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Old 07-05-2018, 01:03 PM
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New spark plugs

Have ran the YJ for a few days with the new Champion spark plugs and can tell a bit of difference from the old Bosch plugs. Cold start and idle seems more even and consistent, but motor doesn't feel like it revs up as fast with the foot feed acceleration, maybe just the way I feel after driving.
Jeep drives fine, but can there but that much difference between the Bosch Platinum and Champion Copper RC12LYC?

This pic is of the old spark plugs


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Old 07-05-2018, 10:40 PM   #2
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I only run NGK's in my 4.0 so i dont know. But i have heard 2 prong Bosch Platinum plugs are bad in older 4.0's the ignition system cant run them as effectively as the newer OPDA coil pack 4.0's can and you should stay with a single electrode plug. I dont like Champion plugs but i think the 4.0 would run better with them in comparison to the Bosch.

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Old 07-12-2018, 12:22 PM   #3
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I too use NGK plugs on ALL of my vehicles and dirtbikes. I've never been a really big fan of Bosch but people swear by them. I agree with agalloch, you're driving an older vehicle and should stick with the type of plugs they were designed to use.

If I were you I'd just get the NGK's and do the spark plug wires, cap and rotor while you're there.
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Old 07-13-2018, 05:24 AM   #4
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Another vote for NGK.
they've never failed me- even in 2 strokes.
Bosch on the other hand, I've had numerous issues with in multiple vehicles.
That said,
While champions have been hit-or-miss for me, there are several applications that they seem ideal for.
Many here swear by them for heeps.
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Old 07-13-2018, 12:01 PM   #5
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I don't know how the average person might go about measuring the performance differences between spark plugs other than the "seat of the pants" dyno.

If a scholar technician has access to a rear wheel dyno he might be able to determine some performance differences. I expect those differences would be slight, even on a low mileage motor.

I use the recommended Champion plugs and haven't had any issues. My motor has almost 200K miles and suffers from the wear that one would associate with that kind of miles. I doubt that anything other than a new motor would improve my vehicles performance.

If I did a coil on plug modern fuel injection system I might benefit from something other than the recommended plugs on a new motor, but without access to an actual dynamometer, I'll keep using the recommended plugs, even with a new motor.

If it ain't broke, why fix it?

Good Luck, L.M.
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Old 07-13-2018, 02:02 PM   #6
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In earlier years I would run my Triumph (MC) at Orange Co Int Raceway. Had a rep from Champion hand me a set of plugs, then told me to only use them to warm the bike up, not during a race. Haven't used Champion since, except maybe in a chainsaw.
Yeah, they can make a difference, but likely not one you'd feel until they failed.
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Old 07-13-2018, 02:32 PM   #7
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I have had champions fail a lot in atv's dirt bikes and lawn mowers. Then i switched to NGK and i have never had one go bad thats why i use them in my jeep and other cars. It's not a power increase thing they just seem to go forever and i like reliability so i quit using Champion. I am a fan of Japanese made stuff it's quality and it lasts.
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Old 07-13-2018, 09:28 PM   #8
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Quote:
Originally Posted by agalloch07 View Post
I have had champions fail a lot in atv's dirt bikes and lawn mowers. Then i switched to NGK and i have never had one go bad thats why i use them in my jeep and other cars. It's not a power increase thing they just seem to go forever and i like reliability so i quit using Champion. I am a fan of Japanese made stuff it's quality and it lasts.
Exactly nail-on-head
When I can run an NGK plug for months on a 2 stroke race motor without having to change the plug (due to failure /fouling) that speaks volumes to me. In fact, the only time I swapped in new NGK plugs was bc I felt like it & just figured it was time.
But as I said,
There are applications where champion plugs seem to shine.
Case in point,
I have a 1958 Ford 641 Workmaster tractor that runs best on champion plugs. Iíve tried numerous brands & end up with issues- missing, hard starting, poor idle characteristics, etc.
Iím not exactly sure why? But on my Ford tractor it only gets champion plugs. So I can understand why people will only run champion plugs in their heeps.
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Old 07-16-2018, 11:24 AM   #9
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I'm running bosch iridium's, so far so good.

In my snowmobiles I refuse to run anything but NGKs...
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Old 07-16-2018, 04:28 PM   #10
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I've tried the fancy ones in the past, I just changed back to Champion Copper RC12LYC from platinum this past weekend and my 4.2 runs noticeably better. Gapped at .045 for my HEI.
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Old 07-16-2018, 06:39 PM   #11
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Quote:
Originally Posted by 94Wranglerette View Post
I'm running bosch iridium's, so far so good.

In my snowmobiles I refuse to run anything but NGKs...



I hear that bosch iridiums run well in the newer 4.0's with coil packs but the older 4.0's with a distributor and single coil dont like them. I thought about using NGK iridiums in the past but never tried them because of the stuff i heard about Bosch iridiums in older 4.0's. The cheap NGK V Powers will run forever and back anyways so i run them in everything.



4.0L Iridium Spark Plugs? - JeepForum.com
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Old 07-16-2018, 07:27 PM   #12
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My '94 seems to run fine with them. The reason I decided to try them is my 2 four stroke snowmobiles require them, so I figured why not... I'll pull them in the fall to take a looksy...

I also added a hotter coil(Accel Performance) and good wires(MSD Super Conductor 8.5mm) which may have helped....
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Old 07-16-2018, 09:51 PM   #13
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The NGK Iridiums are completely different animals than the Bosch Iridiums.
The NGK's are fantastic.
Bosch eh not so much. At least in my experience. I've just had to many issues with Bosch products to ever trust them again.
If you can get Bosch products to work for you- then thats great, run what you like.
You'll be seeing NGK in mine
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Old 07-16-2018, 10:04 PM   #14
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I'll see how they're burning after some more miles. Just put them in this spring. Ur right tho, I've never had issues with NGK no matter what I've installed them in...

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