1930 Cadillac Brochure Front Cover - GM Heritage Center

is cleaned twice in its passage between the gasoline tank and the
carburetor by two straining devices, once before entering the
vacuum tank and again after leaving it. The second fuel strainer is
of a visible type which may be readily opened for cleansing, and
eliminates all water as well as solid particles.
CARBURETOR
Cadillac engineers have designed the carburetor as an integral
part of the power plant and have not, as in many cases, considered
it as an accessory. It is designed to meet every requirement of
the Cadillac V-type, eight-cylinder engine. It is of the air valve
single jet type, but with a number of exclusive features. The fuel
level is maintained by a cork float hinged at one side of the bowl
and encircling the spray nozzle. This design has a marked advantage
in that change in the
fuel level, brought about
through changes of car
position when ascending
and descending grades,
is greatly minimized. This
insures a more uniform
mixture and renders the
carburetor less subject to
the motion of the car.
The Cadillac carburetor, with automatic
throttle, concentric float chamber, and
thermostatic control, successfully meets
every requirement of perfect carburetion
for the Cadillac V-type engine.
The carburetor is provided
with three thermostats
which render seasonal
adjustment of the
The crankcase surfaces upon which the cylinder
blocks are fastened must be absolutely
(rue. This giant milling machine squares
tlte surfaces to form a perfect seal
for the cylinder blocks
carburetor unnecessary. The auxiliary
air supply by which the
correct mixture is automatically
maintained at all speeds and
throttle openings is controlled by
a leather-seated swing valve governed
by an adjustable spring.
One of the three thermostats controls
the action of this valve. A
richer mixture, for accelerating, is provided by a throttle pump at
one side of the carburetor. It is a simple plunger pump operated
directly from the throttle shaft, furnishing extra fuel in the spray
nozzle when the accelerator is depressed rapidly. The second thermostat
regulates the action of this pump to compensate for changes
in temperature. The third thermostat, acting at unusually high temperature,
opens a vent to permit the escape of gas pressure from
the float bowl which might be generated in very hot weather with
"high test" gasoline. An automatic throttle is provided to prevent
surging and fluttering of the air valve when accelerating.
EXHAUST-HEATED INTAKE HEADER
The carburetor is located between the cylinder blocks connected
to the two short intake manifolds by an exhaust-heated
intake header. The intake header is provided with passages con-