Miata Mailing List: July 1993, Message #141
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   From: Andy Poling 
Subject: Re: NGK Platinum Plugs
   Date: Thu, 15 Jul 1993 12:10:28 -0400


On Thu, 15 Jul 1993, Herb Samuels wrote:
> 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.

Aside from the usual longevity improvement, I think (though I could be
wrong on this) that (at least with Bosch's platinum design) you gain a
wider heat range too.  Could it have something to do with the reduced
thermal mass of the center conductor?

If so, that might be an advantage in a supercharged engine (especially a
turbocharger).

-Andy (techno geek wannabee...)