HEy guys I need your opinion on this which are better spark plugs for the STR Champion Iridium or NGK Iridium? The champions have a gap of .050 and the NGK's have gap of .040. What is the OEM spark plug gap for the STR Jag? On http://sparkplugs.com/results_app.asp?aaia=1410635 it says that the Champions are of OE for the STR, but I'm still deciding which one to choose, any help

Thanks

 

Denso iridium.

 

A spark plug is a spark plug. Don't sweat the small stuff.

 

Absolutely agree, A plug is a plug, and a spark is a spark.

 

LOlz....yeah but there is a difference btw Iridium and Platnum head plugs. So all I wanted to know is which is better suited for the STR's, Champions or NGK, Denso is good too, but for the price of Denso I might as well get the OEMs.

 

In price and durability, maybe. Performance, nope.

 

Not true for modern engines.

 

Proof please, and not marketing cr*p. Thanks.

 

The original plugs in my XK8 were NGK iridium, so I replaced with similar. I know, not an s-type or an 'R', but still.

 

Read automotive research journals. Consider them marketing if you wish. Your car: you fit what you like.

The idea that a spark is a spark is .... somewhat behind the technological reality.

 

I have, lots of them. There is no mention of 'improved performance'.

Link please.

 

taken from a simple google search:



Kenny Duttweiler of Duttweiler Performance in Saticoy, California is no stranger to making horsepower, especially with turbochargers. After years of building little turbocharged V-6 Buicks that produce in excess of 1,500-hp, he found a lucrative market in NMCA's "World Fastest Street Car" classes building 1,700-hp small-block Chevy V-8s for winning racers such as Bob Rieger and Rod Saboury.



Kenny had no idea that the solution to this perplexing problem would be a new iridium spark plug technology from Denso. In Denso's research for an OEM spark plug that would provide 200,000 miles of service life and lower vehicle emissions, Denso developed a new iridium alloy electrode spark plug. The progression from nickel alloy plugs to platinum plugs in 1982 was a giant leap forward in technology. Denso's introduction of the iridium alloy spark plug will prove to be even more significant, especially for high-performance and race engines. The major difference in the Denso Iridium Power spark plug and conventional platinum plugs, besides the alloy, is the size of the center electrode. A typical platinum plug has a 1.1mm diameter center electrode. The Denso Iridium Power OEM plugs have a .7mm diameter center electrode and the Denso high-performance plugs have a .4mm center electrode.

 

Yes, I've seen that one and almost lost my coffee on the screen when I first read it.

http://corp.advanceautoparts.com/eng...20010101ds.asp

"When the word gets out about the new Denso Iridium Power spark plugs that added 750-hp to Kenny Duttweiler's 450-cid twin-turbocharged Ford, engine builders and tuners will gain more respect for the lowly spark plug."


This infers that the previous plug was unable to 'light the fire' causing a performance LOSS. If a given plug reliably fires the combustion chamber charge, there is nothing more to be gained by zoomy-swish expenseomatic plugs. The stock plugs do an excellent job of performing that function.

Here's another quote from the article:

"In Denso's research for an OEM spark plug that would provide 200,000 miles of service life and lower vehicle emissions, Denso developed a new iridium alloy electrode spark plug."

There's the durability I mentioned. Lower emissions? How? It must presume that the previous plug has failed and that the iridium plug keeps on trucking.

BTW- my professional background is 31 years in the engine development, manufacturing, field support and safety/reliability tracking business. I had years of direct OEM experience with better, faster, stonger plugs being peddled by the manufacturers. No difference in performance from best to worse, but a measurable difference in durability and reliability.

 

Great. Where did I talk about "improved performance"? Oh yeah, I didn't. Don't accuse me of stuff I didn't do, please.

 

So we agree then. Great!

 

It doesn't look like you agree with me.

 

Sooo denso Spark plugs it is for my 03' STR!

 

What specifically do we NOT agree on?

Durability- better

Price- higher

Performance- same

 

You keep putting words in my mouth. We will never agree as long as you do that.

 

Each one has their opinion ,I think this thread will be look like "WHAT'S THE BEST OIL FOR S TYPE" .
You may agree or disagree that doesn't matter that much but what matters is keep your temper and good manner