Pretty good description Ed,
Also look for a darker track from the center electrode to the shell. Of course if you have tracking you will have fouling shortly afterward.
Bill Jepson

-----Original Message-----
From: Ed Anderson <eanderson@carolina.rr.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Mon, 11 Jun 2007 11:23 am
Subject: [FlyRotary] Re: MSD type Ignition CD or not? was Re: Spark Plug Cleaning


Bob, this is what I have observed. The ceramic will be dark colored - dark charcoal - almost black. But, that would probably look that way with carbon fouling also. But, when I shine a strong light on the ceramic cone, light glitters off of what I believe to be lead crystals - if I am correct then that could be a sign of lead fouling. In other words, carbon fouling appears to leave a dull charcoal/black color whereas the lead apparently leaves dark metallic crystals of some sort. That's the best I can conclude. 
 
Ed 
 


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