This engine has all ready-to-fly features and has a perfect budget/quality ratio.
As it supports Avgas, Mogas 98 but also Mogas 95 it can be used all over the world.



  • 4 stroke, 4 cylinder, horizontally opposed
  • Dual (redundant) electronic spark ignition (variable timing)
  • Electronic multipoint fuel injection (pressure and temperature compensated)
  • Electronic RPM limiter
  • Direct propeller drive
  • 5 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 3503 cc [213.77 cu in]
Bore 105.6 mm [4.157 in]
Stroke 100 mm [3.937 in]
Compression Ratio 8 : 1
Firing Order 1 – 3 – 2 – 4
Direction of Rotation Clockwise – seen from cockpit
Maximum Torque
(ISA conditions)
305 Nm [225 ft.lb] @ 2400 rpm
Power rating
(ISA conditions)
118 hp @ 3300 rpm / 116hp @ 2800 rpm
Installed weight 78.4 kg [172.8 lbs] (including all accessories, oil and exhaust)
DC output 30 Amp (+/- 15 Amp available above engine/fuel pump needs)
Oil capacity 2.5 L [0.66 US gal]
Fuel Regular unleaded automotive gasoline with min. 95 Octane RON (87 MON = 91 AKI)
AVGAS 100LL may also be used if regular fuel is not available.



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 UL350i 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 UL350i 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)* 553.0 mm [21.7 inch]
Maximum dimension in Y direction (width)* 735.6 mm [28.96 inch]
Maximum dimension in Z direction (height)* 472 mm [18.6 inch]


  • Dry weight of the basic standard engine from serial production: 66,1 kg (145,73 lb)
  • Ready-to–fly weight: 78,4 kg (173 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 UL350 ±18l.
(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 – 2.61 MB

Back – 2.24 MB

Back – top – 2.34 MB

Front – 2.57 MB

Front top – 2.48 MB

Left side – 1.67 MB

Right side – 1.74 MB

Manual (Latest version)

Manual (Older versions)

CAD Model