RE>Platinum Plugs

[ARTHUR OKUN]

You wrote: 
>
>
>-Arthur Okin ? writes:
>-THE ONLY ONES THAT SEEM KIND OF INTERESTING ARE THE NEW BOSCH 
PLATINUM
>-FINE WIRE TYPE BUT I KNOW SOMEONE WHO USED A SET BUT HAD CARBON
>-FOWLING PROBLEMS ON AN OVERLY RICH ENGINE  ALSO A ENGINEER FRIEND
>-OF MINE SUGGESTS REPLACING INSTED OF CLEANING BECAUSE OF THE 
>-POSSIBILITY OF INSULATOR CRACKING
>
>>Jens writes:
>>There was no difference between the new and the old plugs. 
>>This was exactly what the Bosch guy who sold me the spark plugs had
>>told me (I did not believe it). From what he said, the Platinums last
>>VERY long, esp. those zero-types with the special electrodes. He said
>>the plugs are mostly used in racing engines and was surprised to find 

>>them in a samll, very common car.
>
>I have not had a dirt bike in about 8 years. But at that time the 
motocross
>bikes came with platinum plugs. These had the very thin electode that 
has
>been discussed. I was suprised to hear someone say that they had bad 
luck
>with them fouling more than standard plugs. As I understand it, they 
were
>used in dirt bikes because they resist oil and carbon fouling (two 
stroke).
>One of the reasons for this is supposed to be that there is less 
parallel
>surface between electrodes for deposits to accumulate or get lodged 
in. A
>second reason may also be that the harder electrode tends to resist 
wear
>keep a sharp edge for the spark to jump from. This may be more evident 
in 
>a comparison on aging plugs.
>
>Jim Cook
>
the no cleaning goes for all types of automotive plugs
ithink  what happened was that the insulator was fouled with carbon.
i bet those bosch plug will go 100000 miles 
in a properly operating engine running on unleaded fuel
propane or nat gas even longer