Kent;
The point of your argument escapes me. It would seem that having three or
four electrodes would make indexing impossible since there would always
be one in the way.
Drive Safely & Good Luck
Ken Lewis<Kernersville,NC>86 VW crewcab;60 T-5 Coupe

On Sat, 30 Jan 1999 09:36:38 -0700 Kent Christensen <lkchris@USWEST.NET>
writes:
>Karl wrote: I think the theory is that whichever electrode
>has the least resistance will
>receive the spark ...
>
>Another theory might be related to the fact old American
>iron hot rodders (and I'm sure others) would "index" plugs,
>whereby they'd use different thickness washers to ensure the
>open end of the ground electrode would face the center of
>the combustion chamber, supposedly maximizing success of
>combustion.  It's also known that mixture properties vary by
>location as the fuel/air mixture enters the combustion
>chamber.  Three-electrode plugs should address these issues
>nicely.
>
>For related info see
>http://www.ca.sandia.gov/CRF/index_4.html
>

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