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Old November 18th 06, 04:36 PM posted to rec.autos.makers.ford.explorer
oklaman
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Posts: 29
Default '98 Explorer V8 Spark Plug Replacement?

thanks Paul. A very good answer.
> wrote in message
ups.com...

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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