Rotax 914

Rotax 914 UL  115HP

  • 4-stroke turbocharged engine specially developed for recreational aircraft. Also exists in a certified version: Rotax 914 F.
  • 4 horizontally opposed cylinders, "boxer" configuration
  • Free air cooled cylinders, liquid cooled cylinder heads with integrated pump and expansion tank
  • Dry sump forced lubrication with integrated pump and separate oil tank
  • 8 valves, automatic adjustment by hydraulic valve tappet
  • Dual Capacitor Discharge Ignition (DCDI) with RFI noise suppression
  • Garrett turbocharger with automatic waste gate control
  • Two Bing Constant Depression (CD) carburetors
  • Two electric fuel pumps
  • Integrated electric starter
  • Integrated reduction gearbox, ratio of 2.43:1 with optional slipper clutch
  • Various liquid and oil radiators available
  • Many option available such as: Vacuum pump, external alternator, hydraulic propeller governor
  • Operates on automotive fuel with a minimum octane rating of 91 (Canadian standards)
  • Time Between Overhauls (TBO): 1200 hours*


Maximum Power
(5 minutes)115HP / 84.5KW @ 5800 RPM

Maximum Power (sustained)100HP / 73.5KW @ 5500 RPM

Maximum Torque106ft-lb / 144NM @ 4900 RPM

Combustion Chambers

Bore3.13" / 79.5mm

Stroke2.40" / 61.0mm / 1211.2cm³

Compression ratio9.0:1


Engine with Carburetors141.1lbs / 64.0Kg

Exhaust System8.8lbs / 4.0Kg

Air Filter0.4lbs / 0.2Kg

Liquid Radiator2.2lbs / 1.0Kg

Oil Radiator1.1lbs / 0.5Kg

Engine truss assembly4.4lbs / 2.0Kg

Regulator-Rectifier0.2 lbs / 0.1Kg

Electric Fuel Pumps1.5lbs / 0.7Kg

External Alternator6.6lbs / 3.0Kg

Installed Weight166.4lbs / 75.5Kg

Weight/Power Ratio1.45lbs/HP / 0.88Kg/KW

EdgePerformance Rotax Kits

EP912STI 154HP Turbo & EFI

Here we combine the best of two worlds. The result is a beast of an engine. Our experience with this conversion is incredibly positive. We make such a conversion based on a standard Rotax 912ULS 100 HP. 

Fitted to these aircrafts and more: VL3 Evolution, WT-9 Dynamic, Shark, Sonex, Dobble Ender, Kitfox, Rans S6 C-II, Trixy Aviation Gyro, Xenon Gyro, ELA Gyro and more.

We perform the following to your engine:

  • Welded crankshaft
  • Balancing of crankshaft
  • Install EFI (Electronic Fuel Injection)
  • Install forged EP pistons with 8.5:1 CR with ceramic and teflon coating
  • Modify the gearbox for increased power and torque
  • Install our Turbocharger with dual port wastegate actuator
  • Install our ECU operated boost controller
  • Install modified 914 exhaust and muffler to our spec
  • Install EP Turbo camshaft