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Custom Dodge Ram Performance Mods - Engine - 5.7 HEMI V8 Discuss modifying your Dodge Ram with Performance Parts and Accessories!
Factory Spec: 5.7-liter HEMI® V8 engine - 390 horsepower, 407 lb-ft of torque.


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  #11  
Old 11-09-2012, 04:40 PM
TNC TNC is offline
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Originally Posted by RamTech View Post
Platinum plugs have never came in the Hemi.
So what's with the reference to platinum plugs in the link from the Ram site for the '12 Ram hemi that I posted here?
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  #12  
Old 11-09-2012, 10:18 PM
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snrusnak snrusnak is offline
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It says platinum tipped plugs. I'd assume this is a copper core plug with platinum tipped ground electrode.
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  #13  
Old 11-10-2012, 03:56 PM
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Quote:
Originally Posted by snrusnak View Post
It says platinum tipped plugs. I'd assume this is a copper core plug with platinum tipped ground electrode.
Sean, isn't that the case with most plugs that are referenced as platinum plugs or even iridium plugs? I think at least most all of them use a copper or similar core but the ground strap and electrode have a precious metal tip attached, welded, or whatever to achieve less wear during the combustion process. Some precious metal plugs use a conventional ground strap, some use a precious metal pad attached/welded on, and some use an insert in the ground strap made out of precious metals. All of them, however, who use the term platinum or iridium seem to have the entire electrode tip made out of the chosen precious metal, and it appears to be attached to a core of copper or similar conducting material, doesn't it? I don't think the entire core is made out of the precious metal. I think that means that "basically" most every precious metal plug is a "tipped" plug, if you get my meaning.

You know I've brought this up many times, and I'm honestly not trying to beat the proverbial dead horse. However, most everything I read about precious metal plugs references the issue that conductivity is not the issue or a problem with using precious metal plugs which if noticeably different might indeed affect an electronic ignition system. Everything I see on the issue is that the only difference with precious metal plugs is how the firing contact surfaces hold their edge much longer, don't corrode, and retain the proper gap for the same reason. I think the "conductivity" issue may not really be different or substantive...at least when either "conventional" or precious metal spark plugs are new. The real advantage of precious metal plugs is that they maintain a spark quality closer to the condition of the spark when the plug was new. And I see more info that qualifies copper as a better conductor than platinum overall, but a non-issue when we're just talking about the tip material versus the whole conducting portion of the spark plug core. There seems to be a myth or misunderstanding that precious metal plugs require less voltage to fire when it's probably just the issue that precious metal plugs don't require more voltage to provide quality spark as they age.

Yes, there's about as much controversy swirling around the use of precious metal plugs in the hemi than you can find in a "which oil brand" thread. I should still go out and pull a plug in my '12 Express just to confirm if it complies with the link I posted above from the Ram site that touts the issue that '12 Ram hemi's have platinum tipped plugs. But...I'm too lazy and just got through doing the struts, spark plugs, and other consumables at the near-100,000 mile mark in my wife's HHR. And yes, the OEM plugs I pulled out of her Ecotech engine were platinum, and some new NGK laser iridium plugs went back in.
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  #14  
Old 11-10-2012, 11:41 PM
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I pretty much agree with everything you said. Mainly, the benefit of various plugs is how long they will last, performing "like new". Copper center electrode plugs wear "fast" and performance steadily decreases over life. Plugs such as iridium center electrode plugs pretty much perform "like new" over say 100,000 miles(the metal doesn't wear near as fast as copper).

As far as the materials, yes some are "tipped", some are this, some are that....not really sure about the hemi plugs. I thought they were copper center electrode, all through out. I believe there are many variations(much of it marketing). I do know that the NGK iridium's I put in my buell have a full iridium center electrode. It is extremely small, or thin, compared to a copper plug. While there is not a huge performance increase, I believe there is a small performance increase with better spark(maybe negligible), and like you said mainly they perform like new longer.
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Old 11-12-2012, 03:31 PM
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I had great luck with NGK Iridium IX's in my 05 Hemi, checked them at 35,000 miles and gap was still the same as when I installed them, great plug that you don't have to change out every 30,000, more like 100,000+. We all know how much fun changing all 16 plugs is!!!LOL
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