What carb came stock on a 1979 cj5 with the 304? - Pirate4x4.Com : 4x4 and Off-Road Forum
 
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Old 11-20-2011, 06:53 PM   #1 (permalink)
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What carb came stock on a 1979 cj5 with the 304?

I did a search and all I came up with was power upgrades and such.

Like the title states, assuming its the stock 2 barrel carb, what is it? I thought I read it should be a mc2100?

Thanks guys.

Just bought the Jeep, and trying to figure out what parts it has.
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Old 11-20-2011, 07:25 PM   #2 (permalink)
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Yep, Motorcraft 2100 with the 1.08" Venturi diameter. That's what came with my 76 304 from the factory.
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Old 11-20-2011, 07:29 PM   #3 (permalink)
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Thats what I was thinking. Thanks for the info.
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Old 11-21-2011, 07:09 AM   #4 (permalink)
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A good upgrade carb would be one from a later model ('81+ IIRC) Grand Wagoneer 5.9l, the Model 2150, which comes with an altitude compensating Aneroid on the back of it. If you live in or wheel in the higher altitudes, it will run better. Bolts right on to the stock manifold and the throttle linkages are the same. You may need to add a vacuum line to the power valve housing under the carb, depending on whether or not the original 2100 has the internal or external vacuum source for the valve. The other vacuum ports are the same.

Here's a link to a picture of one:
http://www.i-5automotive.com/images/upload/42.jpg
The Aneroid is the silver canister on the rear, with the brass adjusting screw. It leans out the mixture as the air pressure drops.
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Old 11-21-2011, 06:06 PM   #5 (permalink)
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I live at 5500' so yeah, might be worth looking into, thanks.
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Old 11-21-2011, 08:47 PM   #6 (permalink)
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Marty Socal:

How would that carb function if you went from around 3500 ft to 9000ft...does in compensate for large changes like that?....I have a 304( in a 72' commando) with a new edelbrock carb someone installed, should I look at pulling it for one of these waggy carbs?

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Old 11-24-2011, 08:44 AM   #7 (permalink)
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It will compensate better in altitude than any carb without the aneroid. One of my friends had one on his Wagoneer, it worked pretty well up in Big bear, which is 6500 to 8000 feet, depending on the trail. I'm not sure what the max altitude compensation rating is on it, however.

If you live at 3500 ft, you could rejet the carb leaner based on that altitude, then the compensator would work even better at higher altitude.

The Aneroid works by opening a bypass orifice at the back of the carb to lean out the mixture. The aneroid has a sealed bellows in it that moves with the change in air pressure. There is an adjuster on it, but I haven't ever played with the adjustment.

The factory revised the ignition base timing specs for high altitude Jeeps, the timing spec is 4 degrees higher than the low altitude models. Bumping up the timing helps alot, too.
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Old 11-24-2011, 03:00 PM   #8 (permalink)
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Cool..Thanks for the info...Should I take the new edelbrock off and ditch it for one of these Waggy carbs? This carb will be for an offroad only rig, no street driving, so I am just looking at off camber and elevation change considerations...

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Old 11-25-2011, 06:29 AM   #9 (permalink)
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Does anyone know if the 2150's came in anything other than the 1.21 venturi size? I adapted a 2100 with a 1.08 venturi on my 258 and it ran great, but always wanted to try a 2150 just because of the altitude compensator. Never could find any that weren't 1.21's. I'm wondering how efficient the fuel atomization will be with the 1.21 on a 304. A friend had a 1.21 2150 on his 360 CJ7 and loved it.
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Old 11-25-2011, 08:58 AM   #10 (permalink)
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Federal spec '81 CJ 304's may have had the 2150, could be the 1.08 bore?
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