On Sun, 12 Jun 2005 01:00:18 GMT, aarcuda69062
> wrote:

>In article >,
> RV > wrote:
>
>> On Fri, 10 Jun 2005 21:52:48 -0400, "RoB"
>> > wrote:
>>
>> >I am looking at replacing my spark plugs in a 3.8l GM engine (high mileage)
>> >and was looking at those NGK G-Power Plugs but a friend of mine says just
>> >put the cheapy AC Delco, because the platinum won't make any difference
>> >except possible quicker starts, but not worth the money... Is there any
>> >performance difference between copper plugs and platinum?
>> >Any suggestions would be appreciated..
>> >
>>
>> You either have a combustion chamber configuration or compression
>> ratio suitable for platinum plugs, or you don't.
>> If you dont then dont run plat plugs.
>> If the car manufactuers says run plat plugs, then you do have the CC
>> for it and should run them.
>
>Absolute rubbish. Neither compression ratio or combustion
>chamber design dictate whether platinum spark plugs should be
>used.
>Platinum plugs are strictly a maintenance sell.

So we can assume you are not a qualified motor mechanic

>
>> If you need to run plat plugs it is for longer life requirments of the
>> engine ignition maker, if you dont run them copper plugs will wear too
>> quickly sending the ignition out of normal KV working range.
>
>Actually, miss-firing occurs much before KV limits are reached,
>miss-fires being a big no-no as far as emissions are concerned.

So we can assume you are not a qualified motor mechanic

>
>> If you dont have the CC for plat plugs and run them, they will more
>> likely partially fail, possibly poor idle, unless, you are running a
>> higher compression ratio as in racing, then plat plugs are suitable,
>> if not desirable.
>
>Racing would be about the worst place to run a platinum spark
>plug.

So youre not a qualified motor mechanic and never raced anything but
your mouth.

>
>> So its CC config (valve postion) or CR fuel that determines if you use
>> plat plugs.
>
>Malarky.

So we can assume you are not a qualified motor mechanic

>
>> If you have the CC that is configured the clean the plug tips, then
>> use them., if you have heaps of CR then the heat will keep them clean
>> enough such as with racing.
>
>Double malarky.

So we can assume you are not a qualified motor mechanic

>
>> If you dont have the CR for them, or dont have the CC for them to keep
>> the plat plugs clean, they will most likely fouled or as we say for
>> plat plugs, contaminated.
>

Yes we motor mechanics like me who are qualified with 24 yrs working
experience in the trade.

>
>> If you have the CC config for plat plugs they are good to go at all
>> engine temps as in standard cars that use them, if you have big CR as
>> in racing, then you may need to use coppers to warm the engine, then
>> swap to plats, or you may have trouble starting and dirty a new set of
>> plats starting it.
>
>Who invents this crap?

Engineers.

>
>> Hope that helps.
>
>I don't think it did...

No surprise its no help to you.