|Posted: Tue Jul 24, 2018 8:36 am Post subject: Spark plug wire installation - distance between wires
At 01:45 AM 7/24/2018, you wrote:
I've always heard that spark plug wires need some small distance between them, and that's what I did on my engine, but I'm curious what happens if you don't have distance between them.Â I've seen several certified aircraft where the wires were just zip tied together with no spacing, and they seem to fly.Â
Example I just saw on Reddit:
I cannot imagine the physics supporting such an
assertion. Engines running legacy magnetos are
generally fitted with shielded plug wires. Two
wires tied to each other are DOUBLE shielded
for what ever effect the writer is hypothesizing.
Modern electronic ignitions can use automotive
unshielded wire . . . so without shielding, what
is the effect of having two or more wires running
in close parallel for some distance?
Electrostatic coupling (the physics thingy that
calls for shielding) is very weak. The energy
coupled between adjacent wires is a tiny fraction
of that flowing in the wire from ignition source
to the plug . . .
Lacking competent analysis and/or repeatable
demonstrations of deleterious effect, I'll bet
this is yet another ol' hangar yarn . . .
Bob . . .
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