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Carter YFA cfm, considering 2100 instead?

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Jesse73
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Posts: 7
Joined: Thu Feb 28, 2019 7:13 pm

Carter YFA cfm, considering 2100 instead?

Post #1 by Jesse73 » Wed Mar 13, 2019 4:09 pm

Hey folks,

I have made a post a little while ago about finding a replacement for my battered stock Carter YFA carb, but now I'm having second thoughts. I'm looking for some advice on maybe going for a 2100 carb instead.

This spring I am hoping to go for a few bolt ons while I am taking care of some maintainence. I am considering adding a duraspark distributor, switching the rockers to chev versions, and replacing my exhaust manifold with an EFI variant before replacing the rest of the exhaust in the truck.

Am I going to be running out of carburation with some of these mods aimed at better effieciency? I have found several references to the Carter YFA being about a 170 cfm carb. I wonder if I should go a little bigger when I replace my carb instead of finding a stock replacement. My only experience with this comes from adding a long tube header to my willys jeep, and it ran out of fuel and required more to run correctly with better exhaust flow. Not the same situation I understand but it made me wonder if I will have the same problem with this truck.


This is for a '73 F100 with a 240.

Thanks!

old28racer
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Posts: 473
Joined: Wed Apr 12, 2017 3:27 pm
Location: Camarillo, CA

Re: Carter YFA cfm, considering 2100 instead?

Post #2 by old28racer » Wed Mar 13, 2019 5:24 pm

I am currently running a Holley 2v 300 cfm on a hogged out 1 barrel log intake with a 2v adapter on my stock 300 motor in my 1971 F250, only add on are set split 6 headers & 2 1/2" dual exhaust system. I am switching to EFI exhaust manifolds later this year & going to replace the 2v 300cfm Holley with a Autolite 2100 or 2150 1.08 287 cfm 2v. The normal operation the 300 Holley is a gas hog and a bear to tune. The 2100 / 2150 is much easier to rebuild and tune. It makes a great every day cruising carb on a 300 inline 6.

As I understand the stock YFA carb is 195 cfm so in general you should get a 38% gain in cfm with the 2100 / 2150 Autolite. Good luck with your mods. :nod:
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Bad Day Racing Is Better Than A Day In The Stands :mrgreen:

Jesse73
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Posts: 7
Joined: Thu Feb 28, 2019 7:13 pm

Re: Carter YFA cfm, considering 2100 instead?

Post #3 by Jesse73 » Fri Mar 15, 2019 1:07 am

Cool thanks for the reply, good to know about the Holley carb. I am just thinking why spend the money on a carb twice if I am trying to build up the engine a little?

old28racer
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Posts: 473
Joined: Wed Apr 12, 2017 3:27 pm
Location: Camarillo, CA

Re: Carter YFA cfm, considering 2100 instead?

Post #4 by old28racer » Fri Mar 15, 2019 2:43 pm

I think you would be a lot happier with a aftermarket 4V Clifford or Offy C with the 4x2 adapter so you can run a 2100 or 2150. Then if you build the motor up later you can drop a 500 - 650 4 barrel on the intake and sell the 2100 / 2150.

Don't get me wrong the Holley 350 is a good carb and the one on my truck 300 4.9L runs great. It just uses a bit more gas. If you have tuned a lot of Holley 4 barrel you would have no problem, but for me & my driving I like the 2100 / 2150 much better.

Do keep in mind that the EFI exhaust manifold & full dual exhaust will give you the most bang for your buck and it sounds great.
Bad Day Racing Is Better Than A Day In The Stands :mrgreen:

Jesse73
Registered User
Posts: 7
Joined: Thu Feb 28, 2019 7:13 pm

Re: Carter YFA cfm, considering 2100 instead?

Post #5 by Jesse73 » Fri Mar 22, 2019 10:40 am

Anyone have any good luck with the reproduction 2100 carbs? I see they are $84 on Amazon.com. I guess I would be willing to give one a try if it lasted a few years. The downside is that I would have to find another air cleaner setup. I would like the factory stock style with the stove pipe etc. The upside to that is the fact that my current 1 barrel air cleaner is shot, hole is worn through the bottom and patched. So I really need a new one anyways.

My current budget/plans will be EFI exhaust and a 2 barrel carb, and see where that gets me. Then move on to engine work later.

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