Function of spark plug

What is a good spark plug? In terms of performance.

Function of spark plug is to give a spark to air+fuel mixture. If a
$.99 spark plug is doing its job, giving a spark, then why use an
expensive one?

As far as platinum spark plugs are concerned, they are only for the
longer life of plugs. Nothing more fancy about them. Am I correct?

Thanks

Abbas

Well sometimes when you put in a junk plug the engine will start to
miss right away or only last a few weeks or months before engine
doesn't fire on all cylinders. I've seen many cars that didn't run
because of cheap plugs. I seem to see alot of Bosch or Champion plugs
that cause problems. At the shop where we work we recommend NGK for
Japanese cars, with Nippon Denso coming in second. For GM we usually
use AC Delco, and for german we use bosch. And sometimes we use
champion for chrysler, and Motorcraft or autolite for Ford. Sometimes
I see problems with Bosch in a Japanese car or champion in a Japanese
or German car.

You are pretty much correct... the more expensive plugs seem to harp on
the point that they last longer.

Professor
www.telstar-electronics.com

Plug life. Plugs that are too hot burn- Plugs that are too cold foul
up. Running hotter plugs prevents fouling, but used to result in
shorter plug life. Plug mfgs have made great strides in developing
plugs that run hotter, but last longer.

Abbas wrote:
> What is a good spark plug? In terms of performance.
>
> Function of spark plug is to give a spark to air+fuel mixture. If a
> $.99 spark plug is doing its job, giving a spark, then why use an
> expensive one?
>
> As far as platinum spark plugs are concerned, they are only for the
> longer life of plugs. Nothing more fancy about them. Am I correct?
>
> Thanks
>
> Abbas
>

Thank you all :-)

Abbas