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Old 06-19-2014, 11:49 AM   #1
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Timing and Carb Jets

What should the timing be set to after the MC 2150 and the nutter? I could use the help. I bought my MC 2100 from a guy on Ebay that sells a bunch to Jeepers but he Jetted it for Colorado I guess. I have to run it full manual all the time. He said it was a 48 jet I`m not sure what it should be jetted to in Indiana. I will be happy to rejet it if I knew what to change them to. Any ideas?? Thanks

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Old 06-19-2014, 04:06 PM   #2
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What should the timing be set to after the MC 2150 and the nutter? I could use the help. I bought my MC 2100 from a guy on Ebay that sells a bunch to Jeepers but he Jetted it for Colorado I guess. I have to run it full manual all the time. He said it was a 48 jet I`m not sure what it should be jetted to in Indiana. I will be happy to rejet it if I knew what to change them to. Any ideas?? Thanks
We need more info, what other mods to the engine, and your elevation?

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Old 06-19-2014, 04:34 PM   #3
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If you have to run Full Choke {is that what you mean by "full manual"} then you way have a bad vacuum leak or something not caped off.

I would think if it is just jetted too lean, it would cough under a load, like first starting off.
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Old 06-22-2014, 09:50 PM   #4
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Angry elevation

Sorry was out of town. My elevation is 300 feet. I have done the Nutter By pass, MC 2100/2150 it has a 78` 4.2L with 60,000 miles on it. new fuel pump, rebuilt dizzy, I have the GM HEI to change but want to get it running right first. wit the set up I have now what should the timing be set at. this is not my DD right but might end up that way. I have been messing with this for about 10 months every chance I have. ( I am raising a 6 year old son also so limited time.) I looked for Vacuum leaks but could not find anything. If I could find anyone close that would help I would compensate them. Just trying to get it lined out. getting to whits end. what other info can I offer? Thanks for all the help. Yes I did mean running full choke it runs good.
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Old 06-22-2014, 10:14 PM   #5
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I am in northwest indiana, have a 79 cj with the 4.2, running a 2150 with 47 jets, electric choke. Switched to a DUI hei last yea, running pretty good right now. How is the carb mounted to the intake? Are you using a thick gasket? I had to use permatex aviation gasket goo on mine to eliminate the vacuum leaks at the base.
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Old 06-22-2014, 10:18 PM   #6
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I went with a thick gasket from an 82 ford van if I remember correctly.
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Old 06-22-2014, 10:26 PM   #7
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Gasket

Thx, I will pick up one tomorrow and try that. I have went thru a full can of carb cleaner looking for leaks but for a few bucks a gasket is worth a try. I will also use the permatex aviation gasket goo. I have a tube of that.
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Old 06-22-2014, 10:35 PM   #8
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Ya i got my 2150 from ebay gronk a couple weeks ago. Im in denton tx @ 700 ft elev. I have 48.5 jets in mine. Everything went on smooth with no leaks. It runs awesome. Got my crt perf hei in a box in my living room...be in later this week.

Get you a can of carb cleaner or starting fluid and spray around the base of carb. If it smooths up or changes idle / running....well there is your lear area.
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Old 06-22-2014, 10:41 PM   #9
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Curt68

I have gone thru a full can but cant get to the back very well, So I am going to change the gasket tomorrow after work. Do you know what the timing should be on the 4.2 with the Nutter?
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Old 06-22-2014, 10:42 PM   #10
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Also make sure you are still hooking up your distributor vacuum advance to a ported source.
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Old 06-23-2014, 12:02 AM   #11
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Mine run best @ 9 deg. BTDC , I'm told 9 +/- 2, thats at 700rpms with vacuum line off and plugged.
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Old 06-23-2014, 12:25 AM   #12
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Quote:
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I have gone thru a full can but cant get to the back very well, So I am going to change the gasket tomorrow after work. Do you know what the timing should be on the 4.2 with the Nutter?
Mine is at 10* before tdc. With my weber 38 and hei.
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Old 06-23-2014, 06:16 PM   #13
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Good info

Viking, Does the thick gasket go between the adapter plate and the carb or between the intake and adapter? Thanks for the timing info.
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Old 06-23-2014, 08:54 PM   #14
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I put the gasket that came with the adapter plate on the intake and the thick gasket between the adapter and carb
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Old 06-24-2014, 06:00 PM   #15
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Viking

Thanks a lot for the help. Heading out to swap the gaskets out.
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Old 06-25-2014, 06:03 PM   #16
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Whooo Whooo!!!

Well great news, The gasket took care of the problem. Thank you guys!!! It runs better than it ever has. Good power, No choke. Just need a need a new muffler and I am good for now.
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Old 06-26-2014, 12:43 AM   #17
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timing

Quote:
Originally Posted by Harmbl View Post
I have gone thru a full can but cant get to the back very well, So I am going to change the gasket tomorrow after work. Do you know what the timing should be on the 4.2 with the Nutter?
i dunno for sure man sorry. with my cam i think i read mine should be around 12 degrees. my 4.2L is long a thing of the past.

listen to c5wagner man....he convinced me to do the 2150 conversion. from our conversations....he is the man when it comes to the 2150
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Old 06-26-2014, 12:50 AM   #18
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choke

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Well great news, The gasket took care of the problem. Thank you guys!!! It runs better than it ever has. Good power, No choke. Just need a need a new muffler and I am good for now.
i put the factory carter electric choke on mine. just unscrew it, reverse the spring direction and put cover back on. mine works great
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Old 06-26-2014, 02:54 AM   #19
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i dunno for sure man sorry. with my cam i think i read mine should be around 12 degrees. my 4.2L is long a thing of the past.

listen to c5wagner man....he convinced me to do the 2150 conversion. from our conversations....he is the man when it comes to the 2150
I dont think I really gave any advice on this thread. I asked the stats on the build but never followed up because th op didn't post near when I was on again and I'm usually on this forum once every 2-3 days to check private messages.

It's not like i needed to convince you really, I'd consider the 21xx series carbs to be the best corporate 2 barrels made. Carter carbs on a jeep were an awful idea from the start considering that all the other 4.2l smog equipment was motorcraft already from the duraspark to the main ecm, and that amc used the motorcraft carbs on their 304's stock. It wasnt even just jeeps that received crappy late carter carburetors. Even the carter thermoquad on many v8 dodges wasn't meant to stand the test of time with their resin bodies and the easily frozen butterflies.

Sorry for my rant, I just really hate carters and dont even get me started on edelbrock haha
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Old 06-27-2014, 10:13 AM   #20
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Great, glad it worked out
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Old 06-27-2014, 01:04 PM   #21
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Quote:
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i put the factory carter electric choke on mine. just unscrew it, reverse the spring direction and put cover back on. mine works great
I run one from a 78 or 79? CJ7 before the computers and it does great, and is a bolt on and put the stock air cleaner back and drive off, 15 mins. and I do use the one with the stock Elec.Choke. There great IMO!

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