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Unread 03-10-2009, 11:34 PM   #16
CJ258
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1974 CJ5 
 
Join Date: Sep 2008
Location: El Centro, CA
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I replaced the original head, intake and exhaust on my '74 with '87 YJ parts. The Rochester 2 barrel is the same size opening as the adaptor for the 2100 but still had to make my own adaptor plate and ported it to match the intake with the Rochester. The 2100 plate bolt hole overlapped the carb bolt holes.

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Unread 03-11-2009, 10:34 AM   #17
MikeMCJ
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Quote:
Originally Posted by CJ258 View Post
I replaced the original head, intake and exhaust on my '74 with '87 YJ parts. The Rochester 2 barrel is the same size opening as the adaptor for the 2100 but still had to make my own adaptor plate and ported it to match the intake with the Rochester. The 2100 plate bolt hole overlapped the carb bolt holes.

thanks for answering.
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Unread 03-11-2009, 04:47 PM   #18
jeepdaddy2000
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Quote:
Originally Posted by 00bluedak View Post
Rochester 2 jet is the way to go!!! they are easy to find and dirt simple to work on. they are jetted a little rich for a 6 though since they came on v8's, but you can get new jets to easily fix that problem.
There are two sizes. One is 298CFM, the other I believe is 400. The larger is common on V8's while the smaller on V6's. My 225 came from the factory with the smaller version and it worked extremely well offroad.
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Unread 03-11-2009, 08:40 PM   #19
SuB8HaVeN
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Are you running the 1bbl or 2bbl intake manifold? My all-around favorite would have to be a Holley 2300 for simplicity, downright reliability, and easy tunability. I run the progressive Weber 34/34 on my CJ and it gets much better fuel economy than any other 2bbl, and still has some umph. IMO, the Holley is simpler and easier to tune than the Weber. The Weber 32/36, and Holley 5200 (basically a Weber 32/36 clone manufactured by Holley) are also both great carburetors and are very fuel efficient, being progressive 2bbls.

My CJ sees a lot of on-road driving, so fuel economy is pretty important to me. That's why I run a progressive Weber on there. If I was more into tuning it and getting the most performance I'd have a Holley 2300 on there.
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Unread 03-12-2009, 01:43 AM   #20
CJ258
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The smaller version is also the 2 5/8" neck and one I'm using has the 3 1/16" neck.
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Unread 03-12-2009, 09:43 AM   #21
neals80
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Hands down the MC2100....smooth smooth smooth
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Unread 03-12-2009, 04:12 PM   #22
HackFabrication
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Here's mine:


Edit: Oops... This happens when you just read the title, and not the whole post....
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Unread 03-12-2009, 05:12 PM   #23
scottymac62
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MC 2100's. I have them on my CJ7 (258) and my CJ5 (304).
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Unread 03-13-2009, 10:28 PM   #24
mcmud
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Gotta Winner Here

Quote:
Originally Posted by HackFabrication View Post
Here's mine:


Edit: Oops... This happens when you just read the title, and not the whole post....
I'd say ALL TIME BEST EVER!
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Unread 03-16-2009, 10:17 PM   #25
gimmesomerocks
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^^ i prefer an over/under double barrel^^

anyhow, i was out @ the junkyard over the weekend and spotted an '81 Mustang with the 4 banger. I have some pics for you all to ponder over and tell me what you think. I really like the fact that it has a mechanical secondary and not vacuum. There is not much I know about these carbs, just that they were supposably weber carbs, marketed as holley, and I know nothing more. No idea how to id these weber carbs. I could not find an id tag on it anywhere, but I did not grab it or mess around too much with it as I was already on my way out with another cast iron anchor (this time a two barrel and from a fsj.) so, if anyone can look @ the pics and say yea, or can tell me how to better narrow down the model of the carb. unfortunately these are the only two pics I have and they were also taken with a smell fone. (wife won't let me take the dig. cam to the junkyard)



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Unread 03-16-2009, 11:05 PM   #26
mcmud
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Best pass on that 6520 I'd say. Missing the Power Valve Control Valve and Diaphragm. Lower right corner in first photo, and cause it has had a Power Valve Control Valve. It's a feedback carb looking for O2 sensor input. Look further for a 5200. It will not have that missing thing nor the E.A.V. Solenoid directly across the fuel horn on cover.

This photo, compliments of another JF user is what to seek. The Holley5200
one.jpg  
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