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  #11  
Old 12-18-2012, 12:46 PM
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does the 4.7's have a dual plug setup like the 5.7's...whenever i swap in new plugs I pretty much only change the primaries (not exhaust)..
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  #12  
Old 12-18-2012, 01:24 PM
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Yes we have an exhaust and intake plug. 16 total. & Thats what i was thinking fred just changing primaries. What do you think Sean?
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  #13  
Old 12-18-2012, 08:53 PM
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The 2008+ 4.7L uses a copper/yttrium plug on the intake side and an iridium/yttrium plug on the exhaust side. From the research I've done, the only purpose of the yttrium is for longevity, and has nothing to do with performance. Both of these plugs(bosch) are "specialty" and pretty much specifically designed for this engine. This means that you can't simply pick the same plug but one heat range colder(since they only make these specific plugs in one heat range).

So what I would do is choose a regular copper plug(for the intake side) that is one heat range colder, and it should perform fine, just won't last as long. If you do this, I'd change them every 30k miles(maybe more with nitrous).

As far as only changing the intake plug, I have no idea how it would be effected with only doing that. Since the exhaust side plug is iridium, it has a significantly finer center electrode tip which might be prone to being a hot spot(leading to detonation) with the nitrous. I'm certainly no expert but just trying to think this through... Maybe also change the exhaust plug to a colder heat range, or maybe change it to a copper plug. I'm not really sure how this would all effect the performance or the tendency to detonate. Or, maybe just try changing the intake plug only...

I'm trying to help as best I can lol, but I'm no expert with nitrous. I'd say if someone can confirm the finer center electrode won't be an issue(I assume the nitrous raises combustion chamber temps significantly) then go ahead and leave it.

So, Fred, you leave the stock plugs(stock heat range, too) in the exhaust side?
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  #14  
Old 12-18-2012, 11:48 PM
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I actually use the colder plug for exhaust side too..I just don't change them as much...I tend to change my primary plugs before each time I go to track... and depending on condition of the ones I pull out, I'll use them for the exhaust side..that way I only buy 8 at a time...
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  #15  
Old 12-19-2012, 07:22 AM
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Gotcha.

Luis, I would change both plugs to a colder heat range.

After looking some more, I'm not even sure if the intake plug is actually copper, it might be platinum or nickel mixed with the yttrium. It's so hard to find correct info on these plugs.

The material doesn't really matter, there isn't really a performance benefit. The material differences are mainly only for longevity. So you may just want to go with a copper plug in both holes. You've gotta start somewhere, might as well start cheap lol. I'd get two copper plugs(make sure the threads and reach are correct), and make sure they are a heat range colder, then throw them in there and see how it runs. Maybe do a comparison for 60ft, 0-60, 1/4 mile, etc to see if it performs as good/worse. Then go on to the nitrous setup. You may need mess with the gaps as well.
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  #16  
Old 12-19-2012, 11:10 AM
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Fred what plugs did you use? I will probably use your technique when it comes to swapping my intake plugs and putting them on exhaust as they age.

Yea Sean I agree the material is just for longitivity. I remember first going over this a while back, we concluded that. I had found some plugs that we said would work, I had them book marked on my computer here at work but since I left they changed out my computer when I got back:/ so they are lost. But heat ranges differ by manufacture.
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  #17  
Old 12-19-2012, 12:46 PM
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Try out the coppers and see how it runs. You will have to contact Bosch with the part numbers of the stock plugs to get the heat range, then look up one of those cross reference tables for different manufacturers when you choose your new plug. I might have that saved on my laptop I'll look this weekend. When you contact bosch, ask for ALL the info they have, since none of it is posted online.
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  #18  
Old 12-19-2012, 05:59 PM
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OEM plug
http://www.summitracing.com/parts/bch-fr8te2

possible options.
http://www.summitracing.com/parts/ngk-5266/overview/
http://www.summitracing.com/parts/ngk-2460/overview/
http://www.summitracing.com/parts/ngk-6745/overview/

Heres the page of spark plugs.
http://www.summitracing.com/search/d...lug-reach/19mm
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  #19  
Old 12-19-2012, 05:59 PM
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also read that Iridium is not good for nitrous. any answers to that?
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  #20  
Old 12-26-2012, 09:17 PM
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I would guess that iridium is not good for nitrous. I would think nitrous leads to increased combustion chamber temps, and the iridium plugs have extremely fine center electrode tips, which would probably be prone to being a hot spot and cause detonation. Also, you want to change/check your plugs often with nitrous, so no benefit of a 100k mile plug(iridium).

I don't think I'd go with any of those plugs you listed.

Well, I think the best conclusion I can come up with is to start out with a plug like the NGK ZFR6E-11. I found this on a charger forum, can't find it anywhere else though. But I THINK it has the same threads, and reach as the oem plug, and is one heat range colder, and copper center electrode. After looking in to it more, I wouldn't use the same plugs the hemi guys use, only because they reach out further. They'd most likely be ok, but without verifying it, I'd fear they'd interfere with the valves.

The stock 4.7L intake side plug(FR8TE2) heat range is a Bosch 8, which equals a NGK 5. If you want one range colder that would be a NGK 6.
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