Effectivity 912/914 Series
Edition 1 / Rev. 0
78-00-00
page 3
May 01/2007
d02627
BRP-Rotax
Maintenance Manual
2.) Systems description
2.1) Exhaust system (on the 912 Series)
On ROTAX engines of the 912 Series, the exhaust system is not included in the
ROTAX range of delivery. The engine is supplied only with the 4 exhaust sockets
on the cylinder head.
The exhaust system must be configured or manufactured by the aircraft or
fuselage manufacturer.
For disassembly, inspection and assembly of the exhaust system, observe the
aircraft manufacturer´s instructions.
2.2) Exhaust system (on the 914 Series)
The exhaust system on ROTAX engines of the 914 Series collects all gases
which accumulate in the combustion chamber of the cylinders and routes them
via exhaust bends and exhaust manifold to the exhaust turbocharger. There, the
combustion gases drive the exhaust gas turbine to achieve a power increase.
See 78-00-00 sec. 2.3. From the exhaust turbocharger, the combustion gases
are routed to the muffler, which is fitted for noise reduction.
The exhaust system is made of stainless steel. The exhaust bend is connected
to the exhaust manifold by means of slide sleeves to ensure that expansion due
to heat can be compensated for.
The exhaust bends are sealed to the cylinder head by the ridge on the exhaust
bends. The muffler is supported via the exhaust bracket on the engine
suspension frame.
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.
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