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Alpha Marine Propulsion Engines

Variable Speed 
1500 – 3000 r/min

6.8 – 37.5 kw  |  9.7 – 50.3 bhp

Range
20
22
30
33
40
43
50 Turbo


Download the Engine Data Sheet

The Alpha marine propulsion engine is specifically designed to suit for small offshore boats, work boats, pleasure craft and hire fleets. It is durable, reliable and easy to maintain with oil and filter changes up to 500 hours, dependent on operational conditions.

It is designed for continuous operation in ambient temperature up to 52°C (122°F) and cold start capability down to -32°C
(-25.6°F).


Basic Engine Characteristics 

  • 2, 3 or 4 cylinders
  • raw water heat-exchanger cooling
  • direct fuel injection
  • naturally aspirated and turbocharged
  • 4 cylinder
  • low fuel consumption
  • long service periods

Standard Equipment

  • heat exchanger
  • water cooled exhaust manifold
  • fuel filter / agglomerator
  • self-vent fuel system with fuel lift pump
  • individual fuel injection pump for each cylinder
  • high level oil filler and dipstick
  • raw water cooling system pump
  • operators' handbook (English)
  • thermostatically controlled cooling system with belt driven raw water pump
  • gear driven positive displacement type lubricating oil pump
  • spin on full flow lubricating oil filter
  • mechanical governing
  • gearbox adaptor and drive plate to suit PRM150 or PRM280 (LPWT4) gearboxes
  • cooling water header tank at gear end
  • 12V 70 Amp insulated earth return alternator and 12V 2.0 kW starter motor with earthing solenoid as standard
  • SAE5 flywheel housing
  • oil pressure and coolant temperature switches and VDO gauge senders
  • fuel control solenoid (energised to stop)
  • skid base packing

Options Items

A range of options enables are available that allows you to select a specification that matches your requirements.

  • keel cooling fittings
  • earth return electrics
  • 24V electrics
  • range of gearboxes (PRM, ZF or Techno Drive)
  • choice of air cleaners
  • high level bearers (wide or narrow options)
  • choice of engine control panels
  • range of gearbox mounting adaptors, and drive couplings
  • high output alternator
  • cooling water header tank mounted at flywheel end (not 50 Turbo)
  • anti-vibration mountings
  • sump lubricating oil drain pump (gear end or flywheel end mounting)
  • paint colour (standard is Peacock Blue)

Full Engine Specifications:

Power Output 

20-LPW2 22-LPWX2 30-LPW3 33-LPWX3 40-LPW4 43-LPWX4 50-LPWXT4
1500* 1500* 1500* 1500* 1500* 1500* 1500*
Continuous Power kWm 6.8 7.9 10.3 11.9 13.6 15.8 18.9
bhp 9.1 10.6 13.8 15.9 18.2 21.2 25.3
Fuel Stop kWm 7.5 8.8 11.8 13.2 15.0 17.6 20.9
bhp 10.0 11.8 15.8 17.7 20.1 23.6 28.1

Torque

20-LPW2 22-LPWX2 30-LPW3 33-LPWX3 40-LPW4 43-LPWX4 50-LPWXT4
r/min 2000 1800 2000 1800 2000 1800 1800
Nm 51 58 76 87 102 86 151

Fuel Consumption

20 22 30 33 40 43 50 Turbo
Load 1500* 1500* 1500* 1500* 1500* 1500* 1500*
g/kWh 224 245 261 261 253 271 209
l/h 2.0 2.3 3.2 3.7 4.1 5.1 3.7

Technical Data

20 30 40 50 Turbo 22 33 43
Type of fuel injection Direct Direct Direct Direct Direct Direct Direct
Number of cylinders 2 3 4 4 2 3 4
Aspiration Natural Natural Natural Turbocharged Natural Natural Natural
Direction of rotation looking on flywheel end Anti clockwise Anti clockwise Anti clockwise Anti clockwise Anti clockwise Anti clockwise Anti clockwise
Compression ratio 18.5:1 18.5:1 18.5:1 16.2:1 19.5:1 19.5:1 19.5:1
Total cylinder capacity litre 0.930 1.395 1.860 1.860 0.999 1.499 1.998
in 3 56.75 85.1 113.5 113.5 60.96 91.47 121.93
Nominal cylinder bore mm 86.0 86.0 86.0 86.0 86.0 86.0 86.0
in 3.39 3.39 3.39 3.39 3.39 3.39 3.39
Firing order 1-2 1-2-3 1-3-4-2 1-3-4-2 1-2 1-2-3 1-3-4-2
Off load idling speed 900 900 900 900 900 900 900
Number of flywheel ring gear teeth 96 96 96 96 96 96 96
Max continuous crankshaft end thrust kgf 180 180 180 180 180 180 180
lbf 400 400 400 400 400 400 400

BUY GENUINE LISTER PETTER SPARE PARTS

Your Lister Petter engine is precision engineered to give years of outstanding reliability and consistent performance in the most extreme temperatures and conditions.

SPARE PARTS