TILLOTSON HS Series User Manual

5
Fuel is delivered into and through the carburetor in
the same manner as when the engine is idling.
However, as the throttle opens and the engine speed
increases, more fuel is supplied to the engine by
valving in the secondary idle discharge port located
immediately behind the throttle shutter.
As the throttle shutter continues to open and engine
Speed increases, the velocity of air through the
venturi creates a low pressure area at the venturi
throat and diminishes the suction on engine side of
the throttle shutter. When the pressure at the venturi
throat is less than that existing within main diaphragm
fuel chamber, fuel is drawn up through high speed
mixture orifice and out main fuel discharge port into
the air stream entering engine intake.
As the throttle shutter progressively opens from
intermediate position to full open position, the air
velocity through the venturi increases and fuel is
metered up through high speed mixture orifice and
main fuel discharge port in accordance with the power
requirements of the engine. The action of the main
diaphragm is the same as previously described with
suction required to operate the diaphragm being
transmitted through the main fuel discharge port.
INTERMEDIATE OPERATION
HIGH SPEED OPERATION

TILLOTSON HS Series Specifications

General

Brand	TILLOTSON
Model	HS Series
Category	Engine
Language	English