MODEL A CARBURETORS

The information presented here was originally on a site by Jim Mason.
It is recreated here by using the Web Archive, Way Back Machine.




 The carburetors for the Ford Model A were produced by three companies.   The Zenith-Detroit Corporation, the Holley Carburetor company, and the Ford Motor company.  There are subtle differences both by year of manufacture, and by company.

Here's a copy of the Ford drawing explaining the numbering of the cabs (thanks to Vince Falter).

For a great site on the rebuilding and troubleshooting of Zenith carbs check out MODEL-A.ORG

NOTICE ALL DATES ARE APPROXIMATE
CONSULT THE 'STANDARDS' FOR MORE INFORMATION



For a larger exploded view of the Zenith carb (and other assemblies) click the link to


Piranos Antique Auto. Then click on component breakdown.

Image used with permission








CLICK ON THE IMAGE FOR A LARGER VIEW



They first table shows the Zenith-Detroit carburetors used through out production. Zenith tops can be recognized by the Z marking located below the throttle shaft. The lower bodies are marked Zenith or Zenith-1.   There are subtle differences in the dowel pins/bosses on the upper body and fittings.

ZENITH
  1927
DOUBLE VENTURI
BOSS ON BACK
1927
DOUBLE VENTURI
BOSS ON FRONT
1928
SINGLE VENTURI
DUMMY BOSS
1928
SINGLE VENTURI
BOSS REMOVED
1929
ZENITH-1
BRASS FITTINGS
1930
ZENITH-1
STEEL FITTINGS
1931
ZENITH-1
SIDE BOWL
FRONT    
BACK    






  The following table shows the Holley Carburetor Company carbs used during the Model A production.  The Holley upper body has an H or is plain below the throttle shaft. The lower body is plain or marked Zenith-2 (after 1/1/1929).  Again there are subtle differences in the fittings both by year and by manufacturer.



HOLLEY
1927
DOUBLE VENTURI
BOSS ON BACK
1928
H ON UPPER HALF
H ON LOWER HALF
1928
H ON UPPER HALF
PLAIN LOWER HALF
1928
PLAIN UPPER HALF
PLAIN LOWER HALF
1929
PLAIN UPPER HALF
ZENITH-2 LOWER HALF
RAISED LETTERS
1929
PLAIN UPPER HALF
ZENITH-2 LOWER HALF
INDENTED LETTERS
1930
PLAIN UPPER HALF
ZENITH-2 LOWER HALF
STEEL FITTINGS
1931
PLAIN UPPER HALF
ZENITH-2 LOWER HALF
SIDE BOWL
       


  The Ford motor company produced 2 carburetors for the Model A in 1931.    The upper body was either marked with a 3, or was plain.  The lower bodies were marked Zenith-3.



FORD
1931
ZENITH-3
1931
ZENITH-3
SIDE BOWL




While not in the Judging standards another Zenith carb exists. It is an early carb with a marking of ZENITH in raised letters.

The above collection of carburetors belongs to a friend of Jim Mason