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To: flyrotary@lancaironline.net
Subject: sheilded plug wires
Date: Fri, 08 Jul 2011 20:16:19 -0400
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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?

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

Comments and suggestions invited.

Brian Trubee


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<font color=3D'black' size=3D'2' face=3D'arial'>
<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>

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