REFLECTOR: automotive spark plug harness

[Brian Michalk]

One nice feature of aviation plug harnesses is that they are shielded 
and provide the current return path.  You may get a lot of noise doing 
it that way, but I have seen a kit that lets you use an automotive plug 
that integrates a plug boot into a shielded high tension lead.

On an automobile ... well, now I'm talking about previous generation.  
New autos now use coil-on-plug.  Step back to the previous design which 
is coil packs.  Almost all of those are "wasted spark", and you can tell 
if there are two poles per pack. With a wasted spark system, the 
electrons go down one spark plug wire, made a spark at the plug, then go 
through the engine block to the other plug, made a spark there, then 
travel back up the wire to the coil.

On a magneto, the spark current never goes into the engine block. If you 
do it using your method, make sure there is a reliable current return 
path from the base of the spark plug back to the magneto case.

On 5/29/2013 4:22 PM, Douglas Holub wrote:
> My ECI IOX-360 has 14 mm bosses for automotive spark plugs.  I had two 
> electronic ignitions, but I replaced one of the electronic ignitions 
> with a magneto.  (Mostly because one of the Plasma III's quit working 
> in flight.)  Can I just cut the ends off of the magneto harness and 
> crimp automotive type boots on the ends?
>
> Doug Holub
>
>
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