X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from aspensprings.uwyo.edu ([129.72.10.32] verified) by logan.com (CommuniGate Pro SMTP 5.4.0) with ESMTPS id 5046339 for flyrotary@lancaironline.net; Fri, 08 Jul 2011 23:08:07 -0400 Received-SPF: none receiver=logan.com; client-ip=129.72.10.32; envelope-from=SBoese@uwyo.edu Received: from ponyexpress-ht4.uwyo.edu (extlb.uwyo.edu [172.26.4.4]) by aspensprings.uwyo.edu (8.14.4/8.14.4) with ESMTP id p6937Sxm012987 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL) for ; Fri, 8 Jul 2011 21:07:28 -0600 (MDT) (envelope-from SBoese@uwyo.edu) Received: from ponyexpress-m10.uwyo.edu ([fe80::60dd:cb9e:6f71:3d48]) by ponyexpress-ht4.uwyo.edu ([fe80::8de7:b225:a85b:d0ee%13]) with mapi id 14.01.0289.001; Fri, 8 Jul 2011 21:07:27 -0600 From: "Steven W. Boese" To: Rotary motors in aircraft Subject: RE: [FlyRotary] Re: sheilded plug wires Thread-Topic: [FlyRotary] Re: sheilded plug wires Thread-Index: AQHMPc7UONthrhwlC0mBAoXehOgnN5TjTh3U Date: Sat, 9 Jul 2011 03:07:27 +0000 Message-ID: <3E8191F276108F4481AB0721BBA9269E05814E71@ponyexpress-m10.uwyo.edu> References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [75.244.253.178] Content-Type: multipart/alternative; boundary="_000_3E8191F276108F4481AB0721BBA9269E05814E71ponyexpressm10u_" MIME-Version: 1.0 --_000_3E8191F276108F4481AB0721BBA9269E05814E71ponyexpressm10u_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Brian, I do not know the mechanism that results in the shielding properties. I do= know that when I installed the Magnecor wires configured as you describe, = the interference problems I had were eliminated. Steve Boese ________________________________ From: Rotary motors in aircraft [flyrotary@lancaironline.net] on behalf of = bktrub@aol.com [bktrub@aol.com] Sent: Friday, July 08, 2011 6:25 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: sheilded plug wires My last massage got a little garbled, the way I have my wires configured no= w, the conductor and spiral wrap are exposed and folded under the crimped t= eminal ends, so aren't both the conductor and the spiral wrap acting as a c= onductor? What is doing the shielding? Brian Trubee -----Original Message----- From: bktrub@aol.com To: Rotary motors in aircraft Sent: Fri, Jul 8, 2011 5:16 pm Subject: [FlyRotary] sheilded plug wires One of the things I want to eliminate as a cause of my high rpm misfiring i= s EMI due to unshielded plug wires. I currently have Blue Max EMI sheildei= eplug wires and just purchased Magnecor shiedled wires. What makes these "s= hielded"? They have a conductor with a very thin wire wrapped around the in= sulation of the core wire, and that is covered by another insulating layer,= and that is covered with the outer sheath. But,my understanding is that th= e spiral wrapped wire is supposed to shield the inner wire, and the way I h= ave it configured, doesn't the spiral wrapped wire also conduct the spark c= urrent and thereby defeat the whole purpose? Isn't the shielding wire suppo= sed to be grounded at one end to the engine and drain off any induced curre= nt from the high voltage secondary ignition lead, and be separate and not i= n contact with the conductor? And if that is the case, how am I supposed t= o configure or fabricate the terminals in such a way as to ground the spira= l wrapped shielding wire? Alternatively, I do have some heavy braided wire that I could slip over eac= h entire secondary lead and ground one end of or the other to provide shiel= ding. Comments and suggestions invited. Brian Trubee --_000_3E8191F276108F4481AB0721BBA9269E05814E71ponyexpressm10u_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Brian,

I do not know the mechanism that results= in the shielding properties. I do know that when I installed the Mag= necor wires configured as you describe, the interference problems I had wer= e eliminated.

Steve Boese

From: Rotary motors in aircraft [flyrotary= @lancaironline.net] on behalf of bktrub@aol.com [bktrub@aol.com]
Sent: Friday, July 08, 2011 6:25 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: sheilded plug wires

My last massage got a little garbled, the way I have my wires configur= ed now, the conductor and spiral wrap are exposed and folded under the crim= ped teminal ends, so aren't both the conductor and the spiral wrap acting a= s a conductor? What is doing the shielding?

Brian Trubee

= -----Original Message-----
From: bktrub@aol.com
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Fri, Jul 8, 2011 5:16 pm
Subject: [FlyRotary] sheilded plug wires

One of the things I want to eliminate as a cause of my high rpm misfir= ing is EMI due to unshielded plug wires. I currently have Blue Max EM= I sheildeieplug wires and just purchased Magnecor shiedled wires. What make= s these "shielded"? They have a conductor with a very thin wire wrapped around the insulation of the core wire, and = that is covered by another insulating layer, and that is covered with the o= uter sheath. But,my understanding is that the spiral wrapped wire is suppos= ed to shield the inner wire, and the way I have it configured, doesn't the spiral wrapped wire also conduc= t the spark current and thereby defeat the whole purpose? Isn't the shieldi= ng wire supposed to be grounded at one end to the engine and drain off any = induced current from the high voltage secondary ignition lead, and be separate and not in contact with the condu= ctor? And if that is the case, how am I supposed to configure or= fabricate the terminals in such a way as to ground the spiral wr= apped shielding wire?

Alternatively, I do have some heavy braided wire that I could slip ove= r each entire secondary lead and ground one end of or the other to pro= vide shielding.

Comments and suggestions invited.

Brian Trubee

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