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  #1  
Old 10-11-2010, 09:58 AM
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2 barrel intake, 4 barrel carb pros/cons

I learned this weekend that I have a 2 barrel intake with a 4 barrel carb and an adapter in between. Like the title says, what are the pros and cons of this setup?
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Old 10-11-2010, 10:05 AM
Ristow Ristow is offline
 
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lousy airflow resulting in poor atomization retention,and poor velocity through the venturiis,poor economy.

no pros. it's a bad setup.
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Old 10-11-2010, 10:06 AM
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Quote:
Originally Posted by Ristow
...

no pros. it's a bad setup.

Yep. Only reason to do it would be if you had no other carburetor.
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Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination ATs, 7600 GVWR
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Old 10-11-2010, 10:08 AM
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So I guess I should find a decent 2 barrel carb? I understand the AMC 327 4 barrel intake is pretty hard to find....
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  #5  
Old 10-11-2010, 10:15 AM
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Also any suggestions on a replacement carb?

My plan was to rebuild the Edelbrock that was on it, but since I have it off and it's a less than desireable setup it doesn't make much sense to put it back on there
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Old 10-11-2010, 10:19 AM
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lemme know if you wanna sell your 4bbl carb.

dunno how hard it is to find parts for the 327, i'm a 360 and 258 guy.
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  #7  
Old 10-11-2010, 05:40 PM
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Yoy could go with the Holly 2300 500cfm two barrel. That is almost as much cfm as a small four barrel, and if you have the stock cam a 500 deuce is all you need anyway. With the stock cam your engine will not suck in enough mixture to make a four barrel worthwhile, not on an AMC 327. I know there were four barrel versions of that motor, my 59 Ambassador had one, but lots of luck trying to find a four barrel intake now.
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  #8  
Old 10-11-2010, 05:43 PM
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Quote:
Originally Posted by Great Pharoah
Yoy could go with the Holly 2300 500cfm two barrel. That is almost as much cfm as a small four barrel, and if you have the stock cam a 500 deuce is all you need anyway. With the stock cam your engine will not suck in enough mixture to make a four barrel worthwhile, not on an AMC 327. I know there were four barrel versions of that motor, my 59 Ambassador had one, but lots of luck trying to find a four barrel intake now.

This is a GREAT carb. Might even be a bit too much for a stock low-revving 327, don't know too much about those engines.
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  #9  
Old 10-12-2010, 09:50 AM
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Quote:
Yoy could go with the Holly 2300 500cfm two barrel.

I was actually looking at this carb on the Summit Racing website. I don't know much about carburetors as I've never owned a carbureted vehicle prior to my Jtruck. How do I go about matching the right carb to my motor? I also saw the same carb in a 350cfm flavor...How will the 500 vs 350 translate to engine performance?
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  #10  
Old 10-12-2010, 10:25 AM
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I'm not a big fan of the 2300 for off-road use. IME they are great on the street, but are terrible on steep hills or broken terrain. They flood out and stall, or simply won't run at certain angles. They can be set up to work ok (with adding several accessory parts), but you'd be better off with a carburetor that already runs well on the trail.

They also get lousy mileage.

Re the 500 v. the 350, the 500 will be better at WOT (wide open throttle), but the 350 will give you better fuel control at low speed and potentially better economy. But I would not buy either of them for this application.

If you can't find the original carburetor, I suggest you get a Motorcraft 2100 or 2150. It has the same base pattern as the Holley, and will work for any application that the Holley will. The 21xx is simple, reliable, and excellent on the trail.
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Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination ATs, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D

Last edited by tgreese : 10-12-2010 at 10:29 AM.
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  #11  
Old 10-12-2010, 02:31 PM
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I've only found Holley and Rochester carbs for stock replacements. Is the Motorcraft considered an aftermarket piece? What vehicle can I find the Motorcraft on?

Thanks for all the suggestions by the way. The assistance is greatly appreciated
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  #12  
Old 10-12-2010, 03:07 PM
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You would have to buy a remanufactured Motorcraft; they aren't being made anymore.

This guy on eBay sells a lot of them. He has a great reputation too. http://cgi.ebay.com/ebaymotors/MotorCraft-2100-JEEP-Carb-Upgrade-258-4-2-Non-Smog-1-08-/320602480035?pt=Motors_Car_Truck_Parts_Accessories &hash=item4aa5659da3

You could send him an email and see if he'll work with you.

The only other sources are from a junkyard, or a carburetor rebuilder.

Jeep used them with CJs, Commandos and FSJs for many years - maybe someone here has a used one that you could rebuild. They were also used on many thousands of small-block Fords in the '70s.
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Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination ATs, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D
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Old 10-12-2010, 03:11 PM
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My comments are directed toward Q-jet swapping, but I am not anti-adapter-usage; though I am in a minority.

http://www.ifsja.org/forums/vb/showthread.php?t=84718
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  #14  
Old 10-13-2010, 09:54 AM
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I have a lot of 327 parts including the stock carb with a rebuild a year ago. Let me know if your interested. And as far as off-roading I've never had a problem with it and iv gone up hills steeper than id care to do again. It's great imo
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  #15  
Old 10-13-2010, 09:58 AM
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Quote:
Originally Posted by 68_Gladiator
I have a lot of 327 parts including the stock carb with a rebuild a year ago. Let me know if your interested. And as far as off-roading I've never had a problem with it and iv gone up hills steeper than id care to do again. It's great imo

That would be your best choice, IMO.

The aftermarket 2300 is set up for flat track racing ... center pivot float, low bowl vents, no slosh baffles, etc. etc. The factory carb /should/ be an entirely different story.
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Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination ATs, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D
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  #16  
Old 10-13-2010, 10:44 AM
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Quote:
I have a lot of 327 parts including the stock carb with a rebuild a year ago. Let me know if your interested.

PM sent. Thanks for all the feed back and support! Lord knows I would be lost without the folks on this site
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  #17  
Old 10-13-2010, 11:36 AM
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I will second Tim's remarks about the Holley 2300. I had one on one of my CJs and it was absolutely horrible off road.

It would flood terribly on any kind of incline or bumpy area. I tried all of the fixes...spring loaded needles and seats....baffles etc. Nothing worked.

What did actually work for the inclines was spinning the carb around 180 degrees and mounting it backwards. With the bowl on the rear of the carb the fuel couldn't slosh in going up hill. Going down hill was another story though...however it's easier to keep it going in a flooding condition while traveling down hill;->

It did work fine on the street. But that rig hasn't seen the street in a number of years now

Anyway I went to a Holley Projection TBI and have never looked back. I've flopped that Jeep a few times since and have to remember to turn the motor off

I have a Holley Truck Avenger on another CJ that works great off road...that won't help you though as they only make em with 4 barrels.
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Last edited by seventynine : 10-13-2010 at 11:40 AM.
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Old 10-13-2010, 11:49 AM
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fuel injection would be nice, but I don't think there is a conversion for the AMC 327 is there?
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Old 10-13-2010, 12:04 PM
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Hmmm...well I'm not sure exactly but the universal Holley Projection which I used (I think the part number is 502-20s) is a two barrel throttle body. It's designed to work with a 4 barrel manifold though. You might check with Holley about the efficiency of running it with a two barrel manifold. I'm assuming it's possible to set up that way but might not be worth your while.
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Old 10-13-2010, 01:44 PM
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A Ford CFI throttle body plops right on in place of the 2V Holley. You could use that with the MegaSquirt and have fuel injection. Or use the Chevy throttle body with an adapter.

It can be done, but it would require some reading and learning and effort.
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Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination ATs, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D
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