Return-Path: <13brv3@bellsouth.net> Received: from imf21aec.mail.bellsouth.net ([205.152.59.69] verified) by logan.com (CommuniGate Pro SMTP 4.2b1) with ESMTP id 3140261 for flyrotary@lancaironline.net; Thu, 01 Apr 2004 07:38:40 -0500 Received: from rad ([65.0.137.61]) by imf21aec.mail.bellsouth.net (InterMail vM.5.01.06.08 201-253-122-130-108-20031117) with ESMTP id <20040401123840.RQJT1763.imf21aec.mail.bellsouth.net@rad> for ; Thu, 1 Apr 2004 07:38:40 -0500 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Rusty's O2 / EM2 problems. Date: Thu, 1 Apr 2004 06:40:45 -0600 Message-ID: <00ce01c417e6$8d76da30$6001a8c0@rad> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00CF_01C417B4.42DC6A30" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4510 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 In-Reply-To: Importance: Normal This is a multi-part message in MIME format. ------=_NextPart_000_00CF_01C417B4.42DC6A30 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Greetings, =20 I haven't had a chance to do anything else with my O2 testing, but I've = had an odd thought. =20 =20 The full story, is that I originally had erratic O2 readings with the = rev-2 configuration. Primarily, this was staying on the mid, to low end of = the scale, but would then just go away completely, as if it was way too = lean. I had used the same sensor I used before, but now had the EM-2, rather = than my old mixture gauge. It didn't take long before I noticed that the O2 sensor was falling apart, so it was replaced with the Bosch 11027 sensor that several of you are using. On the next run, the EM-2 read almost = full scale, and I couldn't do much to change it with the mixture knob. I = could hear the engine getting richer and leaner, but the reading stayed near = full scale. The only time it would change was when I leaned so much that the engine was starting to cut out, then it would plunge to nearly zero. =20 =20 I'll be testing the reading with my old mixture gauge very shortly, so = we'll see what that shows, but by all rights, the EM-2 should be giving me a = valid reading. If we assume it's correct, then I'm running so rich, that the = O2 reading is maxed through the whole usable mixture range required to run. = =20 =20 Here's the wild question- Is it possible that the fuel is not = atomizing completely due to the 30" distance from my injectors to the engine, and = some of it is making it through the engine as "droplets". It's hard for me = to believe that could really happen, but it would explain the overly rich = O2 reading. =20 =20 Thanks, Rusty (shouldn't ask questions so early) =20 ------=_NextPart_000_00CF_01C417B4.42DC6A30 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
Greetings,
 
I = haven't had a=20 chance to do anything else with my O2 testing, but I've had an odd=20 thought. 
 
The = full story, is=20 that I originally had erratic O2 readings with the rev-2 = configuration. =20 Primarily, this was staying on the mid, to low end of the scale, but = would then=20 just go away completely, as if it was way too lean.   I had = used the=20 same sensor I used before, but now had the EM-2, rather than my old = mixture=20 gauge.  It didn't take long before I noticed that the O2 sensor was = falling=20 apart, so it was replaced with the Bosch 11027 sensor that several of = you are=20 using.  On the next run, the EM-2 read almost full scale, and = I=20 couldn't do much to change it with the mixture knob.  I could hear = the=20 engine getting richer and leaner, but the reading stayed near full = scale. =20 The only time it would change was when I leaned so much that the = engine was=20 starting to cut out, then it would plunge to=20 nearly zero.  
 
I'll = be testing the=20 reading with my old mixture gauge very shortly, so we'll see what that = shows,=20 but by all rights, the EM-2 should be giving me a valid = reading.  If=20 we assume it's correct, then I'm running so rich, that the O2 reading is = maxed=20 through the whole usable mixture range required to=20 run.  
 
Here's = the wild=20 question-   Is it = possible that=20 the fuel is not atomizing completely due to the 30" distance from = my=20 injectors to the engine, and some of it is making it through the = engine as=20 "droplets".  It's hard for me to believe that could really happen,=20 but it would explain the overly rich O2=20 reading.  
 
Thanks,
Rusty = (shouldn't ask=20 questions so early)   
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