Carb Replacement Advice for '79 CJ-5

[gadawg31]

Ok, after a long time away from my jeep project, I have freed up a little time to start working on the ol girl a little bit. I have a '79 CJ5 , AMC 258 i6 / 4.2l inline 6cyl and it has a 2bbl Carter carb. (NOTE: I don't know if this is original or not.) One big concern I have is with the carburetor. Currently it has a Carter 2bbl, unknown model (since the tag is missing). I will try and post a pic of it, but for now I am considering replacing with a new or rebuilt carb. Anyone have any favorites, special feeling towards a specific 2bbl or 1bbl. I would like to stay close to what is on it now, so my cost are kept down a little. Any and all info will be greatly appreciated. Thanks.

JD

 

[jpeck71]

I don't have any real experience with carbs, still learning myself, but the little research I have done leads me to believe that 79 was the first year for 2bbl carters. I have a 78 with a 1bbl carter.

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[harleydragon]

cheapest thing would probably be to rebuild that one..best working carb I ever had on a AMC 258 i6 / 4.2l was a 2 barrel holley..many people use the motorcraft,I believe 2150 on AMC 258 i6 / 4.2l 's

 

[gadawg31]

Yea, I have been all over the forum and a lot of chatter seems to lead me to replacing it with an MC2100. I am just wanting to get some more opinions as to what everyone else has had luck with. I am researching the junk yard option now, since this would save me some bucks on a rebuild vs new. Just not sure if this is the route I want to take.

JD

 

[mtnwhlr]

My vote is the MC2100 also. There was the carb guy on Ebay selling rebuilt ones in a kit for the Jeep AMC 258 i6 / 4.2l .

 

[gadawg31]

Ok, I just found this autoline carb at Autozone and it appears to be an exact copy of my carter that is on my '79 CJ5 , 258L engine. My problem is that when I got this jeep, the carb was off and all the hose were missing from the engine. I managed to piece mill them back on and hooked what I thought was the right one to the carb. Can anyone tell me what hose go where on the attached pics? A little about my jeep is that I have no charcoal canister, absolutely no emissions pumps or controls, just a plain jane engine compartment. All info will be greatly appreciated. Thanks.
JD

 

[IOPort51]

Ok, I just found this autoline carb at Autozone and it appears to be an exact copy of my carter that is on my '79 CJ5 , 258L engine. My problem is that when I got this jeep, the carb was off and all the hose were missing from the engine. I managed to piece mill them back on and hooked what I thought was the right one to the carb. Can anyone tell me what hose go where on the attached pics? A little about my jeep is that I have no charcoal canister, absolutely no emissions pumps or controls, just a plain jane engine compartment. All info will be greatly appreciated. Thanks.
JD

Is it just me or is there something strange about an Autolite carb that is identical to a Carter?

I vote for the MC2100/2150. You can find a core at a PYP grave yard and a rebuild kit and do the whole thing for less than $75 and it's fun. If you don't know anything about carbs it is about time you learn.

 

[gadawg31]

I have been looking for a junked 2100 ever since I posted this thread and no-one has any. I have feelers out to adjoining states junkyards and so far two have replied with none available. Apparently they have become very hard to find and that was were I was going, until I saw the autolite. I don't mind rebuilding one and I am very capable, just would have problems tuning it. This is why I was contemplating sending my carter out for rebuild for $AMC 150 .00. Either way, if I can't find the 2100, I am still stuck with not knowing where all the hoses go. Back to original question.

JD

 

[mtnwhlr]

New Motorcraft 2150 Jeep AMC Eagle Pacer Carb Upgrade 258 4 2 1 08 Venturis | eBay
Here is what I found on a quick search.

 

[davey25]

My 78 is a 1bbl too..I just picked up two 2100s for 10 bucks with a rebuild kit..not bad

 

[gadawg31]

mtnwhlr, I have found new ones as well online but I am looking to cut my costs. If I could find a junk one and get it rebuilt, that would be great; however I would still be in the same boat as I am now. I don't have any info on where all the lines hook up. Whether I get my carter rebuilt or get an MC, I still need a diagram for hooking up the lines. Does anybody have a carter or MC2100 on their jeep that could take a couple of pics or even tell me how they hooked theirs up?

davey25, mine is a 2bbl carter not a 1bbl.

JD

 

[Torxhead]

There are two types of vacumn ports coming out of the carb, manifold and ported. With a little research you could figure out what goes where. Such as the distributor gets a manifold hookup for its vacumn advance, power brakes also. Good luck

 

[Hedgehog]

I would suggest rather than looking for the 2100, go for the 2150. They are both similar or the same carb with the 2150 having automatic altitude compensating built in. While researching my V8 360 I found that it has a 2150 which was reviewed very favorably. I know quite a few guys really like the 2100 on their I-6's, with the 2150 being for all practical purposes the same carberator with a littl extra bonus for altitude it seems like a no brainer. By the way the altitude adjustment mechanism is not computerized in any way. It just sits there quietly doing its job.

 

[gadawg31]

Thanks Hedgehog. I guess my original post was advice on carbs, that turned into connection advise, so sorry for combining the two thoughts but they do go together. I guess it is easy to post on someone's thread that you can reseach and find the information, but I thought that was what I was doing here is researching. I apprectiate you comments and did not know that about the 2150. I was given some bad info and thought it was electronic, meaning computer related. That may be the route to go, if I don't get the carter rebuilt. There is a company in Pinellas, FL that will rebuilt my carter for $110 w/1yr warranty. I believe this will be my most economical avenue. I guess I could ask them about the different ports on the carb, since they are carb experts. Thanks for the info/advise.

JD

 

[Hedgehog]

I wasn't quite sure. The original post was about choosing a carb. Then it looked like you bought one already. After that carb. advice AND where hoses are suposed to go came into play. I did read the whole thread, but thought, "Why not mention the 2150?"

About the 2150 being electronic. Someone mentioned that to me as well. As it turned out, on an '82 Wagoneer the only electronic engine part is the distributor. Other than the electric choke the 2150 is electronic free.

I agree, your best route is to have a good shop rebuild your old carb. They can clean out the old gunk and sleeve the shafts to make your carb as good as new. Routing vatious lines should be fairly easy. There are a couple that relate to the carbs. proper venting of gas fumes or float over flow ports. Others are vacuum ports. If you don't have any emissions most of the ports can be plugged.

 

[mtnwhlr]

Such as the distributor gets a manifold hookup for its vacumn advance, power brakes also. Good luck

I have to disagree with this, the distributor gets ported vacumn it hooks to the port at the top of the carb.

 

[gadawg31]

Thank guys for the input and advice. When it comes to the world of carb and vacumn ports, my mechanical skills start to elude me. I have searched numerous threads and found tons of pics that have similar carbs, but I am not quite sure of the hoses. I decided today, after talking to the guys down in FL, that I will take my carter off and have them rebuild it. From what I have gathered so far is this, so please correct me if I have them placed wrong: large port on base of carb - PCV valve front of valve cover (plug or place vent filter in rear port of valve cover), small port on base of carb - distributor vacumn advance, large port on top of carb w/plastic cover - egr valve (don't have one on my vehicle, so I guess I would plug this port??), all other ports on carb plug (I think). I noticed in several pics that the gas return line was not going to the carb at all, unless I am missing something here, so how does that line hook up? Finally, choke port on carb - hooks to second nipple on PCV valve on front of valve cover. Ok, you experts check my homework and see if I failed or if I am close. Thanks.

PS: I took the original pics of my carter and labeled each port, as I understand from different threads. Let me know what you think.

JD

 

[Hedgehog]

I know this is a lost concept in this day and age but .... ohhh I'm going to get myself in trouble for this .... you could buy a manual that shows all this stuff. Believe it or not spending money, yes even today, on an actual Jeep manual can save you money and especially time in the long run.

 

[mtnwhlr]

I own a Chilton for every thing I own ^^^ good advice

 

[davey25]

I would suggest rather than looking for the 2100, go for the 2150. They are both similar or the same carb with the 2150 having automatic altitude compensating built in. While researching my V8 360 I found that it has a 2150 which was reviewed very favorably. I know quite a few guys really like the 2100 on their I-6's, with the 2150 being for all practical purposes the same carberator with a littl extra bonus for altitude it seems like a no brainer. By the way the altitude adjustment mechanism is not computerized in any way. It just sits there quietly doing its job.

I don't believe just because it is a 2150 it is altitude compensating..only some versions were..I believe the 2150 to be a replacement for the 2100