3-27
FUEL SYSTEM
3-27
MODEL
4160
CARBURETOR SYSTEMS
(Continued)
As secondary throttles
open, increased
Diaphragm spring
Diaphragm
vacuum in secondary
Secondary
Increased vacuum in
holds secondary
check
venturi adds to that
venturi
primary venturi moves
throttle plates
from primary venturi
diaphragm to open
Secondary closed
to give a stronger
secondary
throttle
signal to diaphragm
Primary
venturi
pickup
throttle
throttle
plate
plate
LOWSPEED/LIGHT LOAD
HIGH SPEED/HEAVY
LOAD
SECONDARY FUEL METERING SYSTEM
The 4160 model secondary metering body
(plate) is enclosed within the fuel bowl. The
metering body is attached to the carburetor body
with six clutch head screws.
Fixed main metering restrictions are located in
the bottom of the metering body. Fuel for the idle
and idle transfer system as well as fuel for the
main metering system enters the main well
through these restrictions. Idle fuel wells branch
off of each main well. Fuel travels up the idle
well through an idle restriction where it is mixed
with air entering through the secondary idle air
bleeds. Air enters the main well through the sec-
ondary high speed air bleeds.
The air and fuel emulsion is discharged out of
the secondary nozzles located in the booster
venturi. The secondary transfer and main meter-
ing system are only operative when the second-
ary throttle valves are opened.
MAIN
METERING
WELL BLEED
E WELL MT-15468
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