Modified Zenith Carburetor

[1931 flamingo]

JoeWay: Thanks for the link. I knew the A manifold could be opened up for the B carb and that the attaching needed to rotate a bit. Is the "new" carbs venturi area going to be as big as a B or larger??
Paul in CT

 

[1928Pickuppain]

i would buy one i like the idea off a little more powere

 

[BRENT in 10-uh-C]

What is being done to manifold?? Will it externally look original? Exhaust hook up as original?? Could and original manifold be "opened" up to match new venturi size??
Paul in CT

As Joe said, many of us have been boring (or drilling as David is doing) the 'A' manifolds. Originally the Model B was 1.250" and I do mine at about 1.300" on the draw tube.

This project is something that I have been comptemplating for several years now as I would like to install the proper looking manifold and carburetor. Joe, to answer your question about using a good running carburetor, while that is a possibility, remember that the bowl will need to have machine work, and the jets will need to be re-flowed because with more air comes the need for additional fuel. The only thing that I tend to think would be different than Mike's S&S carb that he installed on his Harley is that with a modified 'A' carb, we would still be able to use the GAV to lean out the fuel mixture to increase the fuel mileage. Granted horsepower will suffer with less fuel but it does kinda allow one to have their cake and get to eat it too.

 

[modela-carb]

JoeWay: Thanks for the link. I knew the A manifold could be opened up for the B carb and that the attaching needed to rotate a bit. Is the "new" carbs venturi area going to be as big as a B or larger??
Paul in CT

Paul, at this point, we're thinking same size as the B. There's a limit to how much metal can be removed safely and until we get further into the project we don't know what the final dimension will be.