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By '59Edsel - 10 Years Ago
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Hey everyone, I just got done doing a lot of thread searching here on the forums and got a mixed bag of results. I have a 1.12 4100 carburetor and was wondering how bad of an experience I would have putting it on my stock, worn out, original 292 engine. It's got an original 2 speed automatic trans as well. The car is currently equipped with a 1.02 2100 carb and runs like a dream. I only want to try the 4100 for giggles. Would the car be undrivable? I hear people say that it would work, just not well. I'd be expecting flat spots in the acceleration and horrible gas mileage. Is that safe to assume? Or would I not even make it out of the driveway? Just curious. Thanks
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By charliemccraney - 10 Years Ago
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While the general consensus is that it probably won't work well, something I've learned is you just can't absolutely know something until you try it. Since you have it, try it.
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By 56_Fairlane - 10 Years Ago
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I would go with why fix what isn't broken. When you start doing things like that, you'll also end up up doing a bunch of MAWs (might as well).
You really don't want to run a 1.12 jetted carb on an economy rated 292. Even a 1.08 would be pushing it. Your engine doesn't have the "lungs" to breath in all that extra fuel.
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By '59Edsel - 10 Years Ago
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charliemccraney (10/6/2014)
While the general consensus is that it probably won't work well, something I've learned is you just can't absolutely know something until you try it. Since you have it, try it.
Thank you for the confidence!
56_Fairlane (10/6/2014)
I would go with why fix what isn't broken. When you start doing things like that, you'll also end up up doing a bunch of MAWs (might as well). You really don't want to run a 1.12 jetted carb on an economy rated 292. Even a 1.08 would be pushing it. Your engine doesn't have the "lungs" to breath in all that extra fuel.
I hear that. Is there any way to "tune down" this carb to make it work better for a smaller egine?
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By Ted - 10 Years Ago
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The 1.12 carbs do vary between some of the applications. One off of a 352 would be metered differently than one from a 428. While they should all crank and run on a 292, the ones from the smaller cubed engines will perform with less drivability issues. A slightly larger pump shot may be all that’s needed to restore any drivability issues.
I use 750 cfm carbs on Y’s regularly and they work well. A recent +070 over 292 I rebuilt for a ’56 Victoria is using a 750 Summit carb and runs flawless with simply a richer jetting change on the secondary side. The primary jets are the same as delivered.
Here’s the link to an article published in the Y-Block Magazine that covered dyno testing of various carbs on an iron 4V intake. It’s not necessarily about the size of the carb but instead how that particular carb is metered.
http://www.eatonbalancing.com/blog/2012/09/25/four-barrel-carburetor-testing-on-the-y/
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By '59Edsel - 10 Years Ago
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For the record, mine is a 5752309 1.12 with the carb tag indicating:
Series: EFA
Type: 9BC
Year: N
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By 56_Fairlane - 10 Years Ago
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Looks like the carb is from a 58-60 352.
It should be a 600 cfm carb. It should work OK if you follow Ted's suggestions.
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By lovefordgalaxie - 10 Years Ago
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I'm running one in my 292, replacing a 1.08. The engine is not stock, it has a Isky E-4 cam, and is bored 0,040 over.
My carburetor was originally from a 1965 Galaxie with a 352. It works perfect, and the car runs like a dream.
I'm using 48F jets on the primary side and 55F on the secondary side.
The other day a gave a friend a ride, and he was really impressed with how well the car runs. He said he could swear it's fuel injected. No flat spots, no hesitation, starts with ease, and the secondaries kick in very smoothly. For me, the 4100 is the very best four barrel carburetor ever made.
I think it will work great, as your stock engine has more vacuum than mine due to the cam.
I would suggest using a "B" intake manifold tough, as i'm not very found of adapters.
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By lovefordgalaxie - 10 Years Ago
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By Y block Billy - 10 Years Ago
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I have run some on 292's and they did Fine. As Ted says tune it to qour engine and there should be no problem with drivability. They can also be more economical than the 2 barrel since the primarys are jetted smaller but opening the 4's a lot will make it less economical and its hard not to test them out excessively!
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By '59Edsel - 10 Years Ago
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lovefordgalaxie (10/14/2014)
Sweet! Definitely gonna try it on my 292. Thanks for posting that. I'm in the process of rebuilding right now. Can't wait!
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By lovefordgalaxie - 10 Years Ago
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'59Edsel (10/17/2014)
lovefordgalaxie (10/14/2014)
Sweet! Definitely gonna try it on my 292. Thanks for posting that. I'm in the process of rebuilding right now. Can't wait!
Don't mention it!!
Just one thing:
like your carburetor is older than mine, and I don't know what you have as booster ventury, I suggest you have a few jet sizes to play with on the primary side.
At least two sizes: 48F nd 49F.
My carburetor is basically all stock as it left the factory, the only thing I changed was the choke I converted to manual with parts from Autolite and Motorcraft 2100s.
My primary booster is marked DK as it should be for the car it was pulled out, a 1965 Galaxie with a 352. Your primary booster may be different, and that will affect the jets size that will work for you.
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By '59Edsel - 10 Years Ago
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Well, I just ordered the jets, got both 48 and 49 to experiment with. I'm going to use the Mr. Gasket 1933 adapter to test things out and make adjustments. If I like it enough I might just go out and buy a 4 barrel manifold.
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By '59Edsel - 10 Years Ago
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Well, testing Day 1…Fail Haha
I put the carb on tonight, here's how it went.
The new primaries came in the mail today (48 and 49), and I put the 48s in the carb. I didn't touch the secondary jets, they are at 62. I made sure the floats were set at the correct level, which it appeared they were. (They are original and I didn't need to adjust or replace them.) I took my old 2100 off, put the adapter on (backwards 1st time around of course, front facing rear, etc. etc.) and bolted the carb down with all new gaskets. Primed it, fired her up and all I got was this:
The engine would immediately rev up to about 2600 rpm and then rev back down and stall. Any suggestions on what has gone wrong?
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By pegleg - 10 Years Ago
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Vacuum leak?
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By '59Edsel - 10 Years Ago
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Yes, it is! I got help from many people and they all said vacuum leak as well. I removed the carb this morning. That adapter has more holes than swiss cheese. It looks like its not allowing sufficient seal of the gasket and it's leaking past those areas. So…either a much more suited adapter is in order (is there one?) or a manifold. Anyone got a B manifold that's still good?
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By charliemccraney - 10 Years Ago
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Looking at the picture of the adapter, I can't see why it wouldn't work unless it is warped or is hitting a fitting on the manifold which prevents it from seating properly. The extra holes shouldn't matter because it looks like it will seal around the perimeter.
Since the carb was rebuilt, are you sure it is back together correctly?
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By '59Edsel - 10 Years Ago
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I'm fairly certain I did the rebuild correctly. Here are a few pictures of the areas I think its leaking from:
The arrows point to where the exposed holes show gasket material that cloud easily deflect.
And here is where there is a direct path to the throttle plates:
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By charliemccraney - 10 Years Ago
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Ok, I do see how the four holes could be a problem. You could tape them shut to test and see if that is causing a leak and if they are, you can fill them with epoxy or silicone.
What you're showing in the second picture is a problem. Combined with the fact that you're using an open gasket which doesn't come close to the throttle bores and the adapter is open, I bet that is where the problem is. I'm not able to find any other style of adapter with a brief search. Since it is just a mismatch between the adapter and carb, you could try a thin 4-hole spacer to go between the adapter and carb. That should ensure a good seal. I don't know if the problem shown in picture two is really a problem if a four hole spacer is used, which will seal the throttle bores. The spacers I see don't look like they would match that carb in the area shown in picture 2.
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By lovefordgalaxie - 10 Years Ago
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Before I got the intake manifold (that I bough from a fellow forum member, and took some time to get here) I used the Mr. Gasket adapter. Massive vacuum leaks...
A friend of mine has a company that lazer cuts sheets of metal. I asked him for a "metal gasket" made from 1mm thick aluminum, and he did it.
Then, I used two gaskets, one under and one over the aluminum plate, and problem solved.
Like Charlie said, you can also get a 1/4" phenolic spacer, and it will do the same job as mine aluminum "gasket". You will need one to use with the B intake anyway.
Bought my spacer from Mac's
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