X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-oa0-f45.google.com ([209.85.219.45] verified) by logan.com (CommuniGate Pro SMTP 6.0.6) with ESMTPS id 6432228 for flyrotary@lancaironline.net; Mon, 19 Aug 2013 04:15:17 -0400 Received-SPF: none receiver=logan.com; client-ip=209.85.219.45; envelope-from=andrew@martinag.com.au Received: by mail-oa0-f45.google.com with SMTP id m1so5442979oag.32 for ; Mon, 19 Aug 2013 01:14:41 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:content-type; bh=WuoH8Cl32fsOfZGiSV9d3HE8guMe5ij6H385W0JU2IY=; b=WMtb6hQ6WizQAXsbgjBf9oVT0ZwxB+lF1fJGztszDY4jF8RFh+tdm+2pLT+mvcrxii SXd8SLFYasHIMMY7Zy5UiHY9rnXBM7uVo8jHgIAX5VpCLgjlGQZrSQ1vpOw1Nxn9dFad YHsHBuKAs/c6x69z8fc0WIah/Vtv7wcVKX+BvT+mPsw9YKo8cFG2XlUFDzRc8Y73fdER sSxmIwPeGvMZVeG/3RBpuHRdEaeOBJ1GIW2mtwIOMQntOusKMhS0fSXwNqxOu2dl9h1g kTfNvntaAmwrJ3pdLR8DkKvH2WmMJgPHD+0DnqGkDpBhfT40qFEh4ZSTtcINLtye7Qd2 U2YA== X-Gm-Message-State: ALoCoQnGjGV9rMEBrYqBz2l/LmXpjloTnllH1fK3+Fu1LtJoG//oLPt3a5Lo5Twq+fb+xutEsnAJ MIME-Version: 1.0 X-Received: by 10.60.117.225 with SMTP id kh1mr11271960oeb.15.1376900081719; Mon, 19 Aug 2013 01:14:41 -0700 (PDT) Received: by 10.76.80.161 with HTTP; Mon, 19 Aug 2013 01:14:41 -0700 (PDT) X-Originating-IP: [202.40.0.40] In-Reply-To: References: Date: Mon, 19 Aug 2013 16:14:41 +0800 Message-ID: Subject: Re: [FlyRotary] Re: Oxygen Sensor ground From: Andrew Martin To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary=047d7b3a9a7c432d4b04e4488862 --047d7b3a9a7c432d4b04e4488862 Content-Type: text/plain; charset=ISO-8859-1 Ok thanks Steve, What your saying is mine should be Ok to get the autotune done. Andrew On Mon, Aug 19, 2013 at 11:25 AM, Steven W. Boese wrote: > Andrew, > > > > 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. > > > > 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? > > > 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 > 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. > > 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 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. >> >> Dennis H. >> > > --047d7b3a9a7c432d4b04e4488862 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
Ok thanks Steve, What your saying is mine should be Ok to = get the autotune done.

Andrew




On Mon, Aug 19, 2013 at 11:25 AM, Steven= W. Boese <SBoese@uwyo.edu> wrote:

Andrew,

=A0

A properly working one wire (narrow band) O2 sensor will act like you de= scribe.=A0 They really only tell you if the mixture is rich or lean.=A0 Eve= n with a 10 turn potentiometer on the the mixture control, it takes very li= ttle change of that control to transition from rich to lean or lean to rich.

=A0

From Dennis' description, he may heve been seeing a drift in the sig= nal while constantly rich or lean without touching the mixture control or c= hanging anything else.=A0 Is this correct, Dennis?

=A0

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

=A0

From: Rotary motors in aircraft <flyrotary@lancaironlin= e.net> on behalf of Andrew Martin <andrew@martinag.com.au>
Sent: Sunday, August 18, 2013 7:03 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Oxygen Sensor ground
=A0
Thanks Dennis
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 g= oes from full rich to full fine with very small movement of the mixture. ho= pe adding 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.=A0 I finally decided to add a ground wir= e to the sensor case and that fixed it.=A0 The sensor uses the exhaust pipe= as it's ground.=A0 I used a stainless steel screw type hose clamp to hold the wire on the shell of the sensor.<= /div>
=A0
Dennis H.


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