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Unread 04-14-2010, 08:49 AM   #11
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Quote:
Originally Posted by wierdo124 View Post
Also, Testecull, every spark plug i've bought in the past five years has said specifically, DO NOT GAP
wat

If they're a standard, single electrode model that's been in use for 90+ years, they must be gapped or you won't have an engine that runs right. If you mean plugs like in Cluff's picture then no, they don't get gapped.

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my Iridiums are no gap for one reason

lol those don't get gapped, but I'm not referring to funky ends like that. I'm referring to the same single-electrode plug that's been in use for damn near a century.
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Unread 04-14-2010, 10:24 AM   #12
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NEVER try to gap iridium plugs. You will break them in the process
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Unread 04-14-2010, 04:50 PM   #13
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Any ACDelco or some NGKs will say specifically on the box, PREGAPPED TO .060, DO NOT RE-GAP!!

My local napa told me to not do it either, evidently on ACDelcos at least it voids any plug warranty.
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Unread 04-14-2010, 08:31 PM   #14
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I got Bosch iridium, because NGK doesn't make them for me.
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Unread 04-14-2010, 11:55 PM   #15
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The best and most effiecient plug for that jeep is a Champion Copper resistor they will make more power but need replacing every 30K. NEVER gap a p[latnim or iridium it strips the coating and defeats the purpose.
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Unread 04-15-2010, 01:44 AM   #16
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The Iridiums work better than copper, man
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Unread 04-15-2010, 02:57 AM   #17
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Actually silver plugs are the best, but copper creates a larger spark(conducts electricity better) then iridiuum. The iridium plugs last longer do to the harder metal and less spark creating less stress on the plug. Most manufactures use them because it lowers the cost of ownership. Yes you will get more miles from the iridium but it's at the sacrifice of performance. Dodge motors are specificly designed for champion plugs. Another little known fact of Dodge vehicle's is the CPU isn't as well shielded as most manufacturers (excluding 4.7L V8 and newer model Dodge engines using there new OBD II system) Champions are the only spark plug on the market that is shielded to restrict EMF when fired. When other brand plugs are used the EMF field generated slowly deteriates the circuitry in the CPU causing failure over long periods of time and Radio interferance (ever wonder why that local channel that usually comes in so clear has static sometimes?). This is a great article I read when research plugs for my Liberty I suggest everyone reads it. It was put out by Dodge enthusiast.http://dodgeram.info/Engine-Gas/SparkPlugs/spkplghnbook.html#Today's

Plus what's the real savings a Iridium cost what 6.99 a champion resistor cost 1.49. Tune up on a iridium is 100K with good motor for 6.00 worth of resistors you can get 120K. Also the RC12LYC Champion Resistor is the Original Equipment Manufacturer part just like it came from Jeep.

Keep in mind im not a Champion fan boy I actually prefer NGK, AcDelco, and Pulsar. When I need a cheap plug it's usually a Autolite or NGK. Except in Older Dodge motors I only use Champion. In newer dodge motors I use NGK because most are from Mitsubishi Motors.
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Unread 04-15-2010, 07:05 AM   #18
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Heh, never heard that. I've heard Champions are good in Dodges, but nothing else.
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Unread 04-15-2010, 10:43 AM   #19
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Quote:
Originally Posted by lautinjr View Post
Actually silver plugs are the best, but copper creates a larger spark(conducts electricity better) then iridiuum. The iridium plugs last longer do to the harder metal and less spark creating less stress on the plug. Most manufactures use them because it lowers the cost of ownership. Yes you will get more miles from the iridium but it's at the sacrifice of performance. Dodge motors are specificly designed for champion plugs. Another little known fact of Dodge vehicle's is the CPU isn't as well shielded as most manufacturers (excluding 4.7L V8 and newer model Dodge engines using there new OBD II system) Champions are the only spark plug on the market that is shielded to restrict EMF when fired. When other brand plugs are used the EMF field generated slowly deteriates the circuitry in the CPU causing failure over long periods of time and Radio interferance (ever wonder why that local channel that usually comes in so clear has static sometimes?). This is a great article I read when research plugs for my Liberty I suggest everyone reads it. It was put out by Dodge enthusiast.http://dodgeram.info/Engine-Gas/SparkPlugs/spkplghnbook.html#Today's

Plus what's the real savings a Iridium cost what 6.99 a champion resistor cost 1.49. Tune up on a iridium is 100K with good motor for 6.00 worth of resistors you can get 120K. Also the RC12LYC Champion Resistor is the Original Equipment Manufacturer part just like it came from Jeep.

Keep in mind im not a Champion fan boy I actually prefer NGK, AcDelco, and Pulsar. When I need a cheap plug it's usually a Autolite or NGK. Except in Older Dodge motors I only use Champion. In newer dodge motors I use NGK because most are from Mitsubishi Motors.
Well... Every car I've owned so far has come with non-iridium plugs. And everyone here I've talked to has told me they are performance plugs. Copper is the budget plug. It just doesn't make sense.
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Unread 04-15-2010, 01:52 PM   #20
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I have heard around on jeepforum that using platinum plugs on a 4.0 can cause erratic idle, hesitation issues, and odd operation in general.

I have my jeep lightly modded (need.... more.... power), and if I could gain power or economy by switching from my factory RC12YC plugs then I would have long ago. With just a few mods you can have 200hp and 280 lb/ft of tq (at the crank), and have a very reliable old engine. Intake, exhaust, and fuel are areas that could see gains from mods.

Take a look at my sig to see what I've done to my jeep so far.
If you're ever thinking of needing more power than basic bolt ons can provide, just pm me.
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