Carb Swap Question

[orngjp]

70 CJ5 258

Swapped in a Motorcraft 2100 carb last week.... runs great. Only problem was the carb was off a 1971 Ford Truck and didn't have a port for PVC. For now i am using the vacuum port that i think was originally used to provide heat to the choke coil to assist in heating it up??? Not sure of this, but it is a tube that has full vacuum at idle and lead into chamber near the choke coil.... seems to work for now.

Anyone know if this is going to be a problem or have any other ideas??

Thanks for any thoughts.

 

[bcrowe]

I have a YJ with a 258 and the Carter carb and want to do a swap for the 2100 as well. I've heard great stories about the swap and am glad to hear another positive comment about it! Good luck finding your answer, you'll get a lot of good advice in here!

 

[pdparker]

Have you heard of a HOLLEY #8007 390 CFM 4-BBL. CARBURETOR conversion kit? It comes with the intake manifold and a 4bbl carb that is supposed to replace the Carter BBD. I have been thinking about making the leap, but am hesitant. Know anyone who has made the conversion from 2bbl to 4bbl? What are the pitfalls?

 

[orngjp]

don't know anyone personally who has made the conversion to the holley 4, but i would think that would work best on an engine that has been modified to increase hp.
motorcraft swap has been great so far.... better idle and definitely a big improvement off road on inclines.

 

[Redi85CJ7]

Anyone do the Moorcraft or Holley swap for a Carter where they have to smog the vehicle?

 

[Brosch]

I just today swapped my BBd for a MotoCraft 2150. What an improvement! I got the carb off an '80s F150 for thirty bucks. I got the proper rebuild kit from the first parts house I passed for $15. An adapter (from Mr. Gasket PN 1937) cost $15. A blind monkey could rebuild one of these things and various jets are available from... everybody. I'll need to putter with the fuel/air trim to get it tuned for emmisions testing, but what the hell, for 60 bucks I have a CJ that actually is a gas to drive. Just make sure you select a carb that has a PCV spot and ports for all that other stuff.
One surprise; The electric choke from the Carter apparently turns opposite from the choke on the MC, so I'll need to find one with the coil going the other way, or I wonder if the coil could be flipped....?
My advice; Don't be intimidated, chuck that Carter POS and bolt on something (anything) else.

 

[lah2420]

Have you heard of a HOLLEY #8007 390 CFM 4-BBL. CARBURETOR conversion kit? It comes with the intake manifold and a 4bbl carb that is supposed to replace the Carter BBD. I have been thinking about making the leap, but am hesitant. Know anyone who has made the conversion from 2bbl to 4bbl? What are the pitfalls?

A friend of mine ran a 4bbl on his CJ for a few years. I don't know what CFM his was. His has a cam, headers, and dual exhaust. He is going to install the 2100 in it's place. Even with his mods, it is too much carb for the motor. I just put the 2100 on mine. I don't know about fuel mileage yet, but starting, power, and throttle response are much better than the Weber I had on it.

 

[Brosch]

I did the MC 2100 swap on my '84 CJ and I highly recommend it.
I hope this helps;
The adapter is available from Mr. Gasket. The part number is 1937.
Jets are easily available and all the jet part numbers start with 120-4-??
If you look at your jet and it says 46 on it, the part number would be 120-4-46 and the orifice size would be .046"
If, with these jets, your carb seems to be running rich, you could order a pair of 120-4-44 and try that for a while. (Reduce the size at least two sizes or you may not even be aware of a change.) The cost of a pair of jets is about 7 bucks.
A Neihoff kit for the 2100 should be about $15 but it dosn't come with jets. It does come with a power valve and unless you taking this 2100 off something radical, like a BB Ford or somethig, it should work okay.
Once you bracket the proper size jets and the best power valve, share the intel my brother.
For parts go to;
http://www.swapsupply.biz/
This guy has it ALL!

 

[jimmyl]

http://www.cjoffroad.com/

best forum for this type of swap

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