Originally Posted by snrusnak
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.