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Old November 17th 06, 09:10 PM posted to rec.autos.makers.ford.explorer
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Default '98 Explorer V8 Spark Plug Replacement?


oklaman wrote:
> somewhere I read (wish I could remember where) that double tip platinum's
> were not really any better than regular platinum's, just costs more.
>


The reason double platinums are used on some engines is because the the
ignition system fires the spark with a negative voltage on half of the
cylinders and a positive voltage on the others. If you used single
platinum plugs, you'd have to get two kinds of plugs and install them
in the correct cylinders.

The double platinums cost a little more, but allow you to use the same
plug in all cylinders.

So you're right- the double platinums are not "better" and do cost
more, but just make the job simpler.
-Paul

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