1975 Datsun 280z FSM - Spooled up Racing

Engine Fuel
signal from the ignition coil does not
specify the timing for injection. It
specifies the frequency of injections
only, since the injection timing is
always set to be constant.
2. Air flow system
Intake air from the air cleaner is
metered at the air flow meter, flows
through the throttle chamber and into
the intake manifold, and then flows
through each intake manifold branch
into the cylinder. Air flow during
driving is controlled by the throttle
valve located in the throttle chamber.
During idling operation, the throttle
valve is in the almost closed position,
and the air is led through the bypass
port mounted to the throttle chamber.
In this case, the quantity of suction air
is adjusted by means of the idle speed
adjusting screw. During warming-up
operation, the air flow is bypassed
through the air regulator to increase
engine rpm.
EF-4