Superseded Part # for HEMI Spark Plugs - Jeep Commander Forums: Jeep Commander Forum
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post #1 of 6 (permalink) Old 10-20-2011, 06:43 PM Thread Starter
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Superseded Part # for HEMI Spark Plugs

Went to the dealership to pick up some spark plugs for the HEMI and was confused with the part number. Gave the parts clerk my VIN and told em to double check that they have the right part number. Was told the spark plugs have a new part number that superseded the old ones.

Looks like NGK now makes the OEM spark plugs for the 2009 HEMI.

Mopar part # SPLZFR5C11

The box also says Nickel spark plug on it.





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post #2 of 6 (permalink) Old 10-20-2011, 07:16 PM
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Interesting.

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post #3 of 6 (permalink) Old 10-21-2011, 06:51 AM
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Chrysler may have just switched suppliers because of economic reasons, OR, maybe there was some sort of problem and they found these NGK worked better. Sadly, they won't tell you, they'll just issue a new part number.

The center electrode is the critical part of the spark plug, usually when they add a metal name to the plug, its to describe what makes the spark plug different then the others and it's usually indicates something about the center electrode.

Nickel can be alloyed with steel to make stainless steel or a harder, more corrosion resistant steel. Or you can coat steel with Nickel. Thats my guess, just like some plugs have platinum wire, nickel plugs have a nickel alloy center electrode that last longer and performs better then a plain steel center electrode.

Copper plugs, actually have a copper electrode right up to where it extends into the combustions chamber, I guess, the copper would erode away to fast, and the advantage is the lower resistance the copper offers for the 85% of the path through the spark plugs before it gets to the hardened steel tip in the combustion chamber.


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post #4 of 6 (permalink) Old 10-21-2011, 07:00 AM
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Hasn't the price of copper skyrocketed in the past 2-3 years... makes you wonder...

-Matt
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post #5 of 6 (permalink) Old 10-21-2011, 12:34 PM
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Originally Posted by Matt_ View Post
Hasn't the price of copper skyrocketed in the past 2-3 years... makes you wonder...
Good point. That could be the reason. Although it has always been said that the HEMI runs best on the OEM Champion copper plugs.

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post #6 of 6 (permalink) Old 10-26-2011, 02:19 PM Thread Starter
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According to wkjeeps.com the 2005-08 HEMI's have Champion plugs and the 2009-10's have the NGK's.

http://www.wkjeeps.com/wk_sparkplugs.htm

Also, all plugs have copper cores and are covered in another material. A pure copper plug will last only a few hours.
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