OceanSphereENGINES

8LW31

Main Engine 4-Stroke · Main Engines (4-Stroke)

Class-certified type (DNV register) · technical data sheet not yet verified​‌⁠‍​​⁠‌‍‌⁠​⁠⁠⁠⁠‌‌​‌
8Cylinders
310 mmBore
430 mmStroke

The Wärtsilä 8LW31 is a marine engine designed for high-performance applications. This model, part of the W31 family, features an 8-cylinder, 4-stroke configuration with a bore of 310 mm and a stroke of 430 mm, delivering a robust power output of 2440 kW at 750 RPM. Known for its dual-fuel capability (HFO/MDO), the Wärtsilä 8LW31 is equipped with two-stage turbocharging and common rail direct injection, ensuring efficient operation across various fuel types. Common maintenance challenges include issues during low-load operations due to carbon deposit accumulation and potential cylinder liner wear from inadequate lubrication. Regular inspection and adherence to manufacturer guidelines are crucial for optimal performance and longevity.

Specifications

Technical data.reference — unverified

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Cylinder power610 kW/cyl (diesel)
Mean effective pressure (BMEP)30 bar
SFOC (diesel)167.7 g/kWh (optimal point)
Weight (8V31)~57.1 tonnes (dry, diesel)
Weight (16V31)~89–92.5 tonnes (dry, diesel)
Piston speed10.75 m/s
TurbochargingTwo-stage turbocharging with intercooling
Fuel injectionCommon rail direct injection
Valve layout2 inlet, 2 exhaust valves per cylinder
Speed (rpm)750
Fuel TypeHFO/MDO
ConfigurationL
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