One of the things I want to eliminate as a potential cause of  my
high rpm  misfiring is EMI due to unshielded plug  wires. I
currently have Blue Max EMI  shielded plug wires  and just purchased
Magnecor shielded wires. What makes  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 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, with the inner conductor  and spiral wrap
exposed and crimped in  contact with the  terminal ends, doesn't the
spiral wrapped wire also conduct  the  spark current and thereby
defeat the whole purpose?  Isn't the shielding 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    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 each  entire  secondary lead and ground one end of or the other
to provide  shielding.

Comments and suggestions  invited.

 Brian Trubee


There is no shielding. The spiral of Monel wire provides resistance and
inductive reactance. Reactance is a current flow in opposition to the primary
flow. So the outer rim of the halo effect is reduced (radio transmissions).
No  magic at all. Just try it. Assemble the ends as though it was a solid
conductor.  Adding a stainless braid will provide a large area capacitor.
Probably not a  good idea. The Magnacore web page suggests that only they know
about this wire  thing and everyone
else just manufactures crap to steal your money. Who? people like Mallory?
The Magnacore stuff looks just like the Mallory stuff I can buy by the foot
at  the hot rod shop.

Lynn E. Hanover