Difference between Ford A or B carburator

Hello

Can someone tell me the difference between a Ford model A Zenith and a 1932 Model B Zenith carburator.
They look the same and i must rebuild my model A carb and also have a model B carb in my garage.
Do the fit and does it mean anything to the power.
Model A engine is stock.

Thanks Hennie

 

The Model B carb has a larger throttle bore and ventura. Unless you open up your intake manifold or swap to a Model B Intake, the B Carb on your A Engine may not run any better and may not be as good because of the mis-match at the carb mounting flange. Other then that, the B will fit as far as the throttle and choke linkage is concerned. You may have to re-work the fuel line a bit because of the different inlet connection location on the B Carb.

I hope this helps,

CHRIS W.

 

Thanks Chris for the info

 

Unless I was going to open up the intake manifold or use a Model B manifold I would just use the Model A carburetor. If I remember correctly if you just bolt the Model B carburetor onto the model A manifold the angle of the carburetor will be slightly off requiring you to file the holes in the manifold or use special offset bolts (I think Bratton's has them). The main difference in appearance of the two is that the Model B has a rectangular shaped fuel bowl compared to a round one for the Model A. Look at the gasket illustrations in the vendor catalogues to see what I mean.

Charlie Stephens

 

Thanks Charlie

I think i will rebuild the stock Model A carb. I have enough other projects and
the car ran fine with it, it only started leaking maybe because of 15 to 20 years
standing and maybe because of modern unleaded chemical gasoline sh.t.

 

I have been told that they run smother and
consume less fuel with the b carb.
but you hear so much thats not true
have yet to try it my self
Im going to try a S.U carb on my model a

 

A long time ago, we built a Zenith model A carb for a guy who was racing, and had to run the original carb and intake.

Since we had no real experience at that time with hotrodding a model A; our approach was to fabricate a new venturi for the carb with model B diameter, and then fabricated all new jetting to correspond to the model B calibration.

I am sure it wasn't as good as using a model B intake and carb; but the customer claimed a top speed increase of 6 MPH, and he was happy.

Since he had no fuel mileage concerns, I have no feedback as to what this modification did to fuel economy.

Jon.

 

Thanks Jon for the info, i also have the Model B intake so i can use both or stick to the orginal setup.