X-Junk-Score: 0 [] X-Cloudmark-Score: 0 [] X-Cloudmark-Analysis: v=2.3 cv=EuKsUhUA c=1 sm=1 tr=0 a=/8lhovTQVRG6fS2jihtHjg==:117 a=x7bEGLp0ZPQA:10 a=A-0mRrAPPO4A:10 a=reM5J-MqmosA:10 a=_6GpL_ENAAAA:8 a=on22okXAAAAA:8 a=Ia-xEzejAAAA:8 a=7g1VtSJxAAAA:8 a=upe9VTnjyBBs0mK5N4gA:9 a=QEXdDO2ut3YA:10 a=Qa1je4BO31QA:10 a=gvSQh4r-fQ0A:10 a=o0o1IIkXG2-ub5f69PgA:9 a=djddMoAfMOYCydgN:21 a=NPqpj5bUEVj9vR1HIonK:22 a=Urk15JJjZg1Xo0ryW_k8:22 a=grOzbf7U_OpcSX4AJOnl:22 From: "Charlie England ceengland7@gmail.com" Received: from mail-io1-f51.google.com ([209.85.166.51] verified) by logan.com (CommuniGate Pro SMTP 6.2.14) with ESMTPS id 706938 for flyrotary@lancaironline.net; Tue, 01 Sep 2020 09:52:30 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.166.51; envelope-from=ceengland7@gmail.com Received: by mail-io1-f51.google.com with SMTP id b16so1285404ioj.4 for ; Tue, 01 Sep 2020 06:52:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to; bh=uIX8gnT5nZZRM7HTbjOja9JJcqRkCzaQRCVkEDkYprA=; b=SEX0FjoJ+KoriAT4YlO+OGvW1MVxjP5h20GXuVJzh+RWbqb+rUgi+Hn5zHy5EHIveP RTb/CmQoKPKPk0IkkAX2NjMcoOFHcQ7Grocpoh5dgpsRbkeezzB+tzLaE6VW/JEM4V5a O/EpMShAJEs97PXL/KZIF4QUrM3hagQ8Kv7tGK0d6oEvh0qxCpwKeoL2oYKViyCREnu4 Sfv7yJeZrfRuleDGCMQBLQUxrQsYL7pC23JpG4TQd3uUNfkjfwxIDx9Xp7ovpZvYWdsG tdL0Wq9MdunwXdG8lG0ffqtMZ6IyJ/sLv5d/cctV3dQFbaQ0Jk8WTL8SeNbtmULs41pL xtlQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to; bh=uIX8gnT5nZZRM7HTbjOja9JJcqRkCzaQRCVkEDkYprA=; b=kXoDRF7owIElLXVEDX/s9zt7hzFL1qGzc9IhqN8Qu2418JmtIb+nm03IegAGfE6KQM lu8gFsoK/lbvV1L+OrTne0K82S8kDUzGY+2EvAFKntvSlWZWyobr/XvW+3HIkq4XE+eC m/Tci2Q/HuqWwHprM9YqGZHV640Hr4/Q4kHQhJPjEI5Dz702DgO/dcidOsXak8i4yHSI vjpnGuyG3QQD9c5ewMJiKttgjZ1aOaARD0xfXdmtZZDiIczfibA0v4yACBKlA2izhQ/q hfWknZ4QFoc4myBSdPepWsw7BFC9ib9FjRnCZN6mCFbhcUutC7HkFvMEgbFaB50i6VqG iijw== X-Gm-Message-State: AOAM530PUfMo+UnHd4P08jcKSdFeqDfNOfK2DOLZGOzZRHe75fi0qyPb TtpHKC/cdDt88zR1gyxklhOuD5HHfnrtE2A+Oh/nkvLQ X-Google-Smtp-Source: ABdhPJyvS2v7fZYxmestyPMQxt1+aGqx3U0tc+fBLAOS3cBCf/YIhc2joaN4/4PV5va2zVs8f4Kf7oWc1ZymIdpPQUw= X-Received: by 2002:a5e:9e0a:: with SMTP id i10mr1536375ioq.41.1598968332941; Tue, 01 Sep 2020 06:52:12 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: Date: Tue, 1 Sep 2020 08:50:15 -0500 Message-ID: Subject: Re: [FlyRotary] Re: Spark Plug SAG and Electrical Interference To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary="0000000000007dff0305ae40d33b" --0000000000007dff0305ae40d33b Content-Type: text/plain; charset="UTF-8" Don't forget that when we change something, we often change something. (Else.). :-) Since power wasn't affected, the safe and real test would be to re-install the plugs and fly. Same problem: almost certainly bad plugs. No problem: likely either you cleaned up a bad connection somewhere, or the ignition system had moisture on/around it, that got baked out well by the time the engine cooled off after the last problem flight. Which would drive me to close inspection of all terminations, coil housings, etc. Charlie Virus-free. www.avast.com <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> On Tue, Sep 1, 2020 at 8:37 AM Jeff Whaley jwhaley@datacast.com < flyrotary@lancaironline.net> wrote: > Hi Steve, I checked all four plugs and initially they would measure high > impedance (Mega Ohms) but as I forced the fine tip of the probe through the > carbon build-up they all measured slightly over 4000 Ohms, so they have not > gone open-circuit but do have carbon deposits, though nothing unusual for a > plug with about 50 hours operating time. I'm not going to toss them in the > garbage just yet, actually will give them a thorough cleaning and maybe try > them again later - for now I'm sticking with the noise-free ones. > Jeff > > -----Original Message----- > From: Jeff Whaley > Sent: August-31-20 8:14 AM > To: Rotary motors in aircraft > Subject: Re: [FlyRotary] Spark Plug SAG and Electrical Interference > > Thanks Steve, so the plug itself is acting like a mini antenna ... I can > easily check the resistance from end to end and measure some other plugs > lying around. > Yes, there was no SAG - engine was making normal power. > > Jeff, > > I have gotten RF interference from resistor type spark plugs including > BR10EIX when the internal resistor element fails and an arc occurs > internally. This can be verified by checking the resistance between the > center electrode tip and the end where the spark plug wire attaches. The > resistance should be in the neighborhood of 5000 ohms with a good plug and > infinite or open circuit on one that has failed. > > My experience is that this type of failure is unrelated to SAG. > > Steve Boese > > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: > http://mail.lancaironline.net:81/lists/flyrotary/List.html > --0000000000007dff0305ae40d33b Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Don= 't forget that when we change something, we often change something. (El= se.). :-)

<= /div>
Since power was= n't affected, the safe and real test would be to re-install the plugs a= nd fly. Same problem: almost certainly bad plugs. No problem: likely either= you cleaned up a bad connection somewhere, or the ignition system had mois= ture on/around it, that got baked out well by the time the engine cooled of= f after the last problem flight. Which would drive me to close inspection o= f all terminations, coil housings, etc.

Charlie

3D"" Virus-free. www.avast.com

On Tue, Sep 1, 2020 at 8:37 AM Jeff Whaley jwhaley@datacast.com <flyrotary@lancaironline.net> wrote:
Hi Steve, I checked all fou= r plugs and initially they would measure high impedance (Mega Ohms) but as = I forced the fine tip of the probe through the carbon build-up they all mea= sured slightly over 4000 Ohms, so they have not gone open-circuit but do ha= ve carbon deposits, though nothing unusual for a plug with about 50 hours o= perating time.=C2=A0 I'm not going to toss them in the garbage just yet= , actually will give them a thorough cleaning and maybe try them again late= r - for now I'm sticking with the noise-free ones.
Jeff

-----Original Message-----
From: Jeff Whaley
Sent: August-31-20 8:14 AM
To: Rotary motors in aircraft
Subject: Re: [FlyRotary] Spark Plug SAG and Electrical Interference

Thanks Steve, so the plug itself is acting like a mini antenna ... I can ea= sily check the resistance from end to end and measure some other plugs lyin= g around.
Yes, there was no SAG - engine was making normal power.

Jeff,

I have gotten RF interference from resistor type spark plugs including BR10= EIX when the internal resistor element fails and an arc occurs internally.= =C2=A0 This can be verified by checking the resistance between the center e= lectrode tip and the end where the spark plug wire attaches.=C2=A0 The resi= stance should be in the neighborhood of 5000 ohms with a good plug and infi= nite or open circuit on one that has failed.

My experience is that this type of failure is unrelated to SAG.

Steve Boese


--
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