Best carb for my 304ci 78CJ7

[cj7forfun]

I just bought a 1978 CJ7 that is in fair condition (will post pics asap) but doesn't run that well. After some choke adjustment to the totally worn out motorcraft 2100, I managed to get it to idle but when you apply the gas it chokes out and dies. I'm looking to totally replace the carb with the best possible retrofit. any suggestions from you guys would be much appreciated.

P.S. I live in S.C. so no emmissons to worry about either.

 

[CJim7]

I just bought a 1978 CJ7 that is in fair condition (will post pics asap) but doesn't run that well. After some choke adjustment to the totally worn out motorcraft 2100, I managed to get it to idle but when you apply the gas it chokes out and dies. I'm looking to totally replace the carb with the best possible retrofit. any suggestions from you guys would be much appreciated.

P.S. I live in S.C. so no emmissons to worry about either.

Before you give up on the MC2100, have you checked your timing? The 2100 is a good, proven carb. Might be in your better interest to rebuild it or have it rebuilt by a reputable shop. Or just find another one.

On the other hand, I've had tremendous luck with my Quadrajet. This is an excellent carb as long as you manage to find one that's not worn out at the throttle shaft area (the problem spot). A good Qjet is worth it's weight in gold both on and offroad, a problematic one is no better then a door-stop.

Another option is a simple Edelbrock. They are stupid-easy to adjust and run very well. My only complaint was offroad...in stock form Edelbrock carbs just dont perform well in off camber situations.

 

[derf]

Honesty, it's hard to beat the factory stock Motorcraft. That it, assuming it's tuned properly. The best thing may be to either rebuild the one you have or find a remanufactured one from a parts store.

Along with a good condition carb, new plugs and wires (or even a full up TFI ignition upgrade) and some time with a vacuum gauge tuning the engine should be all you really need.

 

[elwood blues]

I completely agree with CJim7 and derf. The Motorcraft 2100 is a great carburetor when it's running correctly, they're aren't difficult or expensive to rebuild, they're fairly easy to tune and they're a good offroad carb as well.

However, if you are dead set on getting rid of it, probably the easiest route to go would probably be to replace it with a Weber, New 38 DGES Weber Carburetor

 

[jonboy1919]

Elwood, the Weber Carb you reference, is the application on a 304cid or the AMC 258 i6 / 4.2l ?

 

[elwood blues]

Elwood, the Weber Carb you reference, is the application on a 304cid or the AMC 258 i6 / 4.2l ?

jonboy,

Neither engine specifically, that carburetor will work on either engine. Although a 38 DGES is probably going to be a little bit too big of a carburetor for a stock AMC 258 i6 / 4.2l , it would be very well suited for a stock AMC 304 .

 

[Old Dog]

My vote goes to the 2100, a rebuild is probally all it needs.

 

[BusaDave9]

Another option is a simple Edelbrock. They are stupid-easy to adjust and run very well. My only complaint was offroad...in stock form Edelbrock carbs just dont perform well in off camber situations.

First choice should be to rebuild the Motorcraft but if you are set on replacing it get an Edelbrock or Holley Truck Avenger. I have an Edelbrock 1406 on my AMC 304 and I love it. I installed an off-road needle kit and it runs great on rough terrain and on slopes. If you do much off-roading you should also have the floats adjusted slightly low.
The Holley Truck Avenger is another easy to work on carb. It is designed for off-road use.

 

[BusaDave9]

If you plan on keeping your MC 2100 check out this link
http://street2mud.com/webfiles/MC-2100%20set%20up%20for%20a%20258.pdf

 

[Old Dog]

IMO do NOT get a holley off raod carb. Noone I have talked to has been happy with theirs, including me.

 

[derf]

IMO do NOT get a holley off raod carb. Noone I have talked to has been happy with theirs, including me.

I had a Holley Truck Avenger on an old Grand Wagoneer years back. It worked flawlessly everywhere I took that thing. Guys with Edelbrocks were stumbling and stalling all over the place. Even the guys with the "off road kit" installed.

 

[Old Dog]

I had a Holley Truck Avenger on an old Grand Wagoneer years back. It worked flawlessly everywhere I took that thing. Guys with Edelbrocks were stumbling and stalling all over the place. Even the guys with the "off road kit" installed.

LOL you want to buy mine, I'll sell it to you.

 

[derf]

LOL you want to buy mine, I'll sell it to you.

What CFM is it? I may want it for the truck...

 

[Old Dog]

PMed ya.

 

[JR74CJ5]

Busa posted a great link for that carb. If you look at page 5 (labeled 4-3-5) the part labeled "Modulator Diaphragm Assembly" was what was wrong with mine... Pain to start and Idle and wanted to die out wen coming to a stop etc...

Agree with everyone else on the carb for now as well...

~ JR