Mercedes-Benz 602, Service Manual

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Idle and Lower Part Load
No boost pressure occurs during idling and in
the lower part load range; therefore, the engine
operates as a naturally aspirated engine.
Upper Part Load and Full Load
As the engine load and speed increase, e.g. with
an increase in the exhaust gas flow, the turbine
wheel (i) is accelerated producing a boost
pressure up to a certain value via the
compressor wheel (d). The compressed charge
air is passed through the charge air pipe to the
individual cylinders. The boost pressure allows
an increased quantity of fuel to flow through the
ALDA unit at the injection pump.
Although boost pressure exists in the decelera-
tion mode, fuel injection is stopped as a result of
the control rod position (deceleration fuel cutoff).