Lotus Esprit Series - Adjusting; Depression Valve; Flexible Carburetter Mounting; Throttle By-Pass Valve

FUEL SYSTEM
Page L14
Depression Valve
This valve was fitted to earlier vehicles only.
It controls the
admissiorl of vacuum to
the by
- pass valve, thus ensuring smoother transition between deceleration and idle.
The valve
is pre - set and requires no attention in Service.
Throttle By
- Pass Valve
The throttle by
- pass valves are incorporated to prevent excessive rates of hydrocarbon
and CO
emissiorl. Manifold depression, acting on the valve diaphragm will cause
the valve to open when a pre - determined value is reached that will overcme the
spring load.
The valve
is pre - set, and providing that it is free from air leaks, should not
normally require attention
in Service.
At any point in the throttle range, a temporary enrichment
is needed when the
throttle
is suddenly opened. To provide this, a hydraulic damper is arranged inside
the hollow guide rod of the air valve.
-.
I he rod itseif is tiiied with suitable oil (engine oil) to within a 6.35mm (.025in) of
the end of the rod. When the throttle
is suddenly oper~ed, the immediate upward
motion of the air valve is resisted by the damper. For this brief period, a temporary
increase in the depression over the
iet orifice is achieved and the mixture is enriched.
Downward movement of the air valve
is assisted by a coil spring.
Flexible Carburetter Mounting
When assembling the
adaptor flange/corburettor assemblies to the inlet manifold, the
'0' rings should be located carefully and the nuts adiusted to give an even gap of
1.78mm (.070in) between the flange and the manifold.
ADJUSTING
There are three
adiustments that can be made to Exhaust Emission carburetters in
Service, and these are:
ESPRIT
Issue 04/78