Exhaust System Requirements; Technical Data; If A Genuine-Rotax Exhaust Is Not In Use - Rotax 912 i Series Installation Manual

2) Exhaust system requirements

See
General note
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
2.2)

If a GENUINE-ROTAX exhaust is not in use

The four supplied exhaust sockets with exhaust flange and lock nuts
General note
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:
Effectivity: 912 i Series
Edition 1/Rev. 2
BRP-Powertrain
INSTALLATION MANUAL
Fig. 4 and Fig. 5.
Non-compliance can result in serious injuries or
WARNING WARNUNG
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
NOTICE
WARNUNG
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
NOTICE
WARNUNG
to installation requirements (Lockwire, heat-resistant
silicone to dampen the exhaust spring etc.).
The performance specifications relate to ISA (15 °C)
NOTICE
WARNUNG
(59 °F)) conditions and are only achieved if the engine
is equipped with an unmodified GENUINE-
ROTAX exhaust system and airbox.
each case approx. 100 mm (3.94 in.) beyond the end of the exhaust
flange
The exhaust flange must not touch the cylinder head.
78-00-00
Page 5
January 01/2014