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CARBURETOR MODEL 1901
A new development in true concentric
carburetion, the Holley Carburetor Model
1901 incorporates many improvements
over the very successful earlier Holley con
centric models. New engineering features
are included to more accurately meet
all fuel requirements of the engine,
even under adverse operating conditions. These
refinements assure the increased efficiency
and outstanding performance which are
typical of all Holley automotive engine
accessories.
The most readily apparent feature
of the Carburetor Model 1901 is the elimi
nation of the air horn found on earlier
concentric models. Most of the functions of
the air horn are taken over by the
air cleaner which completely encloses the upper
half of the carburetor. Two choke
plates, one in each venturi of the carburetor
throttle body, replace the choke plate
previously located in the air horn.
HOLLEY CARBURETOR MODEL 1901
WITH AIR CLEANER
The main body is mounted above the
center of the throttle body in a manner
which allows cooling air to circulate
completely around it. This free circulation
of air helps to cool the fuel in the
float chamber, preventing percolation and hard
starting when the engine is hot. Truly
concentric airflow through the carburetor
results from this method of mounting
the main body, as the air flows vertically
downward on all sides of the main
body into each venturi. As a result of this fea
ture, the Carburetor Model 1901 has
a concentric flow of air as well as a con
centric flow of fuel.
Economical, efficient performance,
a characteristic of all Holley products, is
delivered by the Carburetor Model
1901. This manual is intended to help the carbu
retor service mechanic in maintaining
this high standard of performance. Careful
adherence to instructions contained
in this manual will result in satisfactory and
profitable carburetor service.
