Rotax 912 specifications, Rotax 912 specs performance curve, fuel consumption.

Light Sport & Ultralight Aircraft Information.

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Rotax Logo 912 Engine Picture


4 cylinder 4-stroke liquid/air cooled engine with opposed cylinders, dry sump forced lubrication with separate 3 liter (.8 gal US) oil tank, automatic adjustment by hydraulic valve tappet, 2 CD carburetors, mechanical fuel pump, electronic dual ignition, electric starter, integrated reduction gear i = 2.43

Version Performance Torque max RPM
912 Engine Performance Graph
kW hp 1/min Nm ft. lbf. 1/min 1/min
912 ULS 69 95 5500 128 94 5100 5800
max. 5 min. 73.5* 100* 5800*

* with ROTAX Airbox and exhaust system

Bore Stroke Displacement Compression Ratio
84 mm 3.31 in 61mm 2.4 in 1352 cm3 82.6 cu. in. 10.5:1
912 Engine Torque Graph

Fuel Oil Cooling liquid
min RON 95 API SF or SG 50% Water/Coolant

*leaded or unleaded or AVGAS 100 LL

Ignition unit Ignition timing Spark plug
DUCATI Doppel CDI 4 degree up to 1000 RPM / above 26 degrees ROTAX PART No 297 940

Generator performance RPM Voltage
250W DC 5500 13.5 V

WEIGHT (Standard) kg lb
Engine with gearbox i = 2.43 56.6 124.8
WEIGHT (Options) kg lb
Oil radiator 886 029 0.5 1.1
Radiator 995 697 1.0 2.2
Slipping clutch 1.7 3.7
Airbox 1.3 2.8
Air cleaner 0.15 0.3
Exhaust system 4.0 8.8
Air guide hood 975 795 0.8 1.8
Vacuum pump 0.8 1.8
Hydraulic pump governor 2.7 5.9
External alternator 40A/12V DC 3.0 6.6
Engine truss assembly 2.0 4.4
Rectifier regulator 0.1 0.2
Instrument FLYdat 0.5 1.1
Recall instrument RDAT 1.0 2.2
Fuel pump with install fuel lines 0.2 0.4


This aircraft engine does not comply with federal safety regulations for standard aircraft. This engine is for use in experimental and ultralight uncertified aircraft only and only in circumstances in which an engine failure will not compromise safety. Before operating the engine read operator's manual. Information is available from you local authorized ROTAX distributor.

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