Steve,
You did that in only 15 hours!?
Those plugs look like they were too lean.  They are pitted and the electrode
is pitted as well. On the NGK site

.Over-advanced ignition timing
.Fuel octane rating too low (knock is present)
.Excessively lean air-fuel mixture
How much boost are you running?

Bill B

-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of sboese
Sent: Tuesday, July 07, 2009 5:05 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Emailing: rotor 2 leading, rotor 2 leading b

Ed,

Here are two pictures of a plug removed after 15 hours of use, half with
100LL.  All the plugs look very similar.  Does this plug look typical to you
and satisfy your definition of "no discernable wear"?  I'm just trying to
satisfy myself that I'm not seeing something anomolous.

Steve Boese