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Unread 03-28-2010, 06:53 PM   #1
Forumpete58
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Got the MC2100 installed BUT

Got the MC2100 installed today, BIG thanks to Beachedjeepyj, he was a big help and I really appreciate him taking time out of his weekend to help me! Here's my question...We got the carb installed and I can tell a good difference over the carter but mostly in the top end. I still feel I'm missing a lot of low end power in my CJ. I'm planning on doing the TeamRush upgrade this week, I'm really hoping this helps. Another problem is that I may still have a vacuum leak. Beachedjeep tested the vacuum pressure and the needle was jumping quite a bit between 15 & 20lbs. Problem is that we thought we got all the vacuum lines hooked up or blocked off.

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Unread 03-28-2010, 07:13 PM   #2
Trapshooter
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The vacuum leak is most likely you low end problem. You need to resolve the leak issue before you do anything else. Lets think about this for a second...vacuum is what advances the timing.

Good luck..........
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Unread 03-28-2010, 07:44 PM   #3
Olrev
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Yep, find your vac leak first. If you don't know the propane trick, learn it. Propane trick - Jeep Wrangler Forum. Once you get that nailed, you will want to start playing with the accelerator pump, trying each of the "holes" (test driving). Usually, you can find a setting that will cure the low end issues. If that doesn't do it, you can try some different jets...bigger and smaller. I've ended up with 51's in mine, which is big/rich for most daily drivers but it works great in my application. I did the TeamRush and added the lighter springs to my distributor and I'm amazed at how much grunt I get. As long as you don't have anything bigger than the 1.08 you should be able to get it to idle smooth as butter and it should climb trees below 500rpms. I'm actually gonna try a 1.02 and see if I can milk some more low end out of mine.
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Unread 03-28-2010, 07:59 PM   #4
Forumpete58
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I snapped some pictures of how its set up. Maybe you guys can shed some light on this.
Thanks!




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Unread 03-28-2010, 08:17 PM   #5
Olrev
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Hard to tell much from the pics...vac leaks are hard to see. Try spraying carb cleaner around to find your leak. Honestly, I think you will find your problem in your ac. pump adjustment.
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Unread 03-28-2010, 08:20 PM   #6
Forumpete58
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Quote:
Originally Posted by Olrev View Post
Hard to tell much from the pics...vac leaks are hard to see. Try spraying carb cleaner around to find your leak. Honestly, I think you will find your problem in your ac. pump adjustment.
Stupid question but "ac. pump adjustment"?
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Unread 03-28-2010, 08:28 PM   #7
Trapshooter
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Accelerator pump........is my guess.
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Unread 03-28-2010, 08:39 PM   #8
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Quote:
Originally Posted by Olrev View Post
Yep, find your vac leak first. If you don't know the propane trick, learn it. Propane trick - Jeep Wrangler Forum...
I did this for the first time after installing my MC2100. Crank her up, and using a hand-held cylinder, open the valve and move it around any place that might be questionable. The idea is that the leak will pick up the propane and your engine will smooth out. Get a cylinder at the local hardware store, ~$4. Don't forget to get the nozzle. They are generally sold separate.
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Unread 03-28-2010, 08:39 PM   #9
Forumpete58
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Accelerator pump........is my guess.
Ohh ok thanks, I bought my carb as a set off ebay and was under the impression that they came pre-tuned.
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Unread 03-28-2010, 08:42 PM   #10
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I actually JUST bought one of those small propane tank/torch sets. I'll see if I can determine anything tomorrow.
Thanks!
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Unread 03-28-2010, 08:51 PM   #11
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One other thing that could help. I went throught this with my MC2100... I installed it with the Mr. Gasket adapter plate. Using the propane, I discovered significant leaks around the base of the carb. After I pulled the carb back off, I discovered that the MG plate was much smaller than the carb base, and I had used only the gaskets that came with the adapter. You have to use the larger gasket designed for the 2100 on top of the adapter. Otherwise, you'll never eliminate the vacuum leaks. It was explained to me by another JF member. Hope it helps you.
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Unread 03-28-2010, 09:02 PM   #12
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^^^ What he said! The thin gasket between the carb and adapter is useless. There is a thick one you can get at any parts store for about $4. I bet if you spray brake cleaner around the base of your carb you will find the leak.
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Unread 03-29-2010, 09:04 PM   #13
Olrev
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The gasket you're looking for is a felpro #60716...it's actually called a "phenolic spacer".

The Accelerator pump (sorry for the abbreviation earlier) adjustment is critical and if you're gonna run a 2100 you're gonna have to learn how to tune it. You will see a rod on the drivers side of the carb (or the side that your linkage hooks up/opposite side of the choke). That rod actuates the accelerator pump in the front of the carb. It should connect to your linkage on a small bar with 4 holes in it. Which hole you put the rod into determines the fuel delivery amount during early acceleration. Usually the second or third hole works the best but you will want to try each and test drive it.
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