78-00-00
page 4
October 01/2010
Effectivity 912/914 Series
Edition 1 / Rev. 3
d04781
BRP-Powertrain
Maintenance Manual
◆
NOTE:
If replacement of any single old part number is necessary, you
must replace it with the same old part number. If the old part
number is not available, the entire assembly including all 4 pipes
and manifold must be replaced with new part numbers. New style
pipes and manifold are not interchangeable with old style.
2.3)
Turbocharger (only on the 914 Series)
ROTAX engines of the 914 Series are equipped with an exhaust turbocharger
which makes use of the energy in the exhaust gas for precompression of the
intake air.
The boost pressure in the airbox is controlled by means of an electronically
controlled flap (wastegate) on the exhaust gas turbine.
The wastegate is actuated by an electric servo motor via a bowden cable.
2.3.1)
Exhaust turbocharger
See Fig. 78-1
The exhaust turbocharger is basically an arrangement of two turbo
machines, a turbine and a blower, on a common shaft.
The turbine transforms the energy of the hot exhaust gases and drives
a blower which aspirates ambient air and transfers it precompressed via
the carburetors into the cylinders.
The sole operational connection between engine and turbo is the air and
exhaust stream. The speed of the turbo depends mainly on the pressure
ratio at the turbine impeller but not directly on engine speed.
00136
1
2
3
Fig. 78-1
Summary of Contents for MMH-912 Series
Page 463: ......
