need help Bad-excuse me for being stupid

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trudysduster

trudysduster

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changing plugs in the Duster.the plugs in it now are Champion RV12C. They have been in there 10 years. look ok to me. thought I would get new ones in it. went and bought a new set. decided to keep the same ones in it. did more research on these. It calls for RJ14YC plugs. There is a difference in the reach.RV12C has a .460 and the RJ14YC is a .380 reach. I went on Summit's site and according to the application for the RV12C plugs, they are for a Chevrolet. Now I didn't put these plugs in the car. I was in a rehab hospital when this was done recovering from a brain aneurism/stroke. I just assumed when it was done they put the right plugs in it. This changes things. How much will the difference in reach mean here and also if these plugs have an application for a Chevy, why the hell have they been working so good in the Duster. will I have more power and run better if I go to the RJ14YC that has the difference reach or a different brand plug.
 
the .38 reach is fine. that is about what the factory 452 headed 440's take. autolites are .375 . the .46 is just putting it closer to the piston
 
thanks lance, but does it matter that the RV12C has no application for a Mopar, just chevy. I am ready to go back and get the Autolite 85's. the car ran good with them, I don't want to put something back in that shouldn't be in it.
 
You probably won't notice any difference.
A spark is a spark, for the most part no matter what the actual application is.
The heat range and reach are more important than what they are used in, and in your case they are the same heat range just different reach.
The shorter one will very slightly lower the compression, but like I said you wont notice any difference in the way the car runs between the two.

One thing to consider is that the longer plug could interfere with a piston (apparently not the case on your engine0, but the plug could be getting hotter at the tip than it was designed for because of it not being able to carry the heat off to the head as well as the shorter plug. (More plug exposed to the cylinder and not in contact with the threads in the head.)

Dammit Lance :)
Are you following me?
 
I checked the heat range and they are the same. well, that makes me feel better but don't know how much I like a Chebby plug in it.
 
trudysduster said:
I checked the heat range and they are the same. well, that makes me feel better but don't know how much I like a Chebby plug in it.
Click to expand...
like greg says , just watch your reach , you don't want the piston smacking them , sounds like the 46 has been fine , its got be close though lol
 
ok, I took them back and got the autolite 85's. going to put them in here shortly. have to get this thing up in the air and get them from the bottom. not enough room on top.you gap yours at .035 or do you go .040 for a little more power.
 
My son has a 98 Dakota R/T w/ a 5.9 Magnum. About 3 years ago, in the dead of Winter, it wouldn't start. It would crank just fine but just would not fire. He was living in an apartment and needed this truck to go to school and work so this created some serious issues for him. Since he had replaced the plugs just a few months earlier during the Summer, I first assumed they were good. We tried various tests and everything seemed to be fine with everything else. Mind you we were working outside in about 10 degree weather and after a couple hours, I packed it in for the day.

Then I just did what I always told him, start with the basics, assume nothing. I got the Champion spark plug number from the underhood emissions sticker and on the way to his place the next day, I stopped at a parts store and bought a fresh set of the Chrysler recommended plug. While changing the plugs I noticed that he had put in Autolites and he said that specific number was recommended by guys in the Dakota R/T club. Comparing them side-by-side it was obvious the Champions had considerable more reach than the Autolites. It immediately fired right up like it was summertime. Apparently, the short reach combined with the cold weather was what made the difference. I always use Champion plugs in my rolling junk.

Happy Ending.
He graduated and now the truck is his summer play thing again and only sees nice weather. It's run a 14.20 which isn't bad considering it's 4000 lbs.
The End.
 
A "V" series plug is a TAPERED SEAT plug

A "J" series plug is a GASKETED, FLAT SEAT plug

They are NOT NOT NOT interchangeable.

What do you have for heads? I'm not familiar with some of the late model, IE, Edelbrock, etc, heads. Maybe some of them use tapered seat plugs. All the older B/ RBs used J plugs

Some of the later model motorhome, etc heads used peanut plugs
 

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'Just because it doesn't have a overpriced pentastar on it' bashing isn't productive. You do realize mopar is dead a a couple times over right? Once because they are owned by fiat, and twice because once you touch it, it becomes your brand. :banghead:
 
The heads I believe are the 452 heads. I just went ahead and put the autolite 85's in. that is what it called for at the parts house. That also is what the application from Summit was. I looked up the application for the RV12C and it was all Chevrolet. Hell, I don't know why they were in it. The instructor at the vocational school where my son went 10 years ago did some tuning on it. It had a stock dist. in it and I think they were playing with the weights and stuff in the dist. and he put those plugs in it. I since changed the dist. when I was able to get up again.
 
trudysduster said:
The heads I believe are the 452 heads..
Click to expand...

I found a thread or two on the www that might indicate that the casting number does not tell the story. Look at the plug holes, see if they have a fairly deep chamfer. Some heads do use those plugs.
 
well I put the Autolite 85 plugs in here the other day. changed the carb out with the Thunder series 650 carb and I liked the way it ran. lot better low end torque. thought I was set. Left this morning to go to the car show that was about 25 miles away and just before I got to the show, I noticed the car had what felt like a vibration. A kind of a shake. I noticed when I got in it a little, the ping returned a little. It feels like there is a problem with the plugs not firing right. maybe I have a bad one. any ideas. some say the Autolites are junk. some say their Mopars does not like Autolites. change them. maybe I have a female Mopar engine and she is very particular. Go back to the long reach champions that I had it it, RV12C. Maybe go to a short reach Champion RJ14yc. any suggestions is welcomed.
 
trudysduster said:
I checked the heat range and they are the same. well, that makes me feel better but don't know how much I like a Chebby plug in it.
Click to expand...

They weren't chebbie plugs ther were Champion plugs. Them plugs don't know what they are made for. All they know is to zap when current hits um. lol
 
trudysduster said:
well I put the Autolite 85 plugs in here the other day. changed the carb out with the Thunder series 650 carb and I liked the way it ran. lot better low end torque. thought I was set. Left this morning to go to the car show that was about 25 miles away and just before I got to the show, I noticed the car had what felt like a vibration. A kind of a shake. I noticed when I got in it a little, the ping returned a little. It feels like there is a problem with the plugs not firing right. maybe I have a bad one. any ideas. some say the Autolites are junk. some say their Mopars does not like Autolites. change them. maybe I have a female Mopar engine and she is very particular. Go back to the long reach champions that I had it it, RV12C. Maybe go to a short reach Champion RJ14yc. any suggestions is welcomed.
Click to expand...


What I was tryin' to get to earlier. I don't / haven't had any of the late heads, but from what I've read it appears those heads might have been made either way---for gasketed short reach plugs, or the tapered seat peanut plugs. Generally, they don't interchange

Also, you can not compare heat range between the two types of plugs. Heat range is an arbitrary number. "What might be true" for a 3/4 reach SB plug, example, is not true for a short reach BB/ RB plug.

If you have some way of posting a GOOD clear photo of one of the plug holes, both "empty" and with a peanut plug in place, some of these guys might see what you have.

It still seems to me very likely that if the peanut plugs were in there and ran good for (did you say 10 years?) that they might be the correct reach plugs.
 
KosmicKuda said:
My son has a 98 Dakota R/T w/ a 5.9 Magnum. About 3 years ago, in the dead of Winter, it wouldn't start. It would crank just fine but just would not fire. He was living in an apartment and needed this truck to go to school and work so this created some serious issues for him. Since he had replaced the plugs just a few months earlier during the Summer, I first assumed they were good. We tried various tests and everything seemed to be fine with everything else. Mind you we were working outside in about 10 degree weather and after a couple hours, I packed it in for the day.

Then I just did what I always told him, start with the basics, assume nothing. I got the Champion spark plug number from the underhood emissions sticker and on the way to his place the next day, I stopped at a parts store and bought a fresh set of the Chrysler recommended plug. While changing the plugs I noticed that he had put in Autolites and he said that specific number was recommended by guys in the Dakota R/T club. Comparing them side-by-side it was obvious the Champions had considerable more reach than the Autolites. It immediately fired right up like it was summertime. Apparently, the short reach combined with the cold weather was what made the difference. I always use Champion plugs in my rolling junk.

Happy Ending.
He graduated and now the truck is his summer play thing again and only sees nice weather. It's run a 14.20 which isn't bad considering it's 4000 lbs.
The End.
Click to expand...


I just took the original Champions out of my 99 Dakota (5.2) today. First plug change in 105,000 miles.

You know what I put back in..... A fresh set of the same things that were in it. They lasted over 100k, Im not going to rethink what's working.

That's where people get into trouble, like in your example.

As the old saying goes..... "If it ain't broke, don't fix it."
 
RustyRatRod said:
They weren't chebbie plugs ther were Champion plugs. Them plugs don't know what they are made for. All they know is to zap when current hits um. lol
Click to expand...

Yep.....first I ever heard of a Chebby plug......
 
1968FormulaS340 said:
I just took the original Champions out of my 99 Dakota (5.2) today. First plug change in 105,000 miles.

You know what I put back in..... A fresh set of the same things that were in it. They lasted over 100k, Im not going to rethink what's working.

That's where people get into trouble, like in your example.

As the old saying goes..... "If it ain't broke, don't fix it."
Click to expand...

That's fine and great if you're sure those are what belong in there. There was an issue here some time ago where someone had put the (older) 13/16 hex plugs into a (newer) "peanut plug" /6, and there isn't room for a socket on e'm!!!
 
well, I am not sure that they are what goes in there. I cannot take a pic of the hole. I have enough room to get my hand between the manifold and the shock tower. as far as the chebby plug comment goes, I looked the plug up on Summit's website and the only application for that plug was for a chebby. according to the parts house, it calls for RJ14YC. I am going to look into this next week. we just finished putting a new tranny in juniors Dart Sport tonight and my wife has major surgery Monday morning so right now this is the last thing on the list to do. I appreciate all the help. Bill
 
I read the title of your thread, read the whole thread, notice 1 comment of intelligence made by Bobby and I can honestly say that you yourself said excuse me for being stupid. Well, no problem, but being STUCK ON STUPID is another issue.

Stop being stuck on stupid.

Get the idea of "It's a Chevy plug"'outta your head a d use what the car likes!
There no such thing as a Chevy plug or a Ford plug etc.....

Gawd Danm man!

You wanna use what works. Not what you think is right, AKA, a MoPar plug!
 
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