Reference
Modification no.
- 0 -
Page
52
Date
1997 02 01
Main
914 F
01476
9.5) Turbo charger and control system
The ROTAX engine 914 F is equipped with an exhaust gas turbo charger, making use
of the energy in the exhaust gas for pre-compression of the intake air.
The boost pressure in the airbox is controlled by means of an electronically controlled
flap (waste gate) on the exhaust gas turbine.
The actuating off the waste gate is carried out by an electric servo motor.
9.5.1) Exhaust gas turbo charger
See Pic. 26.
The exhaust gas turbo charger is basically an arrangement of two turbo
machines, a turbine and a blower on a common shaft.
The turbine transforming the energy of the hot exhaust gases drives a blower
which aspirates ambient air and transfers it pre-compressed via the carbure-
tors into the cylinders.
The sole operational connection between engine and turbo is the air- and
exhaust stream. Speed of the turbo depends mainly on pressure ratio at
blower but not directly on engine speed.
â—† NOTE: Pic. 26 depicts a schematic arrangement of a boost pressure
control with the waste gate in exhaust stream
Q engine
W exhaust gas turbo charger
E waste gate
Because of the large speed range of the engine and the varying power
demand, control of the turbo charger is necessary to achieve the respective
target pressure in the airbox.
By action of the waste gate part of the engine exhaust gases bypasses the
turbine and flows directly into the muffler.
â—† NOTE: With waste gate completely open, the engine performance
can reach up to 70 kW since not all of the exhaust gases
bypass the turbine.
Pic. 26
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