Out with the 2 and in with the 1

[Anonymous]

COnsidering going back to a 1v carter yf because of gas prices and what not. Do you guys think i am going to loose any power i know i will but what i am asking is how much. Called pony carbs and they said i was an idiot for putting a holley 2300 on there to begin with because its not possible to put twice as much fuel down into one small whole. i am like well i did it and well now i want to go back to get a price on a carb. So what do you guys think should i or not. I read in a local paper that this summer gas prices are expectid to reach 4 bucks a gallon.

wes

 

[wallaka]

Technically, if you keep your foot out of it a 2-barrel will give better gas mileage. As long as it's jetted correctly, anyhow. The reason is because the primary side is so much smaller than the one-barrel.

The problem is that most people can't keep out of the secondary.

 

[Anonymous]

will i notice any power decrease

 

[JackFish]

will i notice any power decrease

Probably, but then if you're concerned about fuel economy that should not be an issue.
I think 1bbls have really good drivability, especially for daily use.
I have the valve timing advanced 4* and the car has great grunt at greens.
I'm thinking about going the other way since I just picked up a 2100 at the yard and also have a 5200 on the shelf. I am less concerned with fuel economy and want more top-end power. I agree that if you can keep your foot out of it the 5200 has a smaller primary and should be more miserly. Supposedly the best of both worlds if you can get it tuned.

 

[rickwrench]

A properly set up 1946 is tough to beat for mileage and smoothness. You won't notice much power loss below 3000rpm. Above 3000rpm you will notice.
Rick(wrench)

 

[Lazy JW]

Technically, if you keep your foot out of it a 2-barrel will give better gas mileage. As long as it's jetted correctly, anyhow. The reason is because the primary side is so much smaller than the one-barrel.

The problem is that most people can't keep out of the secondary.

I don't know much about Holley's. Is a 2300 progressive?

Those guys at Pony Carbs seem to have a bad attitude from all the reports I have read about them. I want people to smile when they take my money, not tell me how stupid I am.
Joe

 

[addo]

I could manage that, Joe. How much would you like to give me?

 

[Lazy JW]

I could manage that, Joe. How much would you like to give me?

Gotta have a better smile than that, Addo

 

[Anonymous]

The holley 2300 is not a progressive carb. The key factor here is the venturi size (= cfm) Typically most people are running a 350cfm or 500 cfm. These are not going to return great economy. Now if you get down to a 200-250 cfm, economy is possible while still having good top end. I run a 108 Autolite -2100 series- (rated at 287 cfm) for my primary carb and am impressed with it. With your setup a switch to a the smallest autolite 2 bbl (either a 98, 1.01, or 1.02 venturi) you can find would be the easiest route to take. The small 2bbl will usually return better atomization and better all around performance than a large 1bbl.

Best economy would be a small progressive 2BBL like the HW5200 series and still give you good top end but the change over will be more complicated.
Rule of thumb--the smaller the carb the more velocity thus more bottom end and the larger carb gives it back at the top end--but the thumb needs to fit the hand. Too big or too small just doesn't work well. Taxis used to have V-8's with 1 bbl carbs which gave great economy and got them around town with zip. But those taxis just didn't go down the interstates over 80mph. They would start to wheese at 3000 rpm.

 

[mraley]

I have had the same issues with Pony Carbs. They believe that anything other than a 1 barrel is wrong for our sixes. Don't listen to them. When I was running my Holley/Weber I got better milage than off my carter 1 barrel. IF I remember correctly I got about 3 miles to the gallon better.

Hope this helps...Michael

 

[robbinsj]

When I put a new Weber 32/36 on my 250, I got better performance and better mileage. IF you keep you foot out of it stoplight to stoplight. The mileage went from 17-18 around town to 20-22. Highway mileage improved only slightly. I may have gotten even better results if I had experimented with the jets but it seemed to work well straight out of the box.
-Joey