Rotax 914 UL DCDI 115HP

by Michael A. Anderson

Rotax 914 UL DCDI 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
  • Automatic adjustment by hydraulic valve tappet
  • Dual Capacitor Discharge Ignition (DCDI) with RFI noise suppression
  • 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, Woodward hydraulic propeller governor
  • Operates on automotive fuel with a minumum 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 Torque 106ft-lb / 144NM @ 4900 RPM

Combustion Chambers

Bore 3.13″ / 79.5mm
Stroke 2.40″ / 61.0mm
Displacement / 1211.2cm³
Compression ratio 9.0:1


Engine with Carburetors 141.1lbs / 64.0Kg
Exhaust System 8.8lbs / 4.0Kg
Air Filter 0.4lbs / 0.2Kg
Liquid Radiator 2.2lbs / 1.0Kg
Oil Radiator 1.1lbs / 0.5Kg
Engine truss assembly 4.4lbs / 2.0Kg
Regulator-Rectifier 0.2 lbs / 0.1Kg
Electric Fuel Pumps 1.5lbs / 0.7Kg
External Alternator 6.6lbs / 3.0Kg
Installed Weight 166.4lbs / 75.5Kg
Weight/Power Ratio 1.45lbs/HP / 0.88Kg/KW


Information Sheet 914info.pdf / 406Kb / Adobe Acrobat format
Performance Graphs 914perf.pdf / 14Kb / Adobe Acrobat format
Technical Drawings 914draw.pdf / 311Kb / Adobe Acrobat format
Service Documentation