013 05:18:17 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_091F_01CE9C9B.835012D0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Windows Mail 6.0.6002.18197 X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6002.18463 This is a multi-part message in MIME format. ------=_NextPart_000_091F_01CE9C9B.835012D0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable P {margin-top:0;margin-bottom:0;} That is correct Steve - my EM-2 showed a change during 2 to 3 seconds of = about 3 - 5 bars + or - from the what I considered the actual O-2 = reading. This was without touching the Mixture knob. Video now shows = it steady. Dennis H. ----- Original Message -----=20 From: Steven W. Boese=20 To: Rotary motors in aircraft=20 Sent: Sunday, August 18, 2013 10:25 PM Subject: [FlyRotary] Re: Oxygen Sensor ground =20 Andrew, =20 A properly working one wire (narrow band) O2 sensor will act like you = describe. They really only tell you if the mixture is rich or lean. = Even with a 10 turn potentiometer on the the mixture control, it takes = very little change of that control to transition from rich to lean or = lean to rich. =20 From Dennis' description, he may heve been seeing a drift in the signal = while constantly rich or lean without touching the mixture control or = changing anything else. Is this correct, Dennis? =20 Steve Boese =20 RV6A, 1986 13B NA, RD1A, EC2 =20 -------------------------------------------------------------------------= ------- From: Rotary motors in aircraft on behalf = of Andrew Martin Sent: Sunday, August 18, 2013 7:03 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Oxygen Sensor ground=20 Thanks Dennis =20 I'll try that also, I've been wondering about this as my O2 sensor = seemed really sensitive. using a single wire Bosch and reading on the = EM2 goes from full rich to full fine with very small movement of the = mixture. hope adding the earth helps as fine tuning has been difficult, = so far been doing tuning more by ear, but hard to do the fine settings. I was thinking that because I have a very short exhaust pipe from the = header(no muffler) that I may have had air reaching the sensor between = exhaust pulses. =20 Regards =20 Andrew Martin =20 On Mon, Aug 19, 2013 at 6:23 AM, Dennis Havarlah = wrote: =20 My single wire O-2 sensor data has been wandering up and down during = flight lately. I finally decided to add a ground wire to the sensor = case and that fixed it. The sensor uses the exhaust pipe as it's = ground. I used a stainless steel screw type hose clamp to hold the wire = on the shell of the sensor. =20 Dennis H. =20 No virus found in this message. Checked by AVG - www.avg.com Version: 2013.0.3392 / Virus Database: 3211/6588 - Release Date: = 08/18/13 ------=_NextPart_000_091F_01CE9C9B.835012D0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
That is correct Steve - my EM-2 = showed a change=20 during 2 to 3 seconds of about 3 - 5 bars + or - from the what I = considered the=20 actual O-2  reading.  This was without touching the Mixture=20 knob.  Video now shows it steady.
 
Dennis H.
----- Original Message -----
Sent: Sunday, August 18, 2013 10:25 PM
Subject: [FlyRotary] Re: Oxygen Sensor ground

Andrew,

 

A properly working one wire (narrow band) O2 = sensor will=20 act like you describe.  They really only tell you if the mixture = is rich=20 or lean.  Even with a 10 turn potentiometer on the the mixture = control,=20 it takes very little change of that control to transition from rich to = lean or=20 lean to rich.

 

From Dennis' description, he may heve been seeing = a drift=20 in the signal while constantly rich or lean without touching the = mixture=20 control or changing anything else.  Is this correct, Dennis?

 

Steve Boese
RV6A, 1986 13B NA, RD1A, = EC2

 

=20
From: Rotary motors in aircraft=20 <flyrotary@lancaironline.net> on behalf of Andrew Martin=20 <andrew@martinag.com.au>
Sent: Sunday, August 18, 2013 = 7:03=20 PM
To: Rotary motors in aircraft
Subject: = [FlyRotary] Re:=20 Oxygen Sensor ground
 
Thanks Dennis
I'll try that also, I've been wondering = about this=20 as my O2 sensor seemed really sensitive. using a single wire Bosch and = reading=20 on the EM2 goes from full rich to full fine with very small movement = of the=20 mixture. hope adding the earth helps as fine tuning has been = difficult, so far=20 been doing tuning more by ear, but hard to do the fine = settings.
I=20 was thinking that because I have a very short exhaust pipe from the = header(no=20 muffler) that I may have had air reaching the sensor between exhaust = pulses.

Regards

Andrew Martin





On Mon, Aug 19, 2013 at 6:23 AM, Dennis = Havarlah=20 <clouduster@austin.rr.com> wrote:
My single wire O-2 sensor data has been = wandering up=20 and down during flight lately.  I finally decided to add a = ground wire=20 to the sensor case and that fixed it.  The sensor uses the = exhaust pipe=20 as it's ground.  I used a stainless steel screw type hose clamp = to hold=20 the wire on the shell of the sensor.
 
Dennis = H.

No virus found in = this=20 message.
Checked by AVG - www.avg.com
Version: 2013.0.3392 / Virus Database: 3211/6588 - Release Date:=20 08/18/13

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