d05787.fm
INSTALLATION MANUAL
BRP-Powertrain
Effectivity: 912 i Series
Edition 1/Rev. 2
78-00-00
Page 5
January 01/2014
2) Exhaust system requirements
General note See Fig. 4 and Fig. 5.
2.1) Technical data
- Average radius of exhaust manifold: at least 40 mm (1.57 in.)
- Inner diameter of manifold pipe: at least 28 mm (1.10 in.)
- Damping volume: approx. 5 l (1.32 US gal)
- Back pressure at maximum power: max. 0.2 bar (2.9 psi) measured in
each case approx. 100 mm (3.94 in.) beyond the end of the exhaust
flange
2.2) If a GENUINE-ROTAX exhaust is not in use
General note The four supplied exhaust sockets with exhaust flange and lock nuts
must be used.
Exhaust sockets material: X6CrNiMoTi 17 12 2 (DIN 1.4571)
Tightening torque of M8 lock nuts: min. 15 Nm (133 in.lb.)
NOTE: The exhaust flange must not touch the cylinder head.
Non-compliance can result in serious injuries or
death!
The exhaust system must be designed and built so
that the permissible operating temperatures are
maintained and the max. exhaust gas temperatures
are not exceeded.
Install heat shields in required areas (fuel, oil, coolant
hoses or tubes) and/or on the electronic components.
Because of the high temperatures, provide suitable
protection against accidental contact.
Secure exhaust system by suitable means according
to installation requirements (Lockwire, heat-resistant
silicone to dampen the exhaust spring etc.).
The performance specifications relate to ISA (15 °C)
(59 °F)) conditions and are only achieved if the engine
is equipped with an unmodified GENUINE-
ROTAX exhaust system and airbox.
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