OceanSphereENGINES

20VW34DF

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

Class-certified type (DNV register) · technical data sheet not yet verified​‌⁠‍​‌​​​‌‍​⁠⁠‍‍⁠⁠‌​
7,800 kWPower
20Cylinders
340 mmBore
400 mmStroke
12 971, 3 418, 4 429Dimensions
20Voltage

This is a marine diesel engine. It is the Wärtsilä 20VW34DF, a 20-cylinder, 4-stroke engine with a V-configuration. It is a dual-fuel engine capable of running on both Liquified Natural Gas (LNG) and Heavy Fuel Oil (HFO). With a power output of 7800 kW at 720 rpm, the 20VW34DF boasts a bore of 340 mm and a stroke of 400 mm. Its design includes turbochargers and intercoolers. The engine is part of the W34DF family, known for its high power density and reliability. Wärtsilä specifies that the 20VW34DF is in production and its 34DF platform has been in use since 2009.

Specifications

Technical data.from datasheet

Every value below comes from the manufacturer datasheet or class-society record on file for this model.

Power per cylinder (main engine 34DF)500 kW @ 750 rpm
Power per cylinder (auxiliary 34DF)520 kW @ 720-750 rpm
Mean effective pressure (main)20.0-19.8 bar
Piston speed9.6-10.0 m/s
Compression ratio (16V/20V)12.6:1
Engine type4-stroke, turbocharged intercooled non-reversible
Swept volume per cylinder36.3 dm³
34DF Max output (16V main)8000 kW
34DF/34SG Max output (20V genset)9800 kW
34SG designSpark-ignited, lean-burn, pre-chamber
20V34SG dimensionsL:12.7m × W:3.3m × H:4.65m
20V34SG weight131,500 kg
Voltage20 V🔖
Dimensions12 971, 3 418, 4 429 mm🔖
Power (kW)7800
Speed (rpm)720
Fuel TypeLNG/HFO (Dual-Fuel)
ConfigurationV
📄
Download datasheet (PDF) (125 KB)
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