From: "Marvin Kaye" <marv@lancaironline.net>
Subject: Re: [FlyRotary] Plug wear
To: flyrotary
Date: Sun, 13 Apr 2003 17:22:57 -0400
Message-ID: <web-2121220@logan.com>
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Posted for "Ed Anderson" <eanderson@carolina.rr.com>:

Bill,
      I get between 25-35 hours on 100 LL.  I believe that the misfiring you 
detect is more related to lead coating the ceramic center cone and bleeding 
off enough of the ignition pulse before it can build sufficiently to jump the 
air gap.  Tracy gets approx 100 hours using no-lead and that is the only 
difference between our set ups.

      I acquired a spark plug cleaner at Sun & Fun and intend to clean some of 
the old plugs that exibited the SAG and see if that makes any difference. 

    Regarding Plugs, early-on I tried a spark plug with a single ground 
electrode and they were totally destroyed (not just worn) within 10 hours. 
  Ian showed some plugs that make yours look like they were brand new (I mean 
some of his had the electrode - gone, missing, not there) and his engine still 
ran.  I think that may also indicate that "Lead Posioning" may be the 
principal reason the plugs start to miss rather than wear on the electrode.

   Great looking aircraft!  Did you get the URL I sent on the Austrialian 
Turbos?

Ed Anderson