X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-oa0-f50.google.com ([209.85.219.50] verified) by logan.com (CommuniGate Pro SMTP 6.0.6) with ESMTPS id 6431963 for flyrotary@lancaironline.net; Sun, 18 Aug 2013 21:04:09 -0400 Received-SPF: none receiver=logan.com; client-ip=209.85.219.50; envelope-from=andrew@martinag.com.au Received: by mail-oa0-f50.google.com with SMTP id i4so4849646oah.37 for ; Sun, 18 Aug 2013 18:03:33 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:content-type; bh=f5Th3woQqGAn8lYOH8Y74/Gk1BuE7YhRoSnLjVwRXbw=; b=SiyDnRJbaC20CAMQuZ6WJuYXogvsTq03VDDnMtIOJv2WDOU4nPXu/CoU3xhroOv98a yivThY3GQa85D+jKuII3cJvbj/h2O10ABry0KRzwmIwBYCPl1AR2am9Iub4bCNCgd6Ye U/nj6ikUAV6Dt3vVsYEW0dxqR028+Rg+czypa5dSbMlLqsE8mMr3wSTjRLvmZdgsAEtv 25j5T3YwtovxuE74HckJCVRAZLWCXwYgk3XjsOxcwKC0MHn0Fw4S0BmKOpW6Q3R6P01q IbwHt+WAmkT6+f05rSHJlK+huHYxzZnCNyH7aQRiHG804jLZT+WwnJnprRBJRmpvadOn F4HQ== X-Gm-Message-State: ALoCoQkwZH5ys5+bxoRp2OKZORUOH/TTWrX+YzWwH6ljFOYL9wcop7vKVws4AeRbZBWhQLUajgO6 MIME-Version: 1.0 X-Received: by 10.182.181.34 with SMTP id dt2mr10146279obc.30.1376874213623; Sun, 18 Aug 2013 18:03:33 -0700 (PDT) Received: by 10.76.80.161 with HTTP; Sun, 18 Aug 2013 18:03:33 -0700 (PDT) X-Originating-IP: [202.40.0.40] In-Reply-To: References: Date: Mon, 19 Aug 2013 09:03:33 +0800 Message-ID: Subject: Re: [FlyRotary] Oxygen Sensor ground From: Andrew Martin To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary=089e0122aa24675bb304e4428246 --089e0122aa24675bb304e4428246 Content-Type: text/plain; charset=ISO-8859-1 Thanks Dennis I'll try that also, I've been wondering about this as my O2 sensor seemed really sensitive. using a single wire Bosch and reading on the EM2 goes from full rich to full fine with very small movement of the mixture. hope adding the earth helps as fine tuning has been difficult, so far been doing tuning more by ear, but hard to do the fine settings. I was thinking that because I have a very short exhaust pipe from the header(no muffler) that I may have had air reaching the sensor between exhaust pulses. Regards Andrew Martin On Mon, Aug 19, 2013 at 6:23 AM, Dennis Havarlah wrote: > ** > My single wire O-2 sensor data has been wandering up and down during > flight lately. I finally decided to add a ground wire to the sensor case > and that fixed it. The sensor uses the exhaust pipe as it's ground. I > used a stainless steel screw type hose clamp to hold the wire on the shell > of the sensor. > > Dennis H. > --089e0122aa24675bb304e4428246 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable

Thanks Dennis

I'll try that also, I= 've been wondering about this as my O2 sensor seemed really sensitive. = using a single wire Bosch and reading on the EM2 goes from full rich to ful= l fine with very small movement of the mixture. hope adding the earth helps= as fine tuning has been difficult, so far been doing tuning more by ear, b= ut hard to do the fine settings.

I was thinking that because I have a very short exhaust pipe from the= header(no muffler) that I may have had air reaching the sensor between exh= aust pulses.

Regards<= br>
Andrew Martin

On Mon, Aug 19, 2013 at 6:23 AM, Dennis = Havarlah <clouduster@austin.rr.com> wrote:

My single wire O-2 sensor data has been wandering= =20 up and down during flight lately.=A0 I finally decided to add a ground wire= =20 to the sensor case and that fixed it.=A0 The sensor uses the exhaust pipe a= s=20 it's ground.=A0 I used a stainless steel screw type hose clamp to hold = the=20 wire on the shell of the sensor.

=A0

Dennis H.

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