Main Engine 4-Stroke · Main Engines (4-Stroke)
The Wärtsilä 20VW31SG engine utilizes a V-configuration design with a four-stroke cycle, driven by two-stage turbocharging with intercooling for optimal power output. This marine engine is fueled by LNG (Spark-Ignited) and boasts a power output of 6000 kW, turning at a speed of 750 rpm. It features 20 cylinders, each with a bore of 310 mm and a stroke of 430 mm, contributing to its impressive cylinder power of 610 kW per cylinder (diesel). The 20VW31SG's Mean effective pressure (BMEP) reaches 30 bar, with a fuel consumption of 167.7 g/kWh at its optimal point. The engine's design incorporates common rail direct injection and a valve layout of 2 inlet and 2 exhaust valves per cylinder. It is recognized for its efficiency, with a piston speed of 10.75 m/s and a weight of approximately 57.1 tonnes (dry, diesel). This model is currently in production, first introduced in 2015, and has accumulated over 1 million running hours globally.
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