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Old 12-30-2007, 12:45 PM   #1 (permalink)
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Carburetor decisions

So I need an intake/carb for a 4.2 engine I am building what would be my best/cheapest combo for light rock crawling. With exception of the crappy carters
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Old 12-30-2007, 01:10 PM   #2 (permalink)
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A Holley Off Road Carb or Low Rider Carb.
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Old 12-30-2007, 06:54 PM   #3 (permalink)
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No contest

No contest. MC2100

Use the stock intake, get the adapter (~$20), and run a MC2100

Webers suck ass.
The Holley Truck Avenger is okay, but not better than the MC2100 (and is $$$).
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Old 12-31-2007, 07:35 AM   #4 (permalink)
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Quote:
Originally Posted by atblis View Post
No contest. MC2100

Use the stock intake, get the adapter (~$20), and run a MC2100

Webers suck ass.
The Holley Truck Avenger is okay, but not better than the MC2100 (and is $$$).
I found one on ebay for $140 and will also sell me the intake for another $20. good deal?
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Old 12-31-2007, 09:08 AM   #5 (permalink)
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Not really

I would say no, but it kinda depends.

Around me, I just go to the JY and snag one for $20, get a rebuild kit for another $15. You'll probably have to order a power valve, that's $10. Jets also, IIRC you'll end up paying about $20 shipped for a pair.
20 +
15 +
10 +
20 +
_____
$65

The MC2100 is extremely easy to rebuild. I just use carburetor cleaner and a toothbrush.

Now, if that carb off ebay comes with the correct jets, and the correct powervalve and is a fresh rebuild, than that doesn't sound too bad.

If by the intake you mean the adpater, you can order that anywhere for about $20
Mr Gasket 1937
Transdapt TRD-2086

I am about to do a TBI swap. If that goes well, I'll have some MC2100s for sale. The TBI swap is something you might want to look into.
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Old 12-31-2007, 10:57 AM   #6 (permalink)
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Quote:
Originally Posted by atblis View Post
I would say no, but it kinda depends.

Around me, I just go to the JY and snag one for $20, get a rebuild kit for another $15. You'll probably have to order a power valve, that's $10. Jets also, IIRC you'll end up paying about $20 shipped for a pair.
20 +
15 +
10 +
20 +
_____
$65

The MC2100 is extremely easy to rebuild. I just use carburetor cleaner and a toothbrush.

Now, if that carb off ebay comes with the correct jets, and the correct powervalve and is a fresh rebuild, than that doesn't sound too bad.

If by the intake you mean the adpater, you can order that anywhere for about $20
Mr Gasket 1937
Transdapt TRD-2086

I am about to do a TBI swap. If that goes well, I'll have some MC2100s for sale. The TBI swap is something you might want to look into.
adapter is included with the carb I offered him 20 for the intake too(I need it all) 6 months since rebuild, throttle adapter, and this is coming off of a 258
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Old 12-31-2007, 11:29 AM   #7 (permalink)
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Yeah

Ask him what size carb it is, what jets, and what powervalve. Don't tell him what you're looking for, just ask what it has. If he doesn't know the answers immediately off the top of his head, than most likely it doesn't have those things.

Jets should be 46s or 47s 46s are about perfect for a stock 258 at sea level
Powervalve should be somewhere between 8.5-10.5
Carb should be a 1.08

I was consistantly getting 21mpg with a stock 258, 3 speed and 33x12.50s running a 1.08 with 46s and a 9.5 PV (55 mph though).

If it is has an electric or manual choke that's a little bit of a bonus.

So if everything is in good working order, it has the correct jets/pv and is a 1.08, that isn't a horrible deal. You're paying a little for convenience, but...
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Old 12-31-2007, 07:16 PM   #8 (permalink)
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What is the doner vehicle the MC2100 comes off of in the junk yard?

I just bought a Scrambler, 83, with the carter carb on it and I want to upgrade.

Also, what makes the TBI better than carb? Since it's not pumping gas right into the intake ports like a MPI? Is a TBI worth the upgrade? What are the benefits? Jeeping up or down Inclines?


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Old 12-31-2007, 09:17 PM   #9 (permalink)
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Some links

Yahoo or Google
search for "MC2100 258 swap" or something similar

http://www.cjoffroad.com/writeup.asp?WU_ID=16&noAdd=1
http://www.geocities.com/reddjeep88@...mc2100swap.htm
etc. etc.

Ford Vehicles usually 70s
Jeep Vehicles with V8s

TBI is fuel injection. It utilizes an oxygen sensor. Additionally, it does away with the fuel bowl and thus flooding when at extreme angles. Fires right up and idles when cold. etc. etc.

The MC2100 does surprisingly well for a carburetor (probably the best off road carb actually).
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Old 01-02-2008, 05:37 AM   #10 (permalink)
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I passed on that ebay auction I think i'd rather buy the parts separately. Thanks for all of the useful info.

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Old 01-02-2008, 05:47 AM   #11 (permalink)
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MC2100 or im my case i use a modified Carter. Ive had mine running with the vehicle on its side before and with the exception of near vertical climbs i rarely have an issue (a high idle hookup works for that tho)

Good Luck
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Old 01-02-2008, 09:15 AM   #12 (permalink)
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Old 01-02-2008, 11:12 AM   #13 (permalink)
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The mr gasket adapter and gaskets look like a better quality product than TRD 2086 although through all the searching the TRD- 2086 is always listed. I have read that some people have had issues with the gaskets sealing anyone have any input on this.

MR. gasket 1937
http://store.summitracing.com/partde...view=32&N=700+

TRD-2086
http://store.summitracing.com/partde...view=32&N=700+
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Old 01-02-2008, 12:04 PM   #14 (permalink)
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Yeah

I have the MR Gasket 1937. It works fine, just use good quality gaskets and don't over tighten it.

A aircraft gasket sealant would probably help. Make sure it's okay for gasoline.
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Old 01-02-2008, 03:06 PM   #15 (permalink)
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Has anyone had any luck with a Holley Pro-Jection? T
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Old 01-02-2008, 04:41 PM   #16 (permalink)
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Atblis are the gaskets supplied with the Mr. Gasket 1937 kit adequate? I noticed that the Mr. Gaskets gasket was an UPGRADE option for the TRD-2086 kit.
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Old 01-02-2008, 06:41 PM   #17 (permalink)
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You know

I can't remember, but am pretty sure they were. What you don't want are the really thin plain paper ones that you're likely to get at Adv or AZ. You want something that is somewhat thick and pliable.

In general it is getting really hard to get good quality parts for carbed vehicles. They don't give you the right parts anymore when you go to the store. Make sure you use things that are gasoline resistant. Gasoline will turn many things into jelly in short order.

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Old 01-02-2008, 07:13 PM   #18 (permalink)
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Forget the difficulty in getting gaskets... I can't find a junkyard around here that has carbed vehicles in it.... I guess I'll need to go to Ebay to get the MC2100?
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Old 01-30-2008, 06:01 AM   #19 (permalink)
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or you can post in jeep wanted ads



I have all the parts and the carb is being rebuilt according to the specs provided thanks guys can't wait to get it on
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