UL390i

  • 100kg
  • 140hp
  • contact us

If you want more power and mogas 98 is available, the UL390iS is an excellent choice for your 2 or 4 seats plane.

This heavy duty engine is the perfect all-rounder.

  • 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 3888 cc (237.2 cu in)
Bore 105.6 mm [4.157 in]
Stroke 74 mm [2.913 in]
Compression Ratio 8.16 : 1
Firing Order 1 - 4 - 5 - 2 -3 - 6
Direction of Rotation Clockwise - seen from cockpit
Maximum Torque
(ISA conditions)
320 Nm [236 ft.lb] @ 2800 rpm
Power rating
(ISA conditions)
140 hp @ 3300 rpm / 130 hp @ 2800 rpm
Installed weight 100 kg [220 lbs] (including all accessories, oil and exhaust)
DC output 50 A
Oil capacity 4 L [1.05 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 UL390i 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 UL390i 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".

Dimensions

Dimension Weight
Maximum dimension in X direction (length)* 723 mm [28.4 inch]
Maximum dimension in Y direction (width)* 654 mm [28.97 inch]
Maximum dimension in Z direction (height)* 472 mm [18.6 inch]

Weights

  • Dry weight of the basic standard engine from serial production: 85,3 kg (188 lb)
  • Ready-to–fly weight: 100 kg (220.4 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 UL390 ±21l.
(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

More questions? We've got you covered!

Visit our engine FAQ or contact us.

Note: Pictures may not always represent the exact colour or shape.
All prices indicated are excluding taxes and transportation costs.
Deliveries to private individuals within the European Union are subject to 21% Belgian VAT. Prices subject to change without notice.