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. Certified according to FAR-33.

Version	Performance			Torque			Max RPM
	kW	HP	RPM	Nm	ft. lb.	RPM	RPM
912 S2	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 S aircraft engine is based on the field proven 81 HP Rotax 912 F design.

The Rotax 912 S is not simply an 81 HP 912 F 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 S and the 81 HP 912 F engines. (PDF document) See important installation information for more details.

Options
912 S3	Suitable for 'Constant Speed' propellers. Includes: drive for hydraulic variable speed governor Woodward variable speed governor (part# 886 730)
912 S4	Suitable for 'fixed pitch' propellers Same as Rotax 912 S2 but fitted with propeller shaft that would allow the engine to be converted to a 912 S3 for use with a constant speed propeller.

  Click here  to download the free Adobe Portable Document reader