Moparts
Are Champion RJ12YC's junk ?
Posted By: jcastle1
Are Champion RJ12YC's junk ? - 06/12/08 04:13 AM
I just installed a new set of Champion rj12yc spark plugs which I have been using for years and THREE are fouled out.Is there a better plug for a hot 383?Here's the combo:
.030 12.5-1 trw dome(heavy slugs)
free floating pins
zero deck block
906 78cc heads(bowl blended)
6-barrel setup(promax base plates)
509,soon to be racer brown sth-42 cam
msd ign.
4-speed
4.10-1 gear
Posted By: 72d100
Re: Are Champion RJ12YC's junk ? - 06/12/08 04:26 AM
yes, them champions are junk, my truck wasnt getting any fire at all with them and its a bone stock 400. i switched to bosch platinums and it runs like a champ now.
Posted By: jcastle1
Re: Are Champion RJ12YC's junk ? - 06/12/08 05:00 AM
There are a sea of spark plugs out there and I don't know the differences,I just want a good plug to run in my combo.There are platinum tipped,double platinum tipped,v-power,irridium,non-resistor,resistor,and Jegs carries the plugs without a j-strap,whatever that means!
Someone please enlighten me!Thanks,John
Posted By: elmor
Re: Are Champion RJ12YC's junk ? - 06/12/08 05:21 AM
I've always run # 85 Autolites in all my big blocks. They work great.
Posted By: 451Mopar
Re: Are Champion RJ12YC's junk ? - 06/12/08 08:34 AM
My favorate is the NGK V-Power, and they are fairly inexpensive too.
Posted By: therocks
Re: Are Champion RJ12YC's junk ? - 06/12/08 10:24 AM
Champions in the new Mopars and Autolites in the old.Ive never seen a Bosch plug run good in anything yet.Ive changed thousands at work because they are crap and cars run bad with them.If you got a car to run good with them go buy a lottery ticket.Rocky
Posted By: GTX70sixpack
Re: Are Champion RJ12YC's junk ? - 06/12/08 10:41 AM
Autolite and NGK, the platnums work great
Posted By: Anonymous
Re: Are Champion RJ12YC's junk ? - 06/12/08 10:46 AM
This may not be any help but I have found the Champions to work well in stock small blocks and Autolites to work well in stock big blocks. Being a non-stock six-pack may require something different.
Posted By: BigTerry
Re: Are Champion RJ12YC's junk ? - 06/12/08 10:48 AM
what the scoop on E plugs?
Posted By: mopowergtx
Re: Are Champion RJ12YC's junk ? - 06/12/08 12:25 PM
Yep Champions are junk, thats why they were the OE plug when these cars were new.
I think your problem is running a resistor plug in that motor in the first place. Find a non-resistor plug in the heat range you want and try that. I run old NOS J11Y Champions and have never had a problem. But you pick any manufacture you want and find out for yourself which one you like because anytime somebody asks about spark plugs on here you get a different answer. Its about like asking which beer is the best.
Posted By: mark7171
Re: Are Champion RJ12YC's junk ? - 06/12/08 12:26 PM
i use the rj12yc's in the 440, it runs fine. my 5/8" 440 plug is the bosch HR8BPX . i remove the tapper on a lathe.
the autolite 9323's, in the 318 with great results and a 5/8" plug.
Posted By: mark7171
Re: Are Champion RJ12YC's junk ? - 06/12/08 12:30 PM
champion has not made j11y's, superseeded by RJ12YC
all have resistors now.
Posted By: 69Cuda340S
Re: Are Champion RJ12YC's junk ? - 06/12/08 12:38 PM
Standard Autolite copper in my 340 and it runs strong.
Posted By: Anonymous
Re: Are Champion RJ12YC's junk ? - 06/12/08 12:41 PM
Quote:
champion has not made j11y's, superseeded by RJ12YC
all have resistors now.
um.. wrong. you can still get non-resistor champions all-day-long.
Posted By: mark7171
Re: Are Champion RJ12YC's junk ? - 06/12/08 12:47 PM
where?
Posted By: Anonymous
Re: Are Champion RJ12YC's junk ? - 06/12/08 12:50 PM
Posted By: mark7171
Re: Are Champion RJ12YC's junk ? - 06/12/08 12:52 PM
no wonder autozone doesnt have them.
Posted By: JohnRR
Re: Are Champion RJ12YC's junk ? - 06/12/08 12:56 PM
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Yep Champions are junk, thats why they were the OE plug when these cars were new. I think your problem is running a resistor plug in that motor in the first place. Find a non-resistor plug in the heat range you want and try that. I run old NOS J11Y Champions and have never had a problem. But you pick any manufacture you want and find out for yourself which one you like because anytime somebody asks about spark plugs on here you get a different answer. Its about like asking which beer is the best.
the champions that were installed in the 60's/70's are a much better plug than the new champions , never had good luck running that rj12 in anything either .
Posted By: mopowergtx
Re: Are Champion RJ12YC's junk ? - 06/12/08 01:04 PM
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Yep Champions are junk, thats why they were the OE plug when these cars were new. I think your problem is running a resistor plug in that motor in the first place. Find a non-resistor plug in the heat range you want and try that. I run old NOS J11Y Champions and have never had a problem. But you pick any manufacture you want and find out for yourself which one you like because anytime somebody asks about spark plugs on here you get a different answer. Its about like asking which beer is the best.
the champions that were installed in the 60's/70's are a much better plug than the new champions , never had good luck running that rj12 in anything either .
Probably right John, but I still got 4 sets of the vintage NOS J11Y's left. 
But I still have never seen anybody have any real luck running a resistor plug on a beefed up mill running alot squeeze and a hot ignition. Seems like whatever brand they run the stupid resistors burn out of them with quick.
Posted By: cyphre666
Re: Are Champion RJ12YC's junk ? - 06/12/08 01:13 PM
Autolites for me
Posted By: mopowergtx
Re: Are Champion RJ12YC's junk ? - 06/12/08 01:17 PM
Heres a link to the new non-resistor Champion comparable to the old J11Y, the C at the end is for Copper and thats pretty much the same heat range. Now I've never run them just saying they are out there, on planet earth.
And the new ones quality compared to the old(60's-70's) is unknow personally by me from experience.
J12YC Champions
Posted By: JohnRR
Re: Are Champion RJ12YC's junk ? - 06/12/08 01:23 PM
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Yep Champions are junk, thats why they were the OE plug when these cars were new. I think your problem is running a resistor plug in that motor in the first place. Find a non-resistor plug in the heat range you want and try that. I run old NOS J11Y Champions and have never had a problem. But you pick any manufacture you want and find out for yourself which one you like because anytime somebody asks about spark plugs on here you get a different answer. Its about like asking which beer is the best.
the champions that were installed in the 60's/70's are a much better plug than the new champions , never had good luck running that rj12 in anything either .
Probably right John, but I still got 4 sets of the vintage NOS J11Y's left.
But I still have never seen anybody have any real luck running a resistor plug on a beefed up mill running alot squeeze and a hot ignition. Seems like whatever brand they run the stupid resistors burn out of them with quick.
i have a few NOS sets of 11's and 10's .
maybe its the resistor but i never had luck wit hthem on stock performance big blocks . my dart had a set of them on it when i got it , it was the first thing i swapped out .
Posted By: mark7171
Re: Are Champion RJ12YC's junk ? - 06/12/08 01:41 PM
what about suppressor plugs?
Posted By: W5Duster436
Re: Are Champion RJ12YC's junk ? - 06/12/08 02:14 PM
What would be the best plug to run in a 340 with 11.5:1 and solid lift w/mallory hyfire VI-AL ignition?
Just getting ready to fire it up and want to make sure I get the best plug. Also isn't the gap supposed to be .040-.045 with the hot ignition modules?
Posted By: Mr.Yuck
Re: Are Champion RJ12YC's junk ? - 06/12/08 02:55 PM
I swapped from Champs to Autolites a few years back. I really didn't notice much of a difference except that the Auto's seem to get rustier quicker. People swear by them.
Posted By: mopars4ever
Re: Are Champion RJ12YC's junk ? - 06/12/08 03:01 PM
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I swapped from Champs to Autolites a few years back. I really didn't notice much of a difference except that the Auto's seem to get rustier quicker. People swear by them.
Posted By: Pyper70
Re: Are Champion RJ12YC's junk ? - 06/12/08 03:21 PM
I ran Splitfires on my slant and she loved it, Ran Bosch Plat's on the 70 R/T 440 and she stumbled, took her back to Champions and she ran like a champ....I currently have Champions in the 69 R/T now and have 12YC spares. They seem work just right with my combo....with the 509, eddy, dual quads and a hotter cam I am going with NGK
Posted By: OLD318
Re: Are Champion RJ12YC's junk ? - 06/12/08 03:22 PM
I would'nt give you a nickel for a new
champion plug..
Use AutoLite.... or AC Delco...
Posted By: mrmopardan
Re: Are Champion RJ12YC's junk ? - 06/12/08 03:29 PM
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My favorate is the NGK V-Power, and they are fairly inexpensive too.
Tried them all. I will use nothing else but NGK's 
Posted By: MadMatt
Re: Are Champion RJ12YC's junk ? - 06/12/08 04:18 PM
I switched from Champion N9YC to NGK BP6ES on my fairly stout 360 and there was a substantial improvement. I'm also running an MSD 6AL and IIRC MSD specifically recommends AGAINST running platinum plugs. I'm not sure if that is true with any other aftermarket ignition systems.
Posted By: DusterKrazy
Re: Are Champion RJ12YC's junk ? - 06/12/08 11:34 PM
Quote:
What would be the best plug to run in a 340 with 11.5:1 and solid lift w/mallory hyfire VI-AL ignition?
Just getting ready to fire it up and want to make sure I get the best plug. Also isn't the gap supposed to be .040-.045 with the hot ignition modules?
Yes! Always run a larger gap with the ignition box systems. I do on my drag car and it works great. Hard to reccomend a specific plug though because ask 5 different people and get 5 different answers...
Posted By: BobR
Re: Are Champion RJ12YC's junk ? - 06/13/08 12:31 AM
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I switched from Champion N9YC to NGK BP6ES on my fairly stout 360 and there was a substantial improvement. I'm also running an MSD 6AL and IIRC MSD specifically recommends AGAINST running platinum plugs. I'm not sure if that is true with any other aftermarket ignition systems.
Good advice. Don't use platinums with MSD. The 12 heat range plug is too hot for 12.5-1 compression. You need the 9 series equivalent or cooler. I also like NGK or Autolite racing with the strap cut back. If you foul a 9 series plug you have some tuning issues. I recommend an Autolite AR23. -Bob
Posted By: craigerlitz
Re: Are Champion RJ12YC's junk ? - 06/13/08 02:54 AM
Quote:
I would'nt give you a nickel for a new
champion plug..
Use AutoLite.... or AC Delco...
Funny, I wouldn't give you a penny for a set of autolites. Never had any luck with them in a 2.5L, 3.9L, 318, 360, or 440. I'll stick with the Champions.
Posted By: Anonymous
Re: Are Champion RJ12YC's junk ? - 06/13/08 02:58 AM
i wonder which has more ZDDP (zinc) content.. champions or autolites? 
Posted By: BobR
Re: Are Champion RJ12YC's junk ? - 06/13/08 03:20 AM
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i wonder which has more ZDDP (zinc) content.. champions or autolites?
I don't know but I do know that every racer I'm involved with either uses Autolite racing plugs or NGK's. -Bob
Posted By: Anonymous
Re: Are Champion RJ12YC's junk ? - 06/13/08 03:28 AM
personal preference i guess. if one finds a plug that works well, no reason not to use it.
Posted By: jcastle1
Re: Are Champion RJ12YC's junk ? - 06/13/08 04:54 AM
Thanks Bob,Do I have to cut the strap back?
Posted By: mopowergtx
Re: Are Champion RJ12YC's junk ? - 06/13/08 02:35 PM
Quote:
i wonder which has more ZDDP (zinc) content.. champions or autolites?
And everybody knows Budweiser in the bottle is the best beer out there.
Posted By: BobR
Re: Are Champion RJ12YC's junk ? - 06/13/08 02:57 PM
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Thanks Bob,Do I have to cut the strap back?
The AR23 plugs come this way OOTB. -Bob
Posted By: CHRGR69
Re: Are Champion RJ12YC's junk ? - 06/13/08 03:10 PM
I always find a set of NOS Mopar/Champion plugs for the big blocks on Ebay. They work fine. Maybe its because they are NOS!
Posted By: MadMatt
Re: Are Champion RJ12YC's junk ? - 06/13/08 03:56 PM
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I also like NGK or Autolite racing with the strap cut back.
I've never tried that. How far back do you cut them? What do you use to cut them? Anybody have a photo of a cutback plug?
Matt
Posted By: FurryStump
Re: Are Champion RJ12YC's junk ? - 06/13/08 04:07 PM
I run AR3910 Autolites, they come with the cut back electrode. They seem to run fine,. You have to be careful gapping them to keep the feeler gauge perpedicular to the center electrode.
Posted By: 500ciDuster
Re: Are Champion RJ12YC's junk ? - 06/13/08 05:05 PM
Yes, they are junk! They seem to foul the easiest from gas & oil,that's what I've seen for the last 30 years
Mitch
Posted By: mopowergtx
Re: Are Champion RJ12YC's junk ? - 06/14/08 12:00 AM
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i wonder which has more ZDDP (zinc) content.. champions or autolites?
And everybody knows Budweiser in the bottle is the best beer out there.
the best beer in the world only when its brewed in canada eh... 
for the REST of you as far as champions suck(ing), if your engine isn't up to par tune wise,
yah.. champions are not very forgiving.
Ok well if we include our Canadian friends in this, "real" Lablat's Blue is mighty tasty too.
Posted By: jcastle1
Re: Are Champion RJ12YC's junk ? - 06/14/08 02:42 AM
This reply is freakin hilarious:
champion has not made j11y's, superseeded by RJ12YC
all have resistors now.
um.. wrong. you can still get non-resistor champions all-day-long.
where?
earth
no wonder autozone doesnt have them.
Posted By: GTX MATT
Re: Are Champion RJ12YC's junk ? - 06/14/08 03:19 PM
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Yep Champions are junk, thats why they were the OE plug when these cars were new. I think your problem is running a resistor plug in that motor in the first place. Find a non-resistor plug in the heat range you want and try that. I run old NOS J11Y Champions and have never had a problem. But you pick any manufacture you want and find out for yourself which one you like because anytime somebody asks about spark plugs on here you get a different answer. Its about like asking which beer is the best.
the champions that were installed in the 60's/70's are a much better plug than the new champions , never had good luck running that rj12 in anything either .
My GTX with a fresh 440, about 9.5:1 compression, stock everything except the Mopar 272 cam fouled the RJ12YCs like crazy. With the timing set at 6 degrees or so initial I think it would have been fine, but as soon as I advanced it to about 12 or 13 you could visually see the dark smoke start to pour out of the exhaust pipes. I think theyre probably good if you tune your car to stock specs/
The Champions I put in my 273 to replaced the fouled Autolites in it fouled up within two days. I changed the points, condensor, rotor, cap, adjusted the timing to a tad more intial than stock. Pulled the plugs two days later to change them (I had been driving the car) and they looked like I just pulled them fresh out of the box. Tune them to stock specs in a stockish engine and the Champions are probably perfect. Thats why the factory liked them.
Posted By: BobR
Re: Are Champion RJ12YC's junk ? - 06/14/08 05:14 PM
After reading all of these posts I would like to add one overview. If you are fouling new plugs there is something wrong other than the plug brand. All plug manus make good products. I prefer what I posted for a couple of reasons but none are because I don't think Champion makes a good plug. If you are fouling your plugs on a mechanically sound motor you are either using the wrong heat range or you have tune up problems. -Bob
Posted By: GTX MATT
Re: Are Champion RJ12YC's junk ? - 06/14/08 06:22 PM
Quote:
After reading all of these posts I would like to add one overview. If you are fouling new plugs there is something wrong other than the plug brand. All plug manus make good products. I prefer what I posted for a couple of reasons but none are because I don't think Champion makes a good plug. If you are fouling your plugs on a mechanically sound motor you are either using the wrong heat range or you have tune up problems. -Bob
Exactly my point before
Posted By: RobR
Re: Are Champion RJ12YC's junk ? - 06/14/08 06:33 PM
I can't believe this thread...
just goes to show...there's those who know...those who think they know...and those who don't even suspect.
Come on you guys...really
Posted By: postbody65
Re: Are Champion RJ12YC's junk ? - 06/14/08 07:57 PM
hi everyone been runing the champions rj12yc which edelbrock recomends but they're getting a rust color on them my specs on my engine are 440 .55 over 11 1/2-1 bme aluminum rods .620 solid roller 6 barrel set up with orange box ignition msd coil and wires never had this color before any help
thanks guys
Posted By: BobR
Re: Are Champion RJ12YC's junk ? - 06/14/08 09:21 PM
Quote:
hi everyone been runing the champions rj12yc which edelbrock recomends but they're getting a rust color on them my specs on my engine are 440 .55 over 11 1/2-1 bme aluminum rods .620 solid roller 6 barrel set up with orange box ignition msd coil and wires never had this color before any help
thanks guys
I would have to see but what kind of fuel are you using? Any octane boosters? MMT-methylcyclopentadienyl manganese tricarbonyl(in some fuel and octane boosters) can cause a rust colored deposit. Is the motor running good? Any chance of coolant seepage into your combustion? Any oil consumption?
-Bob
Posted By: Anonymous
Re: Are Champion RJ12YC's junk ? - 06/14/08 09:51 PM
Quote:
After reading all of these posts I would like to add one overview. If you are fouling new plugs there is something wrong other than the plug brand. ....If you are fouling your plugs on a mechanically sound motor you are either using the wrong heat range or you have tune up problems. -Bob
i said that earlier in this STUPID thread. perhaps the masses will listen to you.
Posted By: postbody65
Re: Are Champion RJ12YC's junk ? - 06/14/08 10:58 PM
no water in chambers no oil consumption have been using vp booster with sunoco 93 octane runs great no misses but have always wondered about the cut back plugs
thanks
Posted By: Anonymous
Re: Are Champion RJ12YC's junk ? - 06/14/08 11:24 PM
helps promote a more uniform flame travel. IE: more stable, thus minimizing the chance of detonation.
thats the only thing proven to work. V-grooves~U-grooves~slit ground electrodes~etc are all marketing gimmics.
Platnium~Uridium~Titanium~etc tip plugs DO NOT promote a better spark, but are super hard and VERY wear resistant.
hence the "go 60k without changing them" statements. Also there 3,5,7 times more $$$ then conventional plugs.
now, i buy my CHAMPION J12YC for $3/pair, and change em once every couple of years regaurdless of milage, and
i also inspect them twice a year, just to make sure there are ZERO problems. If one plans on keeping there
plugs in there small/big block MoPar for more then say 8000 miles, you gotta be
Posted By: 500ciDuster
Re: Are Champion RJ12YC's junk ? - 06/15/08 02:05 AM
I had an 70 duster beater car which had a weak 318 engine and did burn some oil and I put new champions in it which fouled almost imediatly so everybody said put hotter heat range in so I special ordered some 16's and they fouled as fast as the 12's so then I tried autolites and it ran till I junked it, I think it had motercrafts before I changed to the champions and I didn't change the plugs because they were fouled it was just a tune up.This was in 1980 so maybe they have made a better product but it just left a bad taste for me, I have used autolites in other worn engines with great results.I don't claim to be a know -it-all but this is just some personal experiances.
Mitch
Posted By: BobR
Re: Are Champion RJ12YC's junk ? - 06/15/08 03:15 AM
"have been using vp booster with sunoco 93 octane"
I'd bet a buck that the booster has MMT in it. If it does you've found your culprit. -Bob
Posted By: DaytonaTurbo
Re: Are Champion RJ12YC's junk ? - 06/15/08 04:45 AM
I used to run champions, but switched to autolites. I noted no difference between the two. Both stay good just as long.
Posted By: 6packattk
Re: Are Champion RJ12YC's junk ? - 06/15/08 05:09 AM
Fuel,air,electrical,fuel in the 80`s is better than the water we run now,fuel in the sixties(lead) better than racing fuel now.Autolites in my big blocks since the 70`s,ran ngk`s only in my motorcycles,now will run in my bee,still correct heat range,gap,fuel and air will run for long time,oil fired or fuel deluted won`t,had to say something after reading this post this far......amazing but autolites run longer with oiling problem than champs but champs still make the best race plug
OK good night
Posted By: 70Cuda383
Re: Are Champion RJ12YC's junk ? - 06/15/08 05:59 AM
Quote:
I can't believe this thread... just goes to show...there's those who know...those who think they know...and those who don't even suspect.
Come on you guys...really
so, are you refering to the beer comments? cause some of those have been WAY out there! not one person mentioned any German or Irish beers!
now that's just silly!
Posted By: Viol8r
Re: Are Champion RJ12YC's junk ? - 06/16/08 05:06 PM
Quote:
hi everyone been runing the champions rj12yc which edelbrock recomends but they're getting a rust color on them my specs on my engine are 440 .55 over 11 1/2-1 bme aluminum rods .620 solid roller 6 barrel set up with orange box ignition msd coil and wires never had this color before any help
thanks guys
If you are saying you have a 11.5-1 motor. That is too hot of a plug. You should be in the 9 range. The rust spots are from detontation.
Posted By: Stationwagonguy
Re: Are Champion RJ12YC's junk ? - 06/16/08 05:48 PM
Just saving this thread to my favorites for future perusal, ignore me. :lol: I want to remember the autolites and give them a try, the Champions have been driving me insane in my 300 for years, they foul out perpetually, like a bad joke.
Posted By: BSB67
Re: Are Champion RJ12YC's junk ? - 06/16/08 11:01 PM
Quote:
If you are saying you have a 11.5-1 motor. That is too hot of a plug. You should be in the 9 range. The rust spots are from detontation.
I have not had problems using Champion plugs in many applications. However, I have not been able to run that plug (too hot)in either of my two 10:1 CR big blocks.
Posted By: BigBlockMopar
Re: Are Champion RJ12YC's junk ? - 06/16/08 11:03 PM
The only thing I do with Champion-plugs if I find them anywhere in my engines or garage, is to toss them as hard and far away as possible.
I'm using Accel-plugs in every bigblock I have, 'cept the Eddy-headed stroker motor I run now, and never had any problems with them whatsoever.
Heck, I can't even remember when the last time was I replaced a set of these yellow buggers in an engine anymore.
Why Accels?
Well next to their immaculate state of operation, the price is also right. I get them kinda for free.
Posted By: HemiGreg
Re: Are Champion RJ12YC's junk ? - 06/16/08 11:44 PM
well add some ACETONE and it will cure your plug problems...
LOL!!!!!
really- I prefer running the Champ surface gap plugs-like the ones for marine applications alsop same upgrades for the vipers but short reach.
oh and never run a resirtor plug in a high comp engine, as the cyl press gets higher the spark has more resistance to jump the gap-so as the gap resistance increases so does the series resistance of the plugs resistor and wire resistance to a point ehere you can loose 1/2 your spark power in the wire and plug alone.
simple balanced bridge ohm law with a littke dielectric constant throen in
Posted By: jcastle1
Re: Are Champion RJ12YC's junk ? - 06/18/08 03:07 AM
Has anyone used the Autolite 75's instead of the rj12yc?
These are listed as a non-resistor replacement for the Autolite 85's.
Posted By: jcastle1
Re: Are Champion RJ12YC's junk ? - 06/18/08 03:08 AM
Anyone know if the j63's by Champion are a 3/8" reach plug?
Posted By: jcastle1
Re: Are Champion RJ12YC's junk ? - 06/18/08 03:11 AM
Can anyone tell me what the difference is between the resistor style and non-resistor style spark plugs?
I am confused as to what that actually means,if this is in the wrong section ,please let me know!
Posted By: Anonymous
Re: Are Champion RJ12YC's junk ? - 06/18/08 03:17 AM
non-resistor plug has a solid core.
resitor plug has a wire coil and a gap inside it.
Posted By: 6T9Hemi
Re: Are Champion RJ12YC's junk ? - 06/18/08 12:31 PM
Bottom of the pile in my opinion. I did testing back in my racing days and Champion had the most resistance of all the plugs tested. NGKs tested the best.
Posted By: ZIPPY
Re: Are Champion RJ12YC's junk ? - 06/18/08 02:21 PM
Given the limited use of my GTX, several years ago when it had iron heads I used to be able to get at least two seasons of use out of a set of Champions and they were rj12yc. After that, I would change them because they were rusty on the outside, not because they weren't firing.
In the 13 or so years I ran that same iron head 440, I never had a problem with the spark plugs that I couldn't blame on fuel delivery or another part of the ignition.
Some applications might have some magic or voodoo in spark plug selection, but I've never seen it. A spark plug either fires properly every time, or it doesn't. It's either the right heat range, or it isn't.
Posted By: HotRodDave
Re: Are Champion RJ12YC's junk ? - 06/18/08 03:31 PM
Just had a 2000 maxima today come in, it was shakeing at idle and kept sending cylinder 2 missfire and random misfire codes. Guy had recently done a tune-up and so I didn't look at the plugs first. I checked all the conectors and coils and such and nothing fixed it, finally I pulled the plugs and the center electrode on number 2 had fallen out of the plug! I quickly threw in an old plug laying around the shop and it was still shakeing but not sending misfire codes. Ordered a new set of NGKs and it was smoothe as glass.
The plugs he had put in just a few miles earlier were... drum roll... bosche platnium crap plugs! I have seen this exact scenario, except the electrode falling out, over and over and over. Some one will put in bosche plugs and make there car run worse. Never seen this problem from any other plugs.
Posted By: LL340Rag
Re: Are Champion RJ12YC's junk ? - 06/18/08 04:09 PM
They are really hard to find but the only plug I have never had a problem with is a Nippondenso. I run them in everything from my lawn mower, mopars, Volkswagon and BMW's. I haven't had a foul out in years even running a 2 two stroke mix in a 4 stoke mower (I ran out of gas).
Posted By: patrick
Re: Are Champion RJ12YC's junk ? - 06/18/08 05:06 PM
I run RN12's IIRC in my 360, never had a problem with champion plugs, ever. my bike ran rougher with bosch's than it did with the OEM champions.
Posted By: Black_Sheep
Re: Are Champion RJ12YC's junk ? - 06/18/08 07:11 PM
Champions never seemed to last very long in Mopar big blocks, I gave up on them in the late 70's...
Posted By: volaredon
Re: Are Champion RJ12YC's junk ? - 06/20/08 07:11 PM
Posted By: roadrunner7070
Re: Are Champion RJ12YC's junk ? - 08/21/08 03:10 PM
Quote:
champion has not made j11y's, superseeded by RJ12YC
all have resistors now.
J12Y's are a hotter plug and not the same as J11Y's.
Posted By: capac
Re: Are Champion RJ12YC's junk ? - 08/21/08 03:42 PM
Quote:
Quote:
I would'nt give you a nickel for a new
champion plug..
Use AutoLite.... or AC Delco...
Funny, I wouldn't give you a penny for a set of autolites. Never had any luck with them in a 2.5L, 3.9L, 318, 360, or 440. I'll stick with the Champions.
Autolites won't even last 1 week in my 383. Thought I would save a buck, but back to champions it was. Maybee the manufacture did know something....
Posted By: NachoRT74
Re: Are Champion RJ12YC's junk ? - 08/22/08 06:43 PM
Quote:
This reply is freakin hilarious:
champion has not made j11y's, superseeded by RJ12YC
all have resistors now.
um.. wrong. you can still get non-resistor champions all-day-long.
where?
earth
no wonder autozone doesnt have them.
hard to find but you still can find them down here in Venezuela... in fact what is really imposible is try to get them with resistor.
about plug itself. I have no claim with them... just one failed in 8 years. maybe better performance in others, yes, but they work just fine on any street car as they were mounted from factory purpuose.
Posted By: jcastle1
Re: Are Champion RJ12YC's junk ? - 08/23/08 01:49 AM
Thanks for all the replies,I ended up buying up several sets of the j12y non-resistor Champions.
What I've since learned is if your carbs are not dialed in,spark plugs don't mean jack.
I've been trying to do the six-pak on a budget approach and I've learned way more than I ever cared to know about them.No wonder many said they are troublesome,it's a pain in the butt just getting them off the manifold!
Posted By: Anonymous
Re: Are Champion RJ12YC's junk ? - 08/24/08 04:07 PM
OMG.....you see the light.
Sorry but, I ran a 6pk setup with tons of problems, swithced to a 3310 carb eddy intake on my 383, ran better and stronger....plugs....never a lick of trouble with rj12yc's, but, i do run an accel coil....maybe the champs want more spark to stay clean as one post previously said about a higher resistance. good luck and just keep trying things to find what YOUR combo WANTS.
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