General Notes On The Exhaust System - Rotax 912 i Series Installation Manual

1) General notes on the exhaust system

An exhaust system especially designed for universal application has
Certification
been developed by BRP-Powertrain. Certification according to the latest
regulations, such as FAR or EASA, must be conducted by the aircraft or
fuselage manufacturer.
1.1) The following recommendations should help the aircraft or fuse-
lage manufacturer to select a suitable exhaust system.
The ideal is a common transversal damping element serving all 4 cylin-
Damping element
ders, positioned under the engine.
NOTE:
Distribution of the exhaust system into 2 separate systems is not recom-
Distribution of
the exhaust sys-
mended. Individual mufflers on either side cause power loss and
tem
increased engine noise.
During assembly, ensure that the flange is parallel to the cylinder head
Exhaust flange
flange and is not protruding.
NOTE:
There must be a clearance of at least 20 mm (0.79 in.) between the
Oil filter
exhaust pipe and the oil filter to allow the oil filter to be fitted and removed
without having to slacken off the exhaust system. If a heat shield is fitted,
this will also have to be taken into consideration.
Effectivity: 912 i Series
Edition 1/Rev. 0
BRP-Powertrain
INSTALLATION MANUAL
Vibrations due to improper installation and mainte-
NOTICE
WARNUNG
nance is the most common reason for damage of the
exhaust system.
Equal length of pipes from the cylinder to damping ele-
ment is recommended for better tuning.
Tighten the exhaust flange evenly and in parallel. There
must be a gap of the same size all the way round.
The exhaust system must not adversely affect the op-
NOTICE
WARNUNG
eration or replacement of the oil filter.
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January 01/2012