REFLECTOR: automotive spark plug harness

[Douglas Holub]

Thanks. That was news to me.  I got some automotive spark plug adapters from Great Plains.  They provide that return path to the magneto.
  ----- Original Message ----- 
  From: Brian Michalk 
  To: Velocity Aircraft Owners and Builders list 
  Sent: Wednesday, May 29, 2013 5:33 PM
  Subject: Re: REFLECTOR: automotive spark plug harness


  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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