Spark Plugs

[daniel]

Does it really matter what kind of plugs you get. I always get the cheap one but i want to do my jeep right and get some good one if there is a real dif in them other then the $$$$

[baldwinwb11]

It makes a huge difference, those fancy two, three, and four prong plugs that cost so much extra suck!!! I installed them on a previous jeep and felt the power go down not up. I would recommend standard plugs, tryed and true.

[wannabejeeper]

Yeah, what he said. I use Champion truck plugs. It's also what my techs recommend.

[SavageSun4x4]

1) Does it really matter what kind of plugs you get.

2) I always get the cheap one

3) but i want to do my jeep right and get some good one if there is a real dif in them other then the $$$$

1) Yes

2) Good does not come cheap and cheap does not come good

3) I am not sure of the best ones for the Jeep engine. I have been using the Bosh Platinums with 2 firing tips. I was told by Jeep engineers that they think those do make a difference.

The AC Igniters [which are not available for the Jeep the last time I checked] are some of the best plugs out there. They are good for about 1-2 hp per cylinder on many engines, don't ask me why. I have seen it with my own eyes on the dyno. Went with my buddy to do some dyno runs one weekend and they suggested the ACs. With no other changes we did 2 runs with and w/o the ACs and he picked up better than 1 hp per cyl:confused:

[Markos]

Champion Truck Plugs here also...

[AZLugz]

We ran Champion in the Race vehicles MANY times and they alway broke down, we ended up using Autolite and they were recomended by the Engine builder. $20K in a motor and it won't last 50 laps due to plugs is not good. Had a friend that ran a dragster and he found the same issue, more champions failed per run than the autolites. Of all the autolites we ran we only fried one set and it was a timing issue, just my .02.

[wannabejeeper]

We ran Champion in the Race vehicles MANY times and they alway broke down, we ended up using Autolite and they were recomended by the Engine builder. $20K in a motor and it won't last 50 laps due to plugs is not good. Had a friend that ran a dragster and he found the same issue, more champions failed per run than the autolites. Of all the autolites we ran we only fried one set and it was a timing issue, just my .02.

I think race engines are a little different. My buddies nitrous motor in his sand dragger burnt up every plug we threw at it until we put in NGK's.

[BRUZR]

I've always been a fan of NGKs, with it being a toss-up between them and Autolites. I read somewhere on this site (I think) WAY back that there were problems with one of the Bossch plug types having the ceramic at the contacts INSIDE the cylider breaking up and causing cylinder damage or something along those lines...


Anybody...Bueller???:confused:

[AZLugz]

Actually these are basically the same setup, just high tech, high dollar stuff, same pricipal as most gas engines. I use the autolites and have always had good luck.

[Griz]

I have a question about this subject, does the 4.0 L engine have aluminum heads?
I have heard/read that if you use the double/triple/quadruple(whatever) point plugs, that they extend into the combustion far enough that they will build up carbon and screw up a head when you remove them (or try to remove them).
Anyone know anything about this?

[AZG23]

I run the Champion truck plugs too....and NGK's in the wifes Xterra

[ThumpAZ]

I think race engines are a little different. My buddies nitrous motor in his sand dragger burnt up every plug we threw at it until we put in NGK's.

And that thing was down-freakin-right SCARY!!!
Tell Jimmy I said Hi, would ya.
Are you coming to the BBQ, or am I just never gonna get to see you west-siders ever again? Drag Jimmy and Steve and such out, mmmkay. Tell them that I wanna see them all again.

[ThumpAZ]

Plugs...
I was told by a craggy old Jeep mechanic a looooong time ago that the only plug to use in an AMC engine were Champion, truck plugs preferrably... and to NEVER use platinums in those engines. Now that the engine is a DC/Mercedes design, the NGKs would probably be the better choice.
Autolites are great for american engines and have a very good life in high-octane situations. But their life expectancy just isn't what I'd like to see in a normal engine. But they are GREAT at forgiving some timing/fueling issues.

No idea on the scoring the threads issue of which you speak, Griz. But I would be doubtful of it. Any plug (and many plugs) build up carbon deposits, but not normally to the point of protrusion past the electrode base, in a maintained and properly tuned engine. That would be enough to seriously foul the plug and you'd notice the lack of power and crappy idle way before the buildup got to the point of getting into the threads.

[Triple-XJ]

Champion truck plug :)

[TRLR8TDTJ]

x10 champion truck plug

[wannabejeeper]

And that thing was down-freakin-right SCARY!!!
Tell Jimmy I said Hi, would ya.
Are you coming to the BBQ, or am I just never gonna get to see you west-siders ever again? Drag Jimmy and Steve and such out, mmmkay. Tell them that I wanna see them all again.

You should see what we've done to it now!:D We fired up the BBC for the first time on Sat...:eek: ...that's all I have to say.

I'm going to try and make it.