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DESCRIPTION
1. DESIGN
The Holley Carburetor Model 1901 is
a dual
concentric downdraft carburetor. This
dual carbu
retor can be considered as two carburetors
built
side by side into one unit. Each side
has a sepa
rate venturi, throttle plate and choke
plate, idle
system, and main metering system.
The carbu
retor Model 1901 is of a true concentric
con
struction, for all major units and
systems are
built around a common center. Concentric
con
struction insures efficient operation
under the
most severe operating conditions,
such as driving
over steep grades and rounding curves
at high
speed. Under these conditions, proper
metering
is assured because of the location
of the main jets
and power valve in the center and
bottom of the
HOLLEY CARBURETOR MODEL 1901-FF FOR
1952 STANDARD TRANSMISSION MERCURY
L-1 -51
HOLLEY CARBURETOR MODEL 1901-FFG WITH
GOVERNOR FOR 1952 FORD F-7 AND F-8
TRUCK
float chamber, which is itself centrally
located.
Fully sealed within the air cleaner,
the carburetor
uses only filtered air. This gives
added protection
against plugging of passages and air
bleeds with
dirt.
Difficulties of hot starting are virtually
eli
minated because of the position of
the main body.
Mounting the main body in a manner
which sus
pends it above the throttle body allows
cool air
entering through the air cleaner to
circulate freely
around and under the fuel bowl.
Added fuel required for acceleration
is sup
plied by the throttle operated accelerating
pump.
An "over-ride" feature of
the accelerating pump
allows a prolonged discharge of fuel
for smoother
acceleration. The accelerating pump
linkage is
adjustable to allow a varying amount
of discharge
to compensate for climatic changes.
A fully automatic power enrichment
system
actuated by manifold vacuum delivers
the added
supply of fuel necessary for high
speed or full
power operation.
On passenger cars, a thermostatically
con
trolled automatic choke is used with
this carbu
retor to assure instant starting
in all weather.
