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  #13  
Old 02-28-2012, 12:41 PM
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Re: V8 Spark Plug Maintenance Interval

The HEMI is installed in RAM trucks as well as other vehicles. Apparently the installation of 16 copper plugs saves the Chrysler/Fiat on the assembly line. But it's a great reason to bring the vehicle in at 36,000 so they can check out the vehicle for other services. The E3 plug is all hype. Ask them to show the dyno testing. The massive ground electrode glows in the heat unlike the the copper cored ground electrode on the Champion 9055. I'd want the hottest part of the spark plug to run as cool as possible for better performance and longer life.
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  #14  
Old 02-28-2012, 01:20 PM
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Re: V8 Spark Plug Maintenance Interval

Chrysler runs extensive durability tests on their engines. They will recommend maintenance intervals based on their testing.

Chrysler makes no extra money when spark plugs are changed out, so I doubt there is any conspiracy going on here.

The maintanance costs were one of the reasons that when I traded in my Hemi, I chose to replace it with the much improved V-6. Even the oil changes are less demanding, and the filter, mounted high up on the front of the engine, makes do it yourself changes a snap.
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Old 02-28-2012, 04:31 PM
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Re: V8 Spark Plug Maintenance Interval

IIRC - the SRT version of the HEMI uses the big ticket (platinum/whatever) plugs and has maintenance intervals similar to that of the Pentastar
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Old 02-28-2012, 05:26 PM
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Re: V8 Spark Plug Maintenance Interval

The copper plugs are not only the cheapest, but have the best spark = better performance. I'm o.k. with changing them out every 30K, for those who have changed them out for longer life plugs have noticed a dip in performance and sometimes a rough idle. This is a case where the stock units work the best...
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Old 02-28-2012, 05:49 PM
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Re: V8 Spark Plug Maintenance Interval

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Originally Posted by nek121328 View Post
The E3 plug is all hype...
Another gimmick plug that should be AVOIDED. NO PLUG will get you increased power or mileage over new stock plugs. Period.
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Old 02-28-2012, 06:37 PM
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Re: V8 Spark Plug Maintenance Interval

Beg to disagree, but copper cored plugs don't fire better. The spark is erratic firing all around the square ground wire. The Champion Iridiums along with Double Platinums have Trapezoidal ground wires along with the finer wire center electrode. That focuses the spark to one point on the ground electrode for better performance and idle stability. You should see the smoother firing pattern on an a oscilloscope and results on the dyno.
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Old 02-28-2012, 07:40 PM
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Re: V8 Spark Plug Maintenance Interval

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Originally Posted by swampass2 View Post
Just read this post yesterday about gear lube. The PDF in the first post is interesting stuff, and if you trust it you don't even want to pay $4/quart for the Mopar fluid...

Interesting test on Gear Lube for Diffs

Thanks. A good read.
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