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Page Title:
BACK SUCTION ECONOMIZER SYSTEM - continued |
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 Through regulations of the air pressure
delivered to the engine at this
in the fuel bowl chamber the fuel flow
particular throttle opening. Opening
through carburetor can be controlled
throttle valve (6) further exposes the
entire economizer orifice (24) to
to provide proper mixture proportions
manifold suction, which results in
for the engine.
additional air being removed from the
fuel bowl chamber (9), again leaning
All the air that enters the fuel bowl
chamber (9) must first pass through the
out the mixture ratio to the correct
air cleaner and the bowl vent (22).
proportions for this new throttle
The size of the bowl vent (22) controls
position.
After the economizer orifice
(24) is fully exposed to manifold
or limits the amount of air that can
enter the fuel bowl chamber (9). The
suction the amount of air that is drawn
out of the fuel bowl chamber (9) is
amount of air that is drawn out of the
controlled by the manifold vacuum or
fuel bowl chamber (9) is controlled by
suction at any given throttle valve (6)
the size of the economizer jet (23),
position and as this suction decreases
the economizer orifice (24) and the
as the throttle approaches wide open
position of the throttle valve (6) as
position, less air is drawn out of the
its position determines the manifold
fuel bowl chamber and additional fuel
vacuum or suction on the economizer
flows to engine to provide the extra
orifice (24). As the throttle valve
richness required for operation at
(6) is opened from the fast idle
heavy loads where maximum horsepower is
position the economizer orifice (24)
necessary.
is gradually exposed to manifold
suction, and air flows from the fuel
The "Back Suction Economizer System"
bowl chamber (9), through economizer
assures the proper metering of fuel to
jet (23) and out the economizer orifice
the engine throughout the service life
(24). This air must be replaced by air
o f c a r b u r e t o r a s t h e r e a r e n o moving
entering through the bowl vent (22) but
parts to wear out or adjustments to get
as the size of the bowl vent (22)
out of order. It is essential, how-
restricts the amount of air that can
ever, that the system remain free of
enter, the resultant pressure in the
dirt and foreign matter because any
fuel bowl chamber (9) will be lowered,
foreign substance in the system will
reducing the difference in air pressure
restrict the flow of air thereby
between the nozzle (14) and the fuel
creating improper pressures in the fuel
bowl chamber (9). The flow of fuel
bowl chamber and resulting in improper
will therefore be retarded so that the
fuel delivery to the engine.
exact economy mixture ratio will be
1-16
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