Don't know, Tim.  The conventional wisdom is that NA engines (I have a turbo
block but no turbo) are really not susceptible to detonation.  Besides that
the B9EGV is a racing plug (states it on the box) and of course they are
designed to run much colder than a normal plug.  However, I could find no
evidence of FOD other than that caused by the broken piece of apex seal.

Ed A
----- Original Message -----
From: "Tim Andres" <tim2542@sbcglobal.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Tuesday, April 12, 2005 10:23 AM
Subject: [FlyRotary] Re: Latest on the Motor Trouble


> Ed Anderson wrote:
>
> > But, clearly something took out the apex seals on #1, no question
> > about that when one of them is in three pieces.  Its beginning to look
> > less likely that the spark plugs were responsible - just a coincident
> > on the timing.
>
> Ed is it possible detonation caused this? If I understand correctly you
> had the wrong plugs installed, perhaps a heat range issue with the
> plugs. Actually this would then be preignition.
>                          Tim Andres
>
>
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