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Unread 08-12-2013, 10:48 AM   #16
RockyClymer
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I replaced my Champions with NGK Iridium plugs at the suggestion of RIPP to work with their SC - seem to work fine so far. I did notice they are a cooler plug and gapped different than stock.

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Unread 08-12-2013, 06:55 PM   #17
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The NGKs are probably iridium, which doesn't last as long as platinum, which doesn't last as long as copper.

Edit: Ok so it looks like copper and iridium plugs have similar life expectencies.
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Unread 08-13-2013, 01:20 PM   #18
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GH. Can you give us a source of supporting data? News to some of us.
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Unread 08-13-2013, 01:44 PM   #19
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Part of it looks like a combination of me having good luck with copper plugs back in the day (I never replaced a set with less than 30k) combined with a set of crappy platinums that lasted about the same.

But Denso recommends 30k miles for Iridium and 60k for platinum.
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Unread 08-13-2013, 09:15 PM   #20
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Quote:
Originally Posted by Godholio View Post
The NGKs are probably iridium, which doesn't last as long as platinum, which doesn't last as long as copper.

Edit: Ok so it looks like copper and iridium plugs have similar life expectencies.
Iridium plugs have a 100k change interval,platinums are generally 60k,and copper plugs are 30k.

Copper plugs give the best spark just wear faster but are 2-10 times cheaper per plug then the others.
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Unread 08-14-2013, 05:37 PM   #21
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Almost due for some on my JK, 86k on the factory plugs. My TJ I checked and instead of the factory .035 they were worn (proper term?) to .075... Ran so much better when I gave the 2.5L turd some new ones.
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Unread 08-16-2013, 09:47 PM   #22
sgtmajor138
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So what is the recommended replacement plug? I have 98k on my '09. I have not had it but a few months, but I was planning on replacing them soon anyway.
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Unread 08-18-2013, 08:05 AM   #23
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Quote:
Originally Posted by CombatDiver View Post
I checked the plugs on my 2009 Sahara at 46,000 and they were already so far gone I couldn't imagine it was operating on all six cylinders. The original owner never took it offroad, she was a mall warrior so I know it's not the result of crawling. I installed the best plugs I could find and the fuel economy immediately jumped (which tells me the spark plugs were in fact causing trouble). It went from 16- to 20+. I expect to continue to upgrade things but was surprised to find modern spark plugs going out so quickly.
What does going off road have anything to do with premature spark plug wear?
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Unread 08-18-2013, 08:42 AM   #24
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Lower mileage for the same amount of wear, I think is what he meant.
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Unread 08-18-2013, 11:10 AM   #25
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Quote:
Originally Posted by Godholio View Post
Lower mileage for the same amount of wear, I think is what he meant.
How do you wear your plugs out faster while doing low rpm offroad driving.
I'm just not getting it. Tires, shocks, body parts, get abused but how do spark plugs?
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Unread 08-18-2013, 12:24 PM   #26
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Think of it this way for sake of discussion. Let's say a plug is good for "x" number of sparks. It may be possible that the number of sparks, (sparks per mile?) is greater when offroading in high range than when driving at 70 mph down the freeway. If so, then the total number of sparks (x) is reached with less miles driven...seems like you would have to do an awful lot of low speed/high rpm off road work to really make a difference though...and, a plug does not fail after exactly "x" number of sparks.
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Unread 08-18-2013, 03:17 PM   #27
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Offroading results in longer hours running versus miles. That was what I was referring to.
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Unread 08-19-2013, 08:11 AM   #28
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Quote:
Originally Posted by sgtmajor138 View Post
So what is the recommended replacement plug? I have 98k on my '09. I have not had it but a few months, but I was planning on replacing them soon anyway.
The recommended plug is the factory plug. Others have tried other plugs with varying results but I can't see how it would make much if any difference in performance. Chryslers vehicles have always seemed to be finicky with plugs. Not all plug manufacturers heat ranges are the same, so a 14 champion may not be the same heat range as a bosch 14. As long as the heat ranges are the same you should be okay with other plugs.

My friend just replaced his with some NGK's and it is working great so their heat range must be close to the same. I have always liked the NGK's in my motorcycles and atvs. I haven't had any issues with the stock plugs, I just know that they need to be replaced at 50-60k. My hemi in my other jeep wants plugs every 40k and there are 16 of them.
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Unread 08-19-2013, 09:41 AM   #29
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I replaced the plugs in my 2009 with 42k miles last week. With it using a quart of oil every 4K miles I was more curious how the plugs looked. I was surprised to find they looked like they should. The gap was at .065, but who knows if they were gapped at exactly .050 from the factory. The Champions I purchased at Vato Zone were damaged (2 were used) so I had to go with a set of Bosch plugs. It's running great.
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Unread 08-19-2013, 03:00 PM   #30
dukeboy_318
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Anyone tried the E3 plugs in a JK? do they work?
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