Rotax 912-UL User Manual

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page 9 - 4
Jan. 01/2007
Effectivity: 912 Serie
OM Edition 1 / Rev. 0
BRP-Rotax
9.4) Electric system
See fig. 7.
The ROTAX 912 engine is equipped with a dual ignition unit of a breakerless,
capacitor discharge design, with an integrated generator.
The ignition unit is completely free of maintenance and needs no external
power supply.
Two independent charging coils (1) located on the generator stator supply one
ignition circuit each. The energy is stored in capacitors of the electronic
modules (2). At the moment of ignition 2 each of the 4 external trigger coils (3)
actuate the discharge of the capacitors via the primary circuit of the dual
ignition coils (4).
Firing order: 1-4-2-3.
◆ NOTE: The 5
th
trigger coil (5) is planned for rev. counter signal.
B1/2
B3/4
A1/2
A3/4
fig. 7
00425
Ignition circuit A
Ignition circuit B
4
2
4
3
3
5
1

Rotax 912-UL Specifications

General

Displacement	1211 cc
Bore x Stroke	79.5 mm x 61 mm
Compression Ratio	9.0:1
TBO (Time Between Overhaul)	2000 hours
Engine Type	4-cylinder, 4-stroke
Power Output	80 hp
Cooling System	Liquid/air-cooled
Fuel Type	Avgas 100LL or unleaded automotive gasoline
Oil Capacity	3 liters
Fuel System	2 carburetors
Oil System	Dry sump forced lubrication with separate oil tank
Reduction Gear Ratio	2.43:1
Max Continuous Power	75 hp (56 kW)