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  #1  
Old 05-09-2014, 08:34 AM
jcook5003 jcook5003 is offline
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Best NEW Bolt On 258 Carb

Hey guys-

I'm about to drop my 258 into my J10 frame. The only thing I don't have is a carb.

I'm looking for the best out of the box carb I can get for this thing. I'm not interested in rebuilding a 2100 and having to fiddle with the jetting.

Any advice on the carb and a best place to purchase would be greatly appreciated.

Thanks
Josh
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  #2  
Old 05-09-2014, 08:55 AM
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babywag babywag is offline
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Weber or Holley are your only NEW options AFAIK.
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  #3  
Old 05-09-2014, 09:35 AM
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jsinajeep jsinajeep is offline
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even out of the box new you will still need to adjust it to run right.
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  #4  
Old 05-09-2014, 09:35 AM
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serehill serehill is offline
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Hmm

I really like My weber but the Holley do rock. the Holley would be simpler & cheaper.
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  #5  
Old 05-09-2014, 09:55 AM
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TexTJ209 TexTJ209 is offline
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There's a guy on eBay that sells 2100/2150s already jetted and set up for Jeep applications. I've got one on my CJ-7 that works great.
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  #6  
Old 05-09-2014, 10:27 AM
joe joe is offline
 
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IMHO the best all around use carb is the Weber 32/36. Not cheap at all but great carbs. You'll need an adapter and new throttle cable. The Webers I've had were all great carbs and most were brand new(so expensive). Never had to mess with jetting changes for a 258, but with any carb you'll have to tune it for your motor. The 2100's are good simple carbs if you get a good one rebuilt correctly. Preferably one you rebuilt yourself. Very easy to do. I've also a Holley 2v on an AMC258 that I previously ran on an inline six LandCruiser. Don't know the model number but think it was called an Economaster or some such? There are some good online rebuilt carb suppliers that do their own rebuilds in-house. I STRONGLY suggest you DO NOT buy a rebuilt/remanufactured carb from any of the chain auto parts stores. Those are all pretty much outsourced Mexican Dip-n-Shine rebuilds and odds of getting a good one is about one in three. If ya just gotta buy a chain store carb spring for the extra money and buy new not rebuilt.
In any case new/used/rebuilt whatever you choose you will have to tune it. Lotsa good 2v carbs out there if in good condition and set up correctly. Actually the old stock BBD's(sans computer circuit nonsense) are pretty decent carbs when in excellent condition...for awhile anyway. Dedicated carb shops are getting pretty rare but if you have one in your area they're worth talking to about buying a rebuilt. Carbs seem more mystifying than most really are. If you can "follow directions" most 2v's(the 2100 is one of'em) are silly simple to rebuild doan be afraid of doing it yourself. DO BE AFRAID of chain store rebuilts! When shopping don't get caught up CFM ratings and assume bigger is better.
Most common screw up a lot of folks make with carb swaps is buying more carb than their motor can handle and never get'em running right for street use.. A low rpm 258 tractor motor don't need a lot of carb.
I vote Weber or 2100. The Weber is a pretty complicated 2v if you have to go internal and trying max performance across the range but the ones that are sold for 258 Jeep swaps by vendors like Cliffords are brand new so you've got a fighting chance. I don't recommend Cliffords though. I've dealt with then and they can be real arseholes to deal with that don't know as much about what they're selling as they think they do.
If you decide to buy a new Weber I'd avoid Cliffords expect maybe for the manifold adapter or throttle cable and go with an aftermarket vendor that sells them for Brit MGB etc swaps. Same carb same specs. I've swapped Weber 32/36's between 258's an 4 cyl MGB's with no mods other than tuning.
Bottom line from all the above drivel. Don't buy a chain store rebuilt period and don't be afraid of rebuilding what you already have.
G'luck.
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Last edited by joe : 05-09-2014 at 10:31 AM.
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  #7  
Old 05-09-2014, 11:43 AM
jcook5003 jcook5003 is offline
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Ok well if I'm going to look at MC2100's which one do I need?

What's the guys name on EBay? Are they reliable rebuilds?
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  #8  
Old 05-09-2014, 11:50 AM
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babywag babywag is offline
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The 1.08 venturi MC2100 w/ 48? jets worked well on a cam'd '79 258.
Don't recall the actual jet size that we ended up using.
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  #9  
Old 05-09-2014, 12:27 PM
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DanHS DanHS is offline
 
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These are the two big sellers on Ebay I think
http://www.ebay.com/usr/ehrmannmp
http://www.ebay.com/usr/ridgerun31

This is the carb my friend bought for his '88 Wrangler (258), his Jeep ran great with the carb set just the way it came out of the box, I think he only needed to do some minimal tuning. He bought it from this seller on Ebay.
http://www.ebay.com/itm/JEEP-GENUINE...-/151247481616
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  #10  
Old 05-10-2014, 01:24 PM
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Tinkerjeep Tinkerjeep is offline
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Just to stir the pot...why not go with a GM type TBI from Howell?
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  #11  
Old 05-12-2014, 08:13 AM
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TexTJ209 TexTJ209 is offline
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Quote:
Originally Posted by DanHS
These are the two big sellers on Ebay I think
http://www.ebay.com/usr/ehrmannmp
http://www.ebay.com/usr/ridgerun31

This is the carb my friend bought for his '88 Wrangler (258), his Jeep ran great with the carb set just the way it came out of the box, I think he only needed to do some minimal tuning. He bought it from this seller on Ebay.
http://www.ebay.com/itm/JEEP-GENUINE...-/151247481616



I bought mine from ehrmannmp.
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  #12  
Old 05-12-2014, 12:02 PM
mokurt mokurt is offline
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A lot of money but I went with a HESCO MOPAR MPI.No stalling on hills,no flooding,runs great.
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  #13  
Old 05-12-2014, 08:39 PM
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jpcoutts jpcoutts is offline
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I really like the idea of fuel injection but wanted to stay stock on my CJ7. I bought a rebuilt from an outfit called Guaranteed Carburetors in Largo, FL and it has been a very good experience, $178 bolted it on right out of the box and it was even set up to run with few adjustments. I'll order from them again.
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  #14  
Old 05-12-2014, 09:00 PM
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Tinkerjeep Tinkerjeep is offline
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I guess I'll lend my 2 pennies, but I had this on a 360, a bit different.

I got the 360 powered 1976 Wagoneer out of a field with my dad. he replaced a few things, and we swapped out the gas (and later the tank) nd it ran...didn't drive well though, smoked like a boxing promoter and was loud as cannon fire. Scared the neighbors great.

It had a Holley 2-barrel on it. I don't remember much about it, but I ended up having to replace the 2-barrel throttle body with a 4-barrel unit and crimping the fuel feed tube to the rear fuel bowl closed. It ran that way for a few months and then it would just stop running. We parked it and it got parted out as my 4-door truck's cab. But the Holley crb impressed me with its versatility...even if the tendancy to strip out screws is pretty likely if you have to rebuild these a lot.

Might be worth a look if they make one that will work with a 258.

Some guys here swear by Holleys.
I swear at Holleys.

But maybe I'm just too hamfisted for a sofistimukated mekanikul device as a Holley Carb.

Last edited by Tinkerjeep : 05-12-2014 at 09:07 PM.
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  #15  
Old 05-12-2014, 11:29 PM
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Carnuck Carnuck is offline
 
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Holley = Hole in wallet.
Motorcraft are considerably better.

I lay odds that '76 had the gold box Presto-no-lite ignition that cut out. The only vehicle ignition system in the world that I know of where the factory "fix" for ignition cut out is to cut the dist connector off and solder the wires together!
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  #16  
Old 05-13-2014, 12:04 PM
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Tinkerjeep Tinkerjeep is offline
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Quote:
Originally Posted by Carnuck
Holley = Hole in wallet.
Motorcraft are considerably better.

I lay odds that '76 had the gold box Presto-no-lite ignition that cut out. The only vehicle ignition system in the world that I know of where the factory "fix" for ignition cut out is to cut the dist connector off and solder the wires together!

Holley does require a lot of tuning in harsh climates if they are old. I'll say that. All mine were, and I tossed them into the dumpster like the 15 pound boat anchors they were.

It should have had the Presto!...but the PO swapped a Delco points system into it. I found the dying issue. It wouldn't pump fuel to the carb, it was all going to the return line....I have the very exact freaking fuel pump on my 4-door and it hums along fine. Must have been a bad ground or plugged lines, I think I changed the filter on the 76 Wag twice...but maybe not. It died for a good cause though.
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