[Joe Hull]
    I'm a little behind on email...
    But, the question was asked, "how many hours on the spark plugs?"  These
    plugs had about 20 to 25 hours on them. Also, it was a BR9EQ - only
    one step
    away from the coldest plug - if I understand Jim Mederer's chart
    correctly.

    Thanx,
    Joe Hull
    Redmond, Wa  - Cozy Mark-IV, 71Hrs



Thanks Joe.. That's interesting.

I wonder if there was something else wrong with the plug to start with.


Matt-

This is just pure speculation on my part.  I'll bring it up and let more
knowledgeable people discuss it, let me know if I'm wrong.

From the photo you sent out awhile back I thought the failed plug
looked like a 1st gen RX7 1984, 1985 13B BR9EQ plug.

I had one break just installing it in a 1st gen engine several years
ago. The BUR 2nd gen plugs plugs seem more robust. Also, a broken
ceramic would have trouble getting past the four ground electrodes on
the BUR plug.

Maybe Atkins prefers the 1st gen plugs for some reason, and that's why
Joe's 13B engine had them installed?

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