Datsun C210 series Manual page 88

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Secondary main nozzle
2
Secondary
main air
bleed
3 Secondary
slow air bleed
4 Secondary slow
jet
5
Needle valve
6
Needle valve spring
7 Float
8
Secondary
emulsion tube
9
Secondary
main
jet
PRIMARY
SYSTEM
Primary
main
system
The primary
main
system
is
3
Solex
type
Fuel flows
as
shown in Figure
EF II
through
the main
jet mixing
with
air which
comes
in
from the
main
air
bleed
and passes
through
the emul
sion tube and is
pulled out
into the
venturi
through
the main nozzle
Idling and slow system
During
low
engine
speed
as
shown
in
Figure
EF II
fuel flows through
the slow jet located immediately
behind the main
jet mixing
with
air
Engine
Fuel
10 By pass hole
11
Secondary
throttle valve
12 Primary
throttle valve
13
By
pass hole
14
Idle hole
15
Primary
main
jet
16
Primary
emulsion tube
17
Primary
slow air bleed
18 Primary slow
jet
coming
flOm he air bleed and then
is
pulled
out
into the
engine through
the
idle hule
and
bypass
hole
Adoption of
the
submerged type of
slow jet eliminates such hesitation
as
occurs on
sudden deceleration of the
car
Small
opening
of the throttle valve
at idling
or
partial
load
creates a
large
neg alive
pressure
in the intake
manifold
By
this
negative
pressure
fuel
is
measured through
the
slow jet located
behind
the main
jet
And air
coming
from the slow
air
bleed
is mixed with
fuel
in the emulsion
hole
The atomi7 ed mixture is supplied
to
the
engine
from
the idle
hole and
EF 9
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19
Primary
main nozzle
20 Primary
main air bleed
21 Air
nt
pipe
22 Choke valve
23 Slow economizer
Note
Do
not
remove
the
parts
marked with
an
asterisk
EF641
Fig EF II
Sectional view
of
carburetor
bypass
hole via the slow system
pas
sage
Accelerating
mechanism
The
carburetor
is
equipped
with the
piston
type
accelerating
mechanism
linked to
the throttle
valve When the
primary
throttle
valve is
closed the
piston
goes up
and fuel flows from
the float
chamber through the inlet
valve into the space
under the
piston
When
the
throttle valve
is
opened
the
piston
goes
down opening
the outlet
valve and fuel is forced
out
through
the
injector