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Date: Sun, 03 Oct 2010 17:45:32 -0500
From: Charlie England <ceengland@bellsouth.net>
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To: flyrotary <flyrotary@lancaironline.net>
Subject: SAG (spark plug info)
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http://www.tomorrowstechnician.com/Content/Site301/SmartProducts/RotaryEnginesTe_00000001985.pdf
Just stumbled upon this document describing Renesis changes; one of the 
things mentioned is the change in spark plugs. Looks like Mazda was 
concerned about plug tip temps, even on street engines.

Charlie


Micro-electrode spark plugs
The last technology employed in aid of fuel economy for
the RENESIS engine is the micro-electrode spark plug.
This spark plug uses a small side electrode and thick
gauge central electrode with an extremely fine tip that
promotes stable ignition of lean air-fuel mixtures. Also,
by maintaining a lower temperature for side and central
electrodes, the plug achieves high heat-resistance. The
tip of the central electrode, which was previously platinum,
is now made of longer-lasting iridium.