4 cylinder, 4 stroke liquid/air cooled engine with opposed cylinders, dry sump forced lubrication with separate 3l (.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
	kW	HP	RPM	Nm	ft. lb.	RPM	RPM
912 ULS2	69.0	95	5500	128	94	5100	5800
Max 5 min (take-off)	73.5*	100*	5800*	* with Rotax airbox & exhaust system

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

Detailed Info

The 100HP* 912 ULS aircraft engine is based on the field proven 81 HP Rotax 912 UL design.

The Rotax 912 ULS is not simply an 81 HP 912 UL with different pistons. Through careful research and development, Rotax has made many design changes and improvements to obtain performance increases while maintaining the same external dimensions.  Click here for a detailed list of component differences between the 912 ULS and the 81 HP 912 engines. (PDF document) See important installation information for more details.

Options
912 ULS3	Suitable for 'Constant Speed' propellers. Includes: drive for hydraulic variable speed governor Woodward variable speed governor (part# 886 730) Slipper clutch for reduction gearbox.
912 ULS4	Suitable for 'fixed pitch' propellers Same as Rotax 912 ULS2 but fitted with propeller shaft that would allow the engine to be converted to a 912 ULS3 for use with a constant speed propeller.

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