Spark Plug Question

[Scottwax]

Like he said dont waste your money on the hype a plug isnt going to make you faster. I run cheap NGK`s in my sprayed mustang.

Unfortunately, my intake manifold has to come off to remove the rear three plugs (Maxima with a VQ35) so Iridium it is when I have to change them.

[KnuckleBuckett]

How long ago was this? I find the chain-store Bosch to be junk (although I haven`t used them in a long time because of a bad experience). Sometimes you get what you pay for...when Bosch first came out with "platinum" plugs they were selling them at pretty much the same price as a junk plug ($1 ea.)...but I said to myself "they can`t be junk; they`re platinum"...I was wrong...they were junk.

Been a while. So, taking your experience into advisement, I called a buddy that remained at those labs.



According to what he said, price and value have little correlation. He asked that I not provide specific results online due to confidentiality. Specifically negative feedback from their testing.







However I can say that my earlier advice is still relevant and that Autolite is looking good these days. (that much has changed)



I can also say I personally use NGK whenever possible.

[Setec Astronomy]

Been a while. So, taking your experience into advisement, I called a buddy that remained at those labs. According to what he said, price and value have little correlation.

All I know is...sometime in the `90`s, I got the original consumer Bosch Platinum plug for my GM car. I knew that GM was putting platinum plugs into new cars and saying you didn`t need to change them for 100,000 miles, so I figured I could go a bit longer than the 30,000 mile interval for my car. After about 45,000 miles, the car wasn`t running so good, and I started thinking about how these plugs didn`t cost any more than a regular plug, so I pulled them. Besides all of them having a deep crater worn in the side electrode, several of them were missing parts of the center electrode...which I can only presume went out the exhaust (hopefully not with the valve closing on them).



I learned two things from that experience: what a "double platinum" plug is, and never to use a Bosch plug again.



PS I did an internet search at the time and found a picture of the same plug that came out of a BMW bike IIRC, with about a 1/4" long piece of the center electrode hanging on the plug, waiting to fall off and trash the cylinder.



EDIT: I think this was it: Bosch Platinum Plug Failure I guess it wasn`t 1/4`` long...I just know several of mine didn`t have any center electrode at the end of the insulator, they had broken off at various depths inside the insulator.

[wytstang]

This is old but Heathenbrewing hit the nail on the head my mustang will only get copper.