The Ford Barn

Gene F · 11-23-2024, 06:34 PM

Ya know, on a more modern car (like something from the 70s) I was always taught that the air fuel mixture screws do zero when the car is running down the road.

After adding that O-ring, I wonder how much turning of that screw it takes to maximize the idle performance. Pretty interesting.

I see the gross-jet that would be controlled by the float. I have heard that you need to pull that in favor of the traditional needle and seat if you want maximum performance with a B carb on the top-end.

rich40701 · 11-25-2024, 07:15 PM

I run a B carburetor and it idles great and I think Renner's had me add the O-ring. David also machined the carburetor to allow for the use of an air-filter. Lol When I bought the air filter I did not realize I had a B-carburetor instead of an A so the air filter housing had to be machined to fit the B carb. I had the carburetor apart several times before I got it right but now it purrs like a Model A.

Lawrie · 11-25-2024, 09:42 PM

Gene, thanks for that info on the grose jet, I will replace it.
Lawrie

Synchro909 · 11-26-2024, 07:35 PM

Quote:

Originally Posted by Gene F

Ya know, on a more modern car (like something from the 70s) I was always taught that the air fuel mixture screws do zero when the car is running down the road.

After adding that O-ring, I wonder how much turning of that screw it takes to maximize the idle performance. Pretty interesting.

I see the gross-jet that would be controlled by the float. I have heard that you need to pull that in favor of the traditional needle and seat if you want maximum performance with a B carb on the top-end.

Is there a source for those valves? Snyders only have the Viton tipped ones.

Jim/GA · 11-26-2024, 07:59 PM

Quote:

Originally Posted by Gene F

I see the gross-jet that would be controlled by the float. I have heard that you need to pull that in favor of the traditional needle and seat if you want maximum performance with a B carb on the top-end.

I have never had a problem with fuel flow through the gross-jet ball style float valves. Mine can keep up with fuel demand just fine.

Where did you get this caution?

Gene F · 11-26-2024, 09:12 PM

Sponsored Links (Register now to hide all advertisements)

The ones at Snyders are the ones.

I got that info on here.

11-23-2024, 06:34 PM	#21
Gene F Senior Member Join Date: Mar 2012 Location: Ohio Posts: 2,476	Re: B carb Ya know, on a more modern car (like something from the 70s) I was always taught that the air fuel mixture screws do zero when the car is running down the road. After adding that O-ring, I wonder how much turning of that screw it takes to maximize the idle performance. Pretty interesting. I see the gross-jet that would be controlled by the float. I have heard that you need to pull that in favor of the traditional needle and seat if you want maximum performance with a B carb on the top-end.

11-25-2024, 07:15 PM	#22
rich40701 Senior Member Join Date: Mar 2022 Location: Corbin, KY Posts: 112	Re: B carb I run a B carburetor and it idles great and I think Renner's had me add the O-ring. David also machined the carburetor to allow for the use of an air-filter. Lol When I bought the air filter I did not realize I had a B-carburetor instead of an A so the air filter housing had to be machined to fit the B carb. I had the carburetor apart several times before I got it right but now it purrs like a Model A.

11-25-2024, 09:42 PM	#23
Lawrie Senior Member Join Date: May 2010 Location: Qld, Australia Posts: 4,529	Re: B carb Gene, thanks for that info on the grose jet, I will replace it. Lawrie Last edited by Lawrie; 11-26-2024 at 01:19 AM. Reason: spelling

11-26-2024, 09:12 PM	#26
Gene F Senior Member Join Date: Mar 2012 Location: Ohio Posts: 2,476	Re: B carb Sponsored Links (Register now to hide all advertisements) The ones at Snyders are the ones. I got that info on here.