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Date: Wed, 29 Sep 2010 08:31:20 -0500
Message-ID: <AANLkTikXY9DJNNkcbS0CDadDeic28OWeB2P3eGiSSaVV@mail.gmail.com>
Subject: Re: [FlyRotary] Auto tune/oxygen sensor
From: Mark Steitle <msteitle@gmail.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Content-Type: multipart/alternative; boundary=001485eba7981e8c9a049165fa71

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Bill,

Funny you would post this.  Last weekend I was attempting auto-tune without
much success.  I noticed that the O2 bar was off the bottom of the scale.
No amount of tweaking of the mixture knob would bring it back.  Attempts to
auto-tune would result in overly rich mixtures.  I had decided that the O2
sensor must have failed, but didn't have time to remove it.

I will take my old one down to Auto Zone and try to match it to another.  If
it is a narrow-band sensor, it is my understanding that they all work on the
same basic principle.  So, if it has the proper threads, and a single wire,
I don't see why it shouldn't work.  That's how I initially picked the one I
have been using for the last 200 hours.  Anyone see a flaw in my logic?

Mark S.

On Wed, Sep 29, 2010 at 8:10 AM, Bill Schertz <wschertz@comcast.net> wrote:

>  Was going to do some auto tune in the air yesterday, to get to some
> regions of the performance map that can't be reached on the ground.
>
> Took off and the O2 sensor indication completely disappeared from the EM-2
> display. Did one circuit of the airport and landed.
>
> Discovered that the O2 sensor had failed (physically -- the top fell off
> and separated from the body). This caused me to raise the following
> questions.
>
> 1. I believe that the oxygen sensor readout is only that, not used by the
> EC-2 for control purposes.
> 2. When in auto tune, is the EM-2 looking at the sensor for indications of
> which way to adjust the mixture? If not, what is the feedback mechanism?
>
> I went to the Auto parts store for a replacement, and ran into the problem
> that there are 100's of different oxygen sensors, and they need to know what
> car it came from. Anyone have the specs on what this sensor is?
>
>
> Bill Schertz
> KIS Cruiser #4045
> N343BS
> Phase I testing
>

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<div>Bill, </div>
<div>=A0</div>
<div>Funny you would post this.=A0 Last weekend I was attempting auto-tune =
without much success.=A0 I noticed that the O2 bar was off the bottom of th=
e scale.=A0 No amount of tweaking of the mixture knob would bring it back.=
=A0 Attempts to auto-tune would result in=A0overly rich mixtures.=A0 I had =
decided that the O2 sensor must have failed, but didn&#39;t have time to re=
move it.=A0 </div>

<div>=A0</div>
<div>I will take my old one down to Auto Zone and try to match it to anothe=
r.=A0 If it is a narrow-band sensor, it is my understanding that=A0they all=
 work on the same basic principle.=A0 So, if it has the=A0proper threads, a=
nd=A0a single=A0wire, I don&#39;t see why it shouldn&#39;t work.=A0 That&#3=
9;s how I initially picked the one I have been using for the last 200 hours=
.=A0 Anyone see a flaw in my logic?</div>

<div>=A0</div>
<div>Mark S.<br><br></div>
<div class=3D"gmail_quote">On Wed, Sep 29, 2010 at 8:10 AM, Bill Schertz <s=
pan dir=3D"ltr">&lt;<a href=3D"mailto:wschertz@comcast.net">wschertz@comcas=
t.net</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"PADDING-LEFT: 1ex; MARGIN: 0px 0=
px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
<div style=3D"PADDING-RIGHT: 10px; PADDING-LEFT: 10px; PADDING-TOP: 15px" n=
ame=3D"Compose message area">
<div><font face=3D"Arial" size=3D"2">Was going to do some auto tune in the =
air yesterday, to get to some regions of the performance map that can&#39;t=
 be reached on the ground.</font></div>
<div><font face=3D"Arial" size=3D"2"></font>=A0</div>
<div><font face=3D"Arial" size=3D"2">Took off and the O2 sensor indication =
completely disappeared from the EM-2 display. Did one circuit of the airpor=
t and landed.</font></div>
<div><font face=3D"Arial" size=3D"2"></font>=A0</div>
<div><font face=3D"Arial" size=3D"2">Discovered that the O2 sensor had fail=
ed (physically -- the top fell off and separated from the body). This cause=
d me to raise the following questions.</font></div>
<div><font face=3D"Arial" size=3D"2"></font>=A0</div>
<div><font face=3D"Arial" size=3D"2">1. I believe that the oxygen sensor re=
adout is only that, not used by the EC-2 for control purposes. </font></div=
>
<div><font face=3D"Arial" size=3D"2">2. When in auto tune, is the EM-2 look=
ing at the sensor for indications of which way to adjust the mixture? If no=
t, what is the feedback mechanism?</font></div>
<div><font face=3D"Arial" size=3D"2"></font>=A0</div>
<div><font face=3D"Arial" size=3D"2">I went to the Auto parts store for a r=
eplacement, and ran into the problem that there are 100&#39;s of different =
oxygen sensors, and they need to know what car it came from. Anyone have th=
e specs on what this sensor is? </font></div>

<div><font face=3D"Arial" size=3D"2"></font>=A0</div><font color=3D"#888888=
">
<div>=A0</div>
<div><font face=3D"Arial" size=3D"2">Bill Schertz<br>KIS Cruiser #4045<br>N=
343BS<br>Phase I testing</font></div></font></div></blockquote></div><br>

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