X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 10 [X] Return-Path: Received: from ms-smtp-04.southeast.rr.com ([24.25.9.103] verified) by logan.com (CommuniGate Pro SMTP 5.1.4) with ESMTP id 1723783 for flyrotary@lancaironline.net; Fri, 29 Dec 2006 11:01:32 -0500 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.103; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-100-190.carolina.res.rr.com [24.74.100.190]) by ms-smtp-04.southeast.rr.com (8.13.6/8.13.6) with SMTP id kBTG0Vm9021952 for ; Fri, 29 Dec 2006 11:00:31 -0500 (EST) Message-ID: <000901c72b62$7a05d360$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: 100LL and O2 sensor Date: Fri, 29 Dec 2006 11:00:35 -0500 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3028 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 X-Virus-Scanned: Symantec AntiVirus Scan Engine 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: To: "Rotary motors in aircraft" 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 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" >> To: "Rotary motors in aircraft" >> >> 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 >> >> >> >> -- >> Homepage: http://www.flyrotary.com/ >> Archive and UnSub: >> http://mail.lancaironline.net/lists/flyrotary/ >> >> >> -- >> Homepage: http://www.flyrotary.com/ >> Archive and UnSub: >> http://mail.lancaironline.net/lists/flyrotary/ >> > > > __________________________________________________ > Do You Yahoo!? > Tired of spam? Yahoo! Mail has the best spam protection around > http://mail.yahoo.com > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/