I just picked a motorcraft 2100 carb the other day and I was wondering if anyone else was useing this carb it seems to be dependable all the jeep/AMC guys are switching to it

Sorry i forgot to mention the rebuild kit for this carb is only $10 and you can get performance power valves and acelerator pumps also thier are a few bifferint sizes to go with anywhare from a 190cfm all the way up to a 424cfm and anywhare in between i got one of the 287cfm carbs

I used the later 2150 version one of my vehicles. The carb is fully tuneable. I used a Holley two-stage power valve that I modified to my own specs. You can change the idle feed restriction and power valve channel restriction. The jets are different from Holley. I sometimes see new Motorcraft jets offered on ebay. Your carb should have annular booster venturis.

Mitch

Yep, Kesteb runs one of those. Scroll down for his links in this thread.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

what is the differance between the 2 and 3 stage power valve if anyone can tell me

thanks

A single stage power valve opens and provides power enrichment to the main circuit at or below a manifold vacuum equal to the power valve rating. A two stage power valve provides partial enrichment at one setting and full enrichment at a setting lower than the first. 2-stage power valves are used to increase fuel mileage by ramping fuel delivery up under power rather than giving one large increase in fuel at a given manifold vacuum.

Mitch

Mitch is 'da man, I also use a 2 stage power valve, but in my Holley 4 barrel for street use as I just need a little gas at a certain vacc. point and the rest of the enrichment only when I'm into the pedal...this is good if setting up for fair amount of fuel economy(also is helpful if you have a high weight to power ratio)...if doing drag racing(need the big picture window passages) or just aren't into the fine tuning details the single stage power valve becomes your buddy as it just comes in at X" of vacc....

-D.Idiot

Talk to me about the two stage power valve.


I'm running a 10.5 at the moment. I get pretty good economy, but still.... Not like you complain about DusterIdiot!

What are you running in the 390, and where do I get one?



CJ

sorry to be a pain but could anyone recommend a good 2 stage valve iv been looking on the holley web site and the make like 6 different ones and i don't know much about manifold vacuum

just for reference i have a 74 dart with a stock engine but i'm upgrading to a 2 bbl and split headers and i'm trying to get the best gas milage

Why are you looking on the Holley site for Motorcraft parts. Go to Ponycarbs.

You will want a 3 stage valve from a '75 Jeep with a 304. I am also useing the stock '75 Jeep jets. Some of the Jeep sites recommend that you go 2 steps leaner, and that's with mild 258's. The fuel mixture is just fine on my basically stock 225.

Make sure the carb has "1.08" stamped on the side. A smaller number is OK, a bigger number may not be. Remember Ford used these carbs on everything from 4 bangers to the 460 and the "1.08" is the venturi size in inches. That is what I am using. The "1.21" is the next lager size and are fairly common on F-150s with the 351(w/m)/352/360 engines. For adjustments settings after a rebuild, use the AMC 290/304 settings.

Also I would suggest the electric choke. The water heated version doesn't get hot enough to open the choke fully. Well, eventually it does, but it will take a long time. Also there is really no "ported" vaccum port on this carb like the BBD's. So I run my car without the vacuum advance. The Jeep guys report better results with a Transdapt adapter over the Mr Gasket one. The bottom of the Motorcraft is not the same as a Holley 2300 so they can have vaccum leaks. I made my own adapter so I didn't have that problem.

I really like the MC2100 I have on my engine. A noticable improvement over the BBD that I was running. Works great.

A warning about Ponycarbs, they are not performance oriented. They cater to the restoration/rebuild crowd. They will literally freak if you tell them you are using a 2100 on a \6. So, some creative parts ordering is required. Notice, the '75 Jeep reference, that is your friend, just tell them it is for a '75 Jeep CJ5 with a 304, and no you don't have the triangler model tag, and everything will go smoothly.

I did get the 1.08 also i found a good refrance chart for them on the web


number = cfm
.98 = 190
1.01=240
1.02=245
1.08=287
1.14=300
1.21=351
1.23=356
1.33=424

Can someone tell me what adapter I will need for the 2100 to fit on my super six manifold?

Thanks

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85' D100
225cid
A833OD

Ouch...high price to pay. It should not be too difficult to add your own ported vacuum port and tube, if you work carefully.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

I used a mr gasket #1937 but i just found out it will not work without modification so i need to get the original carb spacer for it to make it work without any major vacuum leaks (right now i have a rag jammed in the back just to get the leak minimized so i can get me back and forth to work)

ok I figured it out FINALLY if you want to use this carb with an adapter plate you need this carb





and you need to avoid this carb base




forgive me if the pictures do not come up (this is my first time uploading pictures took me long enough to figure it out)