From a technical stand point, Iridium and Platinum spark plugs will last longer and perform more consistently than a copper plug

In my experience, copper plugs work a little better with nitrous setups, but on a newer FI vehicle go for the platinums if not better. Unless someone shows you testing data, that is reliable, that copper performs in the 4.0 better than a platinum plug, then do it, otherwise disregard subjective opinions

 

Mine is running lots better since I put in the Champions. Of Course before its was running 3 different plug types between the 6 cylinders.

 

The proven/substantiated facts about iridium vs copper spark plugs are stated in the second paragraph of my original post on page 1. Again, those are facts, not opinions.

How can an engine possibly distinguish what kind of spark plug has been installed? It can't but it's a proven fact that platinum, and now iridium, will far out last a copper plug with regard to original gap retention. Given that the correct plug is installed, for whatever application, plug gap is the second most important factor. As a plug ages/wears, the gap gets wider making it harder to jump a spark and platinum/iridium plugs simply wear at a much slower rate than copper. That's a proven fact, not opinion.

 

All I know is my 4.0 wasn't to happy with platinum's. So I used the champions that are recommended by the Dealer and it runs great.

 

exactly

I have even switched my older carb'ed vehicles to platinum plugs, and I have noticed quite a bit less flooding and a little bit better driveability. But I dont want to get into opinions and subjectivity.

 

Anyone who passed grade 5 should know that copper is the softer and weaker metal. There for it will burn out faster. FACT. Now platinum from what I have sean dose not ground out well with a high nickel content block such as a diesel block, supper or turbo block, or I6. That's my opinion that if I had better resources I could prove. As for now just my opinion learned the hard way.

My choice is the e3 the uranium is hard and long lasting. And the diamond fire is a halo. Providing more service area as spark potential. I run them in both of my jeeps for a reason they are the cheepest bolt on performance upgrade on the market today! Throttle response is better then I imagined and far superior to any other plug. Power is a real seat of the pants difference. I have tryed all the rest and now run the best! If you haven't tryed them try them and they will speak for themselves

 

i have tried them. misfires like crazy and ended up detonating a plug. i will never run another gimmick plug again. ever hear of the placebo effect????

 

Nuclear spark plugs???

 

LOL wtf?

 

The e3 plugs look interesting. Their website has some good info... http://www.e3sparkplugs.com/

And this video is pretty informative I think..
http://www.e3sparkplugstv.com/featur...php?reset=true

Pretty cool that I know the student "Chris" in the video too (I graduated last year from MI Tech).

 

E3 plugs ran good for me for about a month. Then I started getting major misfires. I ended up pulling the plugs and they were starting to melt. There was what looked like weld berries on the plugs.

 

Plain ole Autolite 3924's FTW! And this is coming from a die-hard NGK guy...

 

I run copper champions now. Ill never change to anything else

 

I'm using NGK iridium on my '98 4.0L Jeep for similar reasons you've mentioned.

If there is a concrete technical reason to stick with the classic types of plugs I'm not aware, but I would be interested to hear.

Jeroen

 

That's the downside of having "sharp edges" for the spark to leave/go to. I like the concept, but it's not worth $6 a plug to me....I bought some of the Champions last night and I'm running much better now at idle. I didn't gap Champions that came out of the engine, but they were probably burned out to around 45 or 50 thousandths.