2 Barrel: Holley 2300 or Autolite 2100

[Tinker]

2 Barrel: Holley 2300 or Autolite/motorcraft 2100

Does anyone have any info on these to carbs. CFM 500 or 350? Which one might be better? Why? Available new? Rebuild kits? etc?

Thanks

[tdlmomowers]

We keep the rebuild kits in stock at the Napa store where I work. Get me some carb. numbers and I will see if I can get you some kit part numbers.

[Tinker]

Thank you but, I see that holley sells a new 2300 with a manual choke. The carb i have now has enough issues to just replace it. Pieces missing. Wonder if the new stuff is e10 ready.

[streetdreams]

2100 carbs come in various CFM ratings depending on venturi size stated on side of float bowl ( LF of carb). There are small versions from 260 V8's up to monsters from 429 2V engines. All are easily rebuilt with available kits.

[scrapiron]

Flat top Ford 2barrel CFM by venturi size --
.98=190
1.01=240
1.02=245
1.08=287
1.14=300
1.21=351
1.23=356
1.33=424
from a HAMB posting some time ago

[Tinker]

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This is for a stock 292. I believe the cfm is around 490 for a good stock 292. The Holley 2300 I have found are either 350cfm or 500cfm. I'm leaning to the 350cfm, but will that be starving the engine? I think the 500cfms will be to much. Looking for reliability and efficiency.

[LOWRIDER]

350cfm should work fine. 56 Ford 272 ran a Holley 94 carb w/about a 160 cfms. People tend to over do it picking carbs thinking if 500 cfms is good 650 will be much better. Your better off picking one with a bit lower cfm rating as opposed to the max the engine might tolerate. Personally I would choose the 2100. Simple carb to rebuild & tune but finding one w/a manual choke might be a bit difficult. But you could always convert the heat tube/automatic choke to an all electric choke cap. Just did that to my 4100 (4V), works fine.

[Tinker]

I'm thinking about one like this... Will it bolt up? Linkage should be simple I believe.

http://www.jegs.com/i/Holley/510/0-7...oductId=743827

[ems customer service]

i use a holley 500cfm 2 bbl on my 351w works great not to big, not to small

[streetdreams]

X2 on what Lowrider has said. '59 - '62 Fords and Mercs with 292 engines came from Ford with a 2100 2 bbl on them. Find one, rebuild it and drive on.

[darrell]

the one your looking at will fit and work.

[Ole Don]

I agree with Darrell above. It will fit, and it will run. I think that is way to much to spend on a carb that is so simple to repair and a stock Ford carb may get better fuel mileage. With a modern repair kit, it should be fine with E10 gasoline.

[scrapiron]

FWIW....I run a 1.01 @ 240 cfm on a 292 in an F600 on a 1 1/2 risor block. Try to squeeze some mileage out of it, get about 11 mpg, 7000+#. good torque ,,,

[Tinker]

What does fwiw mean? Edit... Ah I googled it. For what its worth.

Don i've just had holley 94s and stroms97 before. So i thought that was an okay price on a brand new carb. The 2100 i have is missing parts and the butterfly shaft is sloppy. Ill have to keep an eye out at swap meets for a buildable 2100 or for the parts i need.

Thanks for the help everyone.

[TerryJomt]

Hi Scrap Iron: On the cfm chart referring to Venturi size does that mean measured at the throttle bore at the butterfly's or at the narrow restriction in the middle ? :-) TJomt

[streetdreams]

The narrow restrictions in the middle are called venturis. The CFM rating is measured at the baseplate with the throttles open full.

[Blue Futura]

Originally Posted by Tinker

I'm thinking about one like this... Will it bolt up? Linkage should be simple I believe.

http://www.jegs.com/i/Holley/510/0-7...oductId=743827

My son bought that very same carb. from Jegs about 15 years ago for his 292-Y block . It worked well for a few years then sat unused a bunch more years . It needs rebuilt now so i guess i need to learn a little about Holleys . We just made a new linkage rod for it and the hand choke worked real smooth.

I see they cost close to $100.00 more now than they did then , oh well everything else does too.






.

[scicala]

Originally Posted by scrapiron

Flat top Ford 2barrel CFM by venturi size --
.98=190
1.01=240
1.02=245
1.08=287
1.14=300
1.21=351
1.23=356
1.33=424
from a HAMB posting some time ago

One thing to consider on Holley CFM ratings is how they flow rate their carburetors. They flow the 2 bbls at 3.0" Hg (manifold vacuum at wide open throttle), and they flow rate the 4 bbl. carbs at 2.0" Hg at wide open throttle. So the 2 bbls flow a higher CFM rating from Holley. Don't know why they do this other than to make the 2 bbls look like they are more than what they actually are.

Bottom line: A 350 CFM rated Holley 2 bbl. flows significantly less than you think. If a 4 bbl Holley had the same size venturi's and throttle bores as the 350 CFM 2 bbl., it would flow more like 550 to 600 CFM and not 700 CFM like you would think, because it is flowed at a lower manifold vacuum at WOT. I know this can get confusing, but it is based on fact from people I know that worked in Holley's engineering lab years ago. I also have many years of carburetor engineering and flow box experience, so not just talking out of my rear end.

Sal Cicala