This 5.2 liter, 6 cylinder engine delivers up to 180 hp and runs on minimum 95 oct mogas!

With only 108 kg (238 lb) you will love this engine.



  • 4 stroke, 6 cylinder, horizontally opposed
  • Dual (redundant) electronic spark ignition (variable timing)
  • Electronic multipoint fuel injection (pressure and temperature compensated)
  • Electronic RPM limiter
  • Direct propeller drive
  • 7 bearing crankshaft with surface hardening treatment and additional large thrust bearing (ball bearing type)
  • Single central camshaft
  • Push rods, tappets and OHV (hydraulic compensators have not been used)
  • Wet sump forced lubrication with integrated pressure regulator
  • Ram air cooled cylinders and cylinder heads
  • Integrated permanent magnet AC generator, external rectifier-regulator
  • Electric starter
  • Electric fuel pump and pressure regulator to eliminate vapor lock and facilitate starting even under adverse conditions
Displacement 5254 cc
Bore 105.6 mm
Stroke 100 mm [3.937 in]
Compression Ratio 8 : 1
Firing Order 1 – 4 – 5 – 2 – 3 – 6
Direction of Rotation Clockwise – Pilot’s view
Maximum Torque
(ISA conditions)
425 Nm [236 ft.lb] @ 2600 rpm
Power rating
(ISA conditions)
180 hp @ 3300 rpm / 170 hp @ 2800 rpm
Installed weight 108 kg (including starter motor and alternator)
DC output 50 A
Oil capacity 4 L
Fuel MOGAS with min. 95 octane rating or AVGAS (95 Oct = 87MON = 91 AKI)




Power / Torque curve

The power and torque curve of the engine has been established by repeated dyno tests, which were performed at sea level and in weather conditions close to the ISA standard. The following graph shows the real, available power and torque coming from the crankshaft of the UL520i engine corrected to the International Standard Atmosphere conditions at sea level.

Power vs Density Altitude

The following graph shows the calculated available power of the UL520i engine at different RPM settings, WOT (wide open throttle) and varying density altitude.

Power vs MAP

For more information on ISA, density altitude, interpretation of this graph, the conversion of the figures to actual atmospheric conditions, refer to the “Engine Resources” section on our website and more specifically: “ISA conditions & conversion”.




Dimension Weight
Maximum dimension in X direction (length)* 723 mm [28.4 inch]
Maximum dimension in Y direction (width)* 736 mm [28.97 inch]
Maximum dimension in Z direction (height)* 472 mm [18.6 inch]


  • Dry weight of the basic standard engine from serial production: 93,3 kg (205 lb)
  • Ready-to–fly weight: 108 kg (238 lb)

For more details please check the installation manual.




Fuel consumption (Liter/hour)

Specific fuel consumption

These are values at full throttle. When cruising estimated average is UL520 ±25l.
(depending on type of plane, personal style of flying, cruise speed , climate circumstances)




The following is a list of the ULPower engine standard design features, all included at no additional cost.

  • Dual (redundant) electronic spark ignition (variable timing)
  • Multi-point electronic fuel injection with automatic altitude and temperature compensation
  • Electronic RPM limiter
  • Rubber mounts
  • Alu ram airboxes
  • Breather with Oil/Air separator (including: temperature resistant hoses and banjo connections)
  • Direct propeller drive
  • Wet sump forced lubrication with integrated pressure regulator
  • Stainless steel exhaust and muffler included
  • One electric fuel pump, two fuel filters, fuel pressure regulator and air filter

Extra options

  • EGT Sensor kit
  • CHT Sensor kit
  • Fuel connection kit
  • Oil Cooler kit
  • Double ecu
  • Different types of prop flanges
  • Different exhaust systems
  • Swiveling oil pick-up tube
  • Dual alternator
  • Forced air cooling

Please contact us for more info / prices








Front 3/4 – 2.55 MB

Front top 3/4 – 2.71 MB

Back – 2 MB

Back top – 2.07 MB

Front – 2.56 MB

Front top – 2.14 MB

Left side – 1.77 MB

Right side – 1.96 MB

Manual (Latest version)

CAD Model