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Old 06-02-2019, 04:48 PM   #1
wellcraft17
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Default Holley 2100, on 292

Could someone tell me what size jets should be in a Holley 2100 on a stock 292.
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Old 06-02-2019, 05:39 PM   #2
scicala
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Default Re: Holley 2100, on 292

According to my old Holley parts and service manual, the main jets on the 2100 3 bolt two barrel carbs varied depending on which year engine and carb. '52 thru '53 EAB 2100 carbs used a 51 main jet. '54 EBU 2100 Y Block 239's used a 55 main jet. '55 ECG-5 2100 carbs used a 57 0r 59 main jet, and '56 ECG-6 2100 carbs used a 52 main jet. This is all for sea level to 5000 feet above sea level.


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Old 06-02-2019, 05:43 PM   #3
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Default Re: Holley 2100, on 292

Unless you are talking about the Autolite 2100 two barrel used from '57 on up. In that case they also varied from year to year. More than likely those sizes would be in the 50's as far as the main jets. If you can tell me the carb number stamped on the base of the carb (left front ear) or on the metal tag, I have an Autolite manual with that info for certain years.


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Old 06-02-2019, 06:18 PM   #4
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Default Re: Holley 2100, on 292

Thanks for the information, it’s a 56 motor with a Holley 1,1/16 carb and It currently has #53 jets in it. The engine runs good just thinking maybe changing the jets might enhance the performance of the engine.
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Old 06-02-2019, 10:52 PM   #5
Daves55Sedan
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Default Re: Holley 2100, on 292

The carb with the 1-1/16" venturi's is a Holley 2110 and it was only used in 1956. The Holley 2100 was popular in '55 as well as the Ford EBU carb, both having 1" venturi's. I am running a 292 in a '55 with a Ford EBU carb and it has #55 jets, but have also used other EBU's and a Holley 2100 having either #51 or #55 jets. Never had problems running the highways as long as intake vacuum and ignition system are up to snuff.
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Old 06-03-2019, 08:05 AM   #6
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Default Re: Holley 2100, on 292

Thanks for the information, I’ll just keep the #53s in it as it runs and idles good.
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Old 06-03-2019, 01:42 PM   #7
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Default Re: Holley 2100, on 292

Yes, I agree. Keep the 53's in it. Even if you found a more ideal main jet size (if there even is one), you would never notice the difference in the seat of the pants.


Also, the EBU carb was for '54 239 Y-Blocks with a 1" venturi's. The 1955 ECG-5 carb had 1 1/16" venturi's . The '56 ECG-6 carb had 1 1/6" venturi's also, but had larger throttle bores making it the highest air following of these carbs on Ford passenger cars.


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Old 06-04-2019, 12:22 AM   #8
Daves55Sedan
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Default Re: Holley 2100, on 292

Quote:
Originally Posted by scicala View Post
Also, the EBU carb was for '54 239 Y-Blocks with a 1" venturi's. The 1955 ECG-5 carb had 1 1/16" venturi's . The '56 ECG-6 carb had 1 1/6" venturi's also, but had larger throttle bores making it the highest air following of these carbs on Ford passenger cars. Sal

You are correct, the 2100 does have 1-1/16" venturi's, but it has the same air-horn and valve body as the EBU. The '56 Holley 2110 had a larger air horn, including the provisions for the automatic choke and larger bores in the valve body.
All three carbs (EBU, 2100 and 2110) have exact same mounting bolt-hole pattern, but the EBU and 2100 can use either '54 or '55 oil-bath air cleaner, while the '56 air cleaner will not fit on the '54 & '55 and vice-versa.
Yes the EBU was used on the '54 239 Y-block, but many '55 272's also had the EBU (possibly only early in the model year). My '55 came with an EBU when I bought in in 1972 and the car still had the original Power-Punch battery. It was pretty obvious the previous owner had never done anything to the car but change tires.
Back in the early '70's, I used to go to a junkyard about 25 miles from here that had three rows of '55 & '56 Fords. More than half the ones I looked at had Ford EBU carbs. All of the ones they had were 272's. There were no 223 I-block 6-cyls in the bunch. Back in the '90's, I went back there again and they were all gone.
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Old 06-04-2019, 11:37 AM   #9
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Default Re: Holley 2100, on 292

Yes, it doesn't surprise me that they used up the EBU carbs in early '55, but they sure gipped the customers on a couple HP because the ECG-5 flowed more air. Probably never notice the difference though.


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