X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [207.46.163.241] (HELO na01-by2-obe.outbound.protection.outlook.com) by logan.com (CommuniGate Pro SMTP 6.0.6) with ESMTPS id 6432032 for flyrotary@lancaironline.net; Sun, 18 Aug 2013 23:25:41 -0400 Received-SPF: none receiver=logan.com; client-ip=207.46.163.241; envelope-from=SBoese@uwyo.edu Received: from BL2PR05MB194.namprd05.prod.outlook.com (10.242.198.147) by BL2PR05MB196.namprd05.prod.outlook.com (10.242.198.155) with Microsoft SMTP Server (TLS) id 15.0.731.16; Mon, 19 Aug 2013 03:25:03 +0000 Received: from BL2PR05MB194.namprd05.prod.outlook.com ([169.254.7.58]) by BL2PR05MB194.namprd05.prod.outlook.com ([169.254.7.58]) with mapi id 15.00.0731.000; Mon, 19 Aug 2013 03:25:03 +0000 From: "Steven W. Boese" To: Rotary motors in aircraft Subject: RE: [FlyRotary] Re: Oxygen Sensor ground Thread-Topic: [FlyRotary] Re: Oxygen Sensor ground Thread-Index: AQHOnHgLZFuTNFbHkUyCWn7/gJd7x5mb27s1 Date: Mon, 19 Aug 2013 03:25:02 +0000 Message-ID: References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [70.196.192.137] x-forefront-prvs: 09435FCA72 x-forefront-antispam-report: SFV:NSPM;SFS:(199002)(189002)(24454002)(377454003)(76796001)(31966008)(47446002)(74366001)(54316002)(77096001)(74502001)(76786001)(76576001)(56816003)(83072001)(74662001)(33646001)(83322001)(81816001)(19580405001)(19580395003)(76482001)(77982001)(56776001)(81342001)(81542001)(46102001)(66066001)(80976001)(80022001)(74316001)(65816001)(63696002)(53806001)(59766001)(49866001)(75432001)(79102001)(69226001)(54356001)(50986001)(47736001)(51856001)(4396001)(47976001)(74706001)(81686001)(16236675002)(74876001)(24736002)(80792004);DIR:OUT;SFP:;SCL:1;SRVR:BL2PR05MB196;H:BL2PR05MB194.namprd05.prod.outlook.com;CLIP:70.196.192.137;RD:InfoNoRecords;A:1;MX:1;LANG:en; Content-Type: multipart/alternative; boundary="_000_c9a228921677422f9a508c6a540128d8BL2PR05MB194namprd05pro_" MIME-Version: 1.0 X-OriginatorOrg: uwyo.edu --_000_c9a228921677422f9a508c6a540128d8BL2PR05MB194namprd05pro_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Andrew, A properly working one wire (narrow band) O2 sensor will act like you descr= ibe. 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 ch= ange of that control to transition from rich to lean or lean to rich. From Dennis' description, he may heve been seeing a drift in the signal whi= le constantly rich or lean without touching the mixture control or changing= anything else. Is this correct, Dennis? Steve Boese RV6A, 1986 13B NA, RD1A, EC2 ________________________________ 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 Thanks Dennis I'll try that also, I've been wondering about this as my O2 sensor seemed r= eally 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 addin= g the earth helps as fine tuning has been difficult, so far been doing tuni= ng more by ear, but hard to do the fine settings. I was thinking that because I have a very short exhaust pipe from the heade= r(no muffler) that I may have had air reaching the sensor between exhaust p= ulses. Regards Andrew Martin On Mon, Aug 19, 2013 at 6:23 AM, Dennis Havarlah > wrote: 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 tha= t fixed it. The sensor uses the exhaust pipe as it's ground. I used a sta= inless steel screw type hose clamp to hold the wire on the shell of the sen= sor. Dennis H. --_000_c9a228921677422f9a508c6a540128d8BL2PR05MB194namprd05pro_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Andrew,

 

A properly working one wire (narrow band) O2 sensor wi= ll 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 c= ontrol, it takes very little change of that control to transition from rich to lean or lean to rich.

 

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

 

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

 

From: Rotary motors in ai= rcraft <flyrotary@lancaironline.net> on behalf of Andrew Martin <a= ndrew@martinag.com.au>
Sent: Sunday, August 18, 2013 7:03 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Oxygen Sensor ground
 
Thanks Dennis
I'll try that also, I've been wondering about this as my O2 sensor seemed r= eally 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 addin= g the earth helps as fine tuning has been difficult, so far been doing tuning more by ear, but hard to do t= he fine settings.
I was thinking that because I have a very short exhaust pipe from the heade= r(no muffler) that I may have had air reaching the sensor between exhaust p= ulses.

Regards

Andrew Martin





On Mon, Aug 19, 2013 at 6:23 AM, Dennis Havarlah= <clouduste= r@austin.rr.com> wrote:
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 exhaus= t pipe as it's ground.  I used a stainless steel screw type hose clamp to hold the wire on the shell of the sensor.<= /div>
 
Dennis H.

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