Miata Mailing List: July 1993, Message #138
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   From: Herb Samuels 
Subject: NGK Platinum Plugs
   Date: Thu, 15 Jul 1993 11:46:06 -0400


The following was sent again since a message indicated that the
first one didn't go through.

The use of platinum plugs in the Miata may have been discussed before.
What prompted this post is an advertisement from Rod Millen suggesting
the use of NGK Platinum plugs for the Miata. I had replaced the stock
plugs with Splitfires about 7,000 miles ago which gave a slight
improvment in drivability.  However, it was always rough in the upper
RPM ranges.  I know someone else with the same problem and they
replaced the Splitfire plugs with standard NGK plugs (not platimum)
which markedly improved the high RPM vibration of the engine.  The NGK
plugs are reccommended as replacement plugs in the Miata Shop Manual
(don'tremembwer the number but they end in tne number 7).  I am thinking
of replacing the Splitfire plugs with these standard NGK plugs but
wondered if the NGK Platimum plugs might be better.  In particular, I
am also considering installing a BBR turbo conversion and wonder if
the platinum plugs would also be better with the turbo driven engine.

Is it all hype or do the platinum plugs give higher performance
(exclusive of longevity)?

Herb Samuels