I changed my spark plugs out the other day and when I examined the old ones, the center electrode was shaped like a cone. Anyone know why? is this normal?

 

perfectly normal thats how its supposed to look....

 

/thread

 

Are they Pt's?
If so, that's how they're supposed to look.


If they're coppers I'd be worried.

Pt's are denser, so they do not need as much mat'l to do the same job as something that's less dense.

Have you ever seen NGK Pts before? Apparently not.

 

oh are you serious? ok thanks then because when I was looking at a few websites that had different cases of worn out plugs and their center electrode was cylinder shaped and mine werent so I was just wondering why.

 

Ever wonder why? ... take a look at an NGK Cu ... ... Looks much different than that ...

 

NGK CU:


NGK Pt:

 

Yes they are platinums and I wasnt aware that they take this action.

 

Yup their fine. Thats how platinums look although I hope you replaced them with more platinums as you might notice a difference in performance as maximas were designed with platinum use in mind.

 

Actually the coppers have been proven to work just fine. Platinums = longevity. Not performance

 

No WAY ! since when... damn - I don't post for a few hours and everything changes around here.

 

coppers are by far better. only reason nissan used plats was the maintenance schedule. longer life, means the less people have to think. until they find out the price.

 

that explains it....
I got confused because I put copper ones in and I thought the platinums center looked the same as the coppers center, apparently not thanks for clearing that up to me

 

I think better this before it snowballs....Domino effect ....