Rotax 912 i series Operator's Manual

Effectivity: 912 i Series BRP-Powertrain page 7-2
OM Edition 1/Rev. 0 January 01/2012
d05871.fm
7.1) Cooling system of the engine
General note See Fig. 1.
Cooling The cooling system of the engine is designed for liquid cooling of
the cylinder heads and ram-air cooling of the cylinders. The coo-
ling system of the cylinder heads is a closed circuit with an expan-
sion tank.
Coolant The coolant flow is forced by a water pump, driven from the cams-
haft, from the radiator to the cylinder heads. From the top of the
cylinder heads the coolant passes on to the expansion tank (1).
Since the standard location of the radiator (2) is below engine le-
vel, the expansion tank located on top of the engine allows for
coolant expansion.
Expansion tank The expansion tank is closed by a pressure cap (3) (with excess
pressure valve and return valve). At temperature rise of the
coolant the excess pressure valve opens and the coolant will flow
via a hose at atmospheric pressure to the transparent overflow
bottle (4). When cooling down, the coolant will be sucked back into
the cooling circuit.
Coolant tempera-
ture measuring
NOTE: The temperatur sensor at delivery is located in
cylinder head 4.

Rotax 912 i series Specifications

General

Number of Cylinders	4
Max Power	100 hp (73.5 kW)
Max Power Output RPM	5800 rpm
Ignition System	Dual electronic ignition
Oil System	Dry sump, forced lubrication with separate oil tank
Reduction Gear Ratio	2.43:1
TBO	2000 hours
Engine Type	4-stroke, horizontally opposed
Displacement	1352 cm³
Bore x Stroke	84 mm x 61 mm
Max Torque	128 Nm
Fuel Type	Avgas 100LL or unleaded automotive gasoline
Fuel System	Electronic fuel injection
Cooling System	Liquid/air-cooled