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FIG 2:2 Fuel
pump pressure
test
It must
be borne in mind that the restriction
imposed
by a clogged air cleaner will reduce
the volume
of air,
and consequently mixture which
the engine
can
inspire,
and so lead to
power
loss.
When this happens,
miles to
the
gallon
will fall.
The
Solex bi-starter is
a
small
auxiliary carburetter
integral with
the main
carburetter to ensure easy
starting
from
cold, and to help
'get-away'
until the engine is
warm
enough to function satisfactorily without
its
aid.
It has
two ad.iustable units to
provide
a corÍect
balance
oÍ air and oetrol.
1 The air
jet
(Ga)
meters the air
supply
(see
FIGS 2:3
and 2 :5).
2 The
petrol
jet
(2)
regulates
the
petrol.
To start
the engine when
cold:
1 Fully
pull
out the dashboard control to which the
bi-starter
lever is connected. In this
position,
it
gives
a very
rich
mixture which is essential Íor cold running.
2 Almost
immediately
after starting, ïhe engine
begins
to warm up; the dashboard control should
be
pushed
into the bi starter
position.
that
is,
about halfway,
when a marked resistance will
be
felt, indicating that
the correct Dosition has been
reached.
3 At this stage
the mixture strength is considerably
reduced.
Íor
the
volume
of air
inspired
by the engrne
increases
proportionately
to the rise in engine speed
as
it
continues
to warm
up,
while the
petrol
supply is
restricted.
The strength oÍ the mixture
is
sufÍicient
to
ensure
immediate
get-away
without stalling
as
the
accelerator is deoressed.
4
As soon as
the engine is warm enough
(usually
after
driving
a
few
hundred
yards).
to dispense
with the
bi-starter, the dashboard
control must
be
pushed
f ully
home. thus
putting
the
starting device
completely out
of action.
When idling
the
mixture
strength is
provided
by the
idling
or
pilot
let
(gn),
the air bleed
(u),
the volume
control
screw
(w),
the last decreasing the mixture
strength
when
turned
in
a
clockwise direction, and vice
versa. For normal
running, driving at cruising speeds, the
Íuel is
provided
by the main
jet
(Gg),
and the main air
supply by
the choke tube
(l().
The correct balance of
mixture
is Íurther automatically
maintained
by
the
addrtional air supply
in the form oÍ a calibrated
jet
called
the air correction
jet
(a).
Letters in brackets refer to
FIG 2:3.
The accelerator
pump:
When the throttle is closed, the expansion spring in
the
pump
chamber forces the
diaphragm
(M),
into a
definite
position,
allowing the chamber
on
the leÍt
to
Íill
with
petÍol.
The diaphragm
is
connected to the accelerator
by
an
adjustable linkage
fixed
to the throttle spindle;
thus, the
instant
the throttle is opened, the spindle turns
and the
link
operating
with it forces the diaphragm to the left,
ejecting the
petrol
in
the
pump
chamber through
the
$ump let
(4)
and
via
the ejector
(2) projecting
into
the choke tube area
(see
FIG 2 :4).
The volume
of the
injection
is
regulated
by the
adjustment oÍ the linkage. The size
oÍ
the
jet
(4)
controls
the
speed of the injection.
GP
-'-w
FIG 2:3
Carburetter, diagrammatic
F Float
Ga Starterairjet Gg Main
jet
Gp
Pumpjet
Gs
Starterpetrol
jet
Choke tube L Pump lever
L1 StaÍter
lever
M Pump diaphragm
P Needle valve
V Throttle
butterÍly W Volume control screw Y Main
jet
carrier
Key
to
Fig 2:3
a Correction
jet
gN
Pilot
Jet
H Pump valve K
s
Emulsion
tube
u
ldling air
bleed
P404
25
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