X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from cdptpa-omtalb.mail.rr.com ([75.180.132.121] verified) by logan.com (CommuniGate Pro SMTP 5.2c1) with ESMTP id 2570717 for flyrotary@lancaironline.net; Fri, 07 Dec 2007 09:18:49 -0500 Received-SPF: pass receiver=logan.com; client-ip=75.180.132.121; envelope-from=eanderson@carolina.rr.com Received: from edward2 ([24.74.103.61]) by cdptpa-omta01.mail.rr.com with SMTP id <20071207141808.YSNW27254.cdptpa-omta01.mail.rr.com@edward2> for ; Fri, 7 Dec 2007 14:18:08 +0000 Message-ID: <000701c838db$b9dfbbe0$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" Subject: wide band O2 sensor Date: Fri, 7 Dec 2007 09:16:14 -0500 MIME-Version: 1.0 Content-Type: multipart/related; type="multipart/alternative"; boundary="----=_NextPart_000_0003_01C838B1.D0D2C560" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3138 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3138 This is a multi-part message in MIME format. ------=_NextPart_000_0003_01C838B1.D0D2C560 Content-Type: multipart/alternative; boundary="----=_NextPart_001_0004_01C838B1.D0D2C560" ------=_NextPart_001_0004_01C838B1.D0D2C560 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I don't know whether anybody is using or contemplating using a wide band = sensor for Air/Fuel ratio indications. I've looked into it and could = find no advantage (for my usage) that would justify the additional cost. = Apparently there is a "simulated narrowband output" which I was unaware = of. =20 But, here are a few other considerations that you might want to think = about: at this URL :=20 http://www.techedge.com.au/vehicle/wbo2/default.htm Wideband Sensor Positioning The wideband sensor must be carefully placed in order to prevent damage = to the sensor itself and to maximise accuracy. Also, if you use the = sensor's output directly (via the simulated narrowband output) to drive = your ECU then you should be doubly careful. Please follow all of these = "rules" :=20 a.. The sensor should always be placed on the engine side of a = catalytic converter, unless you are testing the effectiveness of the = convertor itself.=20 b.. The gas temperature to the sensor should never exceed 850 degrees = C (about 1560 degrees Fahrenheit).=20 c.. The sensor should never be run without power to the WB unit (a hot = sensor burns off carbon residues)=20 d.. Always have the long axis of the sensor perpendicular to the gas = flow (stops sensor clogging)=20 e.. Position the sensor vertically or at most between 10 o'clock to = the 2 o'clock position (this avoids cracking the internal ceramic = structure should moisture condense internally)=20 f.. We don't recommend using a short sections of exhaust pipe shoved = up your tailpipe. A specially welded additional bung is the best = mounting strategy.=20 The sensor reads the partial pressure of gases in the exhaust and infers = the AFR, rather than by measuring some magical AFR directly. This may be = an issue on forced induction, and in particular, on turbo-charged = engines.=20 a.. AFRs will indicate richer than they are, causing you to run leaner = than you think.=20 b.. Lean AFR's will be richer (or less lean) than indicted.=20 A solution is to ensure you locate your sensor away from the turbo, and = certainly on the exhaust (low pressure) side of the turbo rather than = the engine side.=20 =20 Ed Anderson Rv-6A N494BW Rotary Powered Matthews, NC eanderson@carolina.rr.com http://www.andersonee.com http://members.cox.net/rogersda/rotary/configs.htm#N494BW http://www.dmack.net/mazda/index.html ------=_NextPart_001_0004_01C838B1.D0D2C560 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

I don't know whether anybody is using or = contemplating=20 using a wide band sensor for Air/Fuel ratio indications. I've = looked into=20 it and could find no advantage (for my usage) that would justify the = additional=20 cost. Apparently there is a "simulated narrowband output" = which I was=20 unaware of.

But, here are a few other considerations that = you might=20 want to think about:

at this URL :

http://www.t= echedge.com.au/vehicle/wbo2/default.htm

Wideband Sensor Positioning

The wideband sensor must be carefully placed in order to = prevent=20 damage to the sensor itself and to maximise accuracy. Also, = if you=20 use the sensor's output directly (via the simulated narrowband = output) to=20 drive your ECU then you should be doubly careful. Please follow all of = these=20 "rules" :

The sensor should always be placed on the engine side of a = catalytic=20 converter, unless you are testing the effectiveness of the convertor = itself.=20
The gas temperature to the sensor should never exceed 850 = degrees=20 C (about 1560 degrees Fahrenheit).=20
The sensor should never be run without power to the WB unit = (a hot=20 sensor burns off carbon residues)=20
Always have the long axis of the sensor perpendicular to = the gas=20 flow (stops sensor clogging)=20
Position the sensor vertically or at most between 10 = o'clock to the=20 2 o'clock position (this avoids cracking the internal ceramic = structure=20 should moisture condense internally)=20
We don't recommend using a short sections of exhaust pipe = shoved=20 up your tailpipe. A specially welded additional bung is the = best=20 mounting strategy.

The sensor reads the partial pressure of gases in the exhaust and = infers the=20 AFR, rather than by measuring some magical AFR directly. This may be an = issue on=20 forced induction, and in particular, on turbo-charged = engines.=20

AFRs will indicate richer than they are, causing you to run leaner = than=20 you think.=20
Lean AFR's will be richer (or less lean) than indicted.

A solution is to ensure you locate your sensor away from the turbo, = and=20 certainly on the exhaust (low pressure) side of the turbo rather than = the engine=20 side.

3D"Palm

Ed Anderson
Rv-6A N494BW Rotary = Powered
Matthews,=20 NC
eanderson@carolina.rr.comhttp://www.andersonee.com
http:/= /members.cox.net/rogersda/rotary/configs.htm#N494BW
http://www.dmack.net/mazda= /index.html

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