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References: <list-5046203@logan.com>
To: flyrotary@lancaironline.net
Subject: Re: [FlyRotary] sheilded plug wires
Date: Fri, 08 Jul 2011 20:25:25 -0400
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My last massage got a little garbled, the way I have my wires configured=
 now, the conductor and spiral wrap are exposed and folded under the crimp=
ed teminal ends, so aren't both the conductor and the spiral wrap acting=
 as 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 misfiring=
 is EMI due to unshielded plug wires. I  currently have Blue Max EMI sheil=
deieplug wires and just purchased Magnecor shiedled wires. What makes thes=
e "shielded"? They have a conductor with a very thin wire wrapped around=
 the insulation of the core wire, and that is covered by another insulatin=
g layer, and that is covered with the outer sheath. But,my understanding=
 is that the spiral wrapped wire is supposed 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 shield=
ing wire supposed to be grounded at one end to the engine and drain off an=
y induced current from the high voltage secondary ignition lead, and be se=
parate and not in contact with the conductor? 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 wrapped shielding wire?
=20
Alternatively, I do have some heavy braided wire that I could slip over ea=
ch entire secondary lead and ground one end of or the other to provide shi=
elding.=20
=20
Comments and suggestions invited.
=20
Brian Trubee
=20
=20
=20

=20
=20


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<font color=3D'black' size=3D'2' face=3D'arial'>
<div>My last massage got a little garbled, the way I have my wires configu=
red now, the conductor and spiral wrap are exposed and folded under the cr=
imped teminal ends, so aren't both the conductor and the spiral wrap actin=
g as a conductor? What is doing the shielding?</div>


<div>&nbsp;</div>


<div>Brian Trubee<br>
<br>
</div>


<div style=3D"CLEAR: both"></div>
<br>
<br>


<div style=3D"FONT-FAMILY: arial,helvetica; COLOR: black; FONT-SIZE: 10pt"=
>-----Original Message-----<br>
From: bktrub@aol.com<br>
To: Rotary motors in aircraft &lt;flyrotary@lancaironline.net&gt;<br>
Sent: Fri, Jul 8, 2011 5:16 pm<br>
Subject: [FlyRotary] sheilded plug wires<br>
<br>


<div id=3DAOLMsgPart_2_dfed5be0-8dde-41cc-b22f-ffc65c699d81><FONT color=3D=
black size=3D2 face=3Darial>

<div>One of the things I want to eliminate as a cause of my high rpm misfi=
ring is EMI due to unshielded plug wires. I&nbsp; currently have Blue Max=
 EMI sheildeieplug wires and just purchased Magnecor shiedled wires. What=
 makes these "shielded"? They have a conductor with a very thin wire wrapp=
ed around the insulation of the core wire, and that is covered by another=
 insulating layer, and that is covered with the outer sheath. But,my under=
standing is that the spiral wrapped wire is supposed to shield the inner=
 wire, and&nbsp;the way I have it configured, doesn't&nbsp;the spiral wrap=
ped wire also conduct the spark current and thereby defeat the whole purpo=
se? Isn't the shielding wire supposed to be grounded at one end to the eng=
ine and drain off any induced current from the high voltage secondary igni=
tion lead, and be separate and not in contact with the conductor?&nbsp;And=
 if that is the case, how am&nbsp; I supposed to configure or fabricate th=
e terminals&nbsp;in such a way as&nbsp;to ground the spiral wrapped shield=
ing wire?</div>


<div>&nbsp;</div>


<div>Alternatively, I do have some heavy braided wire that I could slip ov=
er&nbsp;each entire secondary lead and ground one end of or the other to=
 provide shielding. </div>


<div>&nbsp;</div>


<div>Comments and suggestions invited.</div>


<div>&nbsp;</div>


<div>Brian Trubee</div>


<div>&nbsp;</div>


<div>&nbsp;</div>


<div>&nbsp;</div>


<div><br>
&nbsp;</div>


<div style=3D"CLEAR: both">&nbsp;</div>
</FONT></div>
<!-- end of AOLMsgPart_2_dfed5be0-8dde-41cc-b22f-ffc65c699d81 --></div>
</font>

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