In article >,
RV > wrote:

> >Sure. GM wanted a 100K mile "tune up". A standard plug should work
> >fine but won't last as long. I hate the term "copper plug" since
> >copper cores are the same in standard, platinum, or iridium plugs.
> >The electrodes are some sort of nickel alloy.
>
> Copper plugs isnt used as an explicit term, more slang for standard
> plugs.

Okay, why don't you explain for us the reason that copper is used
in a spark plug?

> Names used generally refer to the plating not the core.

Do you seriously believe that "copper spark plugs" actually have
a copper plating somewhere, and for gods sake, don't tell us it's
on one of the electrodes.

> So long as you know what is refered to is all that matters to the
> topic..

You're side stepping.

> If you go to the parts store and ask for plat plugs or copper plugs
> they wont ask you what core you want and will know what you are
> refering to.

Hardly germane to the technical claims that you've made.

>
> >
> >There are some applications where a platinum or iridium plug is
> >absolutely necessary. My 1995 Acura Integra spec'ed a 1.3 mm gap
> >and my guess is that a standard plug wouldn't last the 30K miles
> >that they normal give for regular plugs. The platinum plug was
> >spec'ed for 60K miles.
>
> Longer life is the upside, but the downside is easier to contaminate
> long before they are "worn"

What happened to compression ratio, combustion chamber design and
valve placement?

> The GM and the Honda obviously both keep them clean enough to last the
> longer period, not all engines will.

Oh, do tell, how do GMs and Hondas magically keep spark plugs
"clean enough?"