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Hi Paul, thanks for the info. I failed to mention I also have a heated O2 sensor - so perhaps that is one reason it lasts a bit longer.
Regarding your crazy fuel mixture. I have a friend who has a NA 13B in a GlassStar. He reported the very same problem, but claimed his manifold pressure dropped down to6-7 inch HG when he rapidly closed his throttle at altitude. Wouldn't happen on the ground, just when flying and suddenly closing the throttle.
We speculated that perhaps IF the manifold pressure was really that low, that perhaps the fuel MAP pointer was pointing at a region of memory that was off the fuel map (unlikely) or else it was point at fuel memory locations on the chip that are go normally accessible (and therefore tunable). But, to be honest, he/we don't have a clue as to why it was doing it - it suddenly stopped and my friend doesn't know what he did to make it stop.
I would suggest checking with Tracy, one reason is that his EC2 for the three rotor is a bit different than for the two rotor.
ED
----- Original Message ----- From: <fpbjr2001@yahoo.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Friday, December 29, 2006 10:00 AM
Subject: [FlyRotary] Re: 100LL and O2 sensor
ed
lou and i have changed our o2 sensor to a broad band
preheated type for two reasons. they last longer with
100LL fuel. because it is preheated it keeps more of
the lead off of the sensor. and of coarse you can get
an actual air/fuel ratio reading.
i do have a question. we tuned our engine and it
takes added throttle real smooth but when we pull the
throttle the mixture goes crazy. the engine gets
erratic of course with the mixture all over the place.
any ideas what is going on.
we go to the B side of the ECU and things smooth out
but the air fuel mixtures are not a lot different. we
need a little input.
thanks paul brannon N117ES
--- Ed Anderson <eanderson@carolina.rr.com> wrote:
While leaded fuel will quickly ruin an O2 sensor for
its intended use in
controlling an automobile's fuel CPU, that is not
true for using it as an
Air/Fuel Indicator. I typically get over 150 hours
with an O2 sensor using
100LL 99% of the time, before it slowly becomes
unusable for that purpose. I
am on my second O2 sensor and approaching 360 hours
flight time. The sensor
appears to gradually loose its sensitivity and
responsiveness to changing
air/fuel conditions. Now this pertains to the older
(standard) narrow-band
O2 sensor, I have no experience with the newer (more
accurate and more
expensive) broad-band sensor.
FWIW
Ed
----- Original Message ----- From: "Jeff Owen" <rotary@jeff-owen.name>
To: "Rotary motors in aircraft"
<flyrotary@lancaironline.net>
Sent: Friday, December 29, 2006 12:19 AM
Subject: [FlyRotary] Re: Yet another non-event story
Buly,
Are you using 100LL? Leaded fuel will kill O2
sensors quickly.
If you are running leaded fuel save yourself some
wrenching time by changing
the O2 sensor first.
Jeff Owen
>During the flight I noticed my mixture bar was
going from lean to
>totally desapearing. Turning the knob to full rich
was not enough. So
>I have to do some more tuning.
>Bulent "Buly" Aliev
>FXE Ft lauderdale, FL
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