Wärtsilä Equipment
Wärtsilä 31 Marine Engine
Medium-speed 4-stroke marine engine in diesel, dual-fuel and pure gas versions; 8–16 cylinders, 4.6–10.4 MW at 720/750 rpm, 650 kW/cyl (diesel); NextDF cuts methane slip up to 85%.
Description
The Wärtsilä 31 is a medium-speed 4-stroke marine engine recognised by Guinness World Records as the world's most efficient 4-stroke diesel engine. It is available in diesel, dual-fuel (31DF) and pure gas versions and keeps its performance across the complete operating range.
Technical data
- Cylinder configurations: 8 to 16
- Power output: 4.6 – 10.4 MW at 720 and 750 rpm
- Cylinder output: 650 kW/cylinder (diesel engine)
- In service since 2018
Key features
- Low fuel consumption over a wide operating range
- High power per cylinder saves space; extended service intervals
- IMO Tier III on gas, and with SCR on diesel fuel
- NextDF ultra-low emissions option for 31DF in gas mode: up to 85% further reduction in methane slip and near-elimination of NOx; for constant- and variable-speed applications
- Optional Smart Heat Recovery
- Hybrid integration with batteries for optimal engine loading
Applications
- Ferries
- Fishing vessels
- Luxury cruise ships and superyachts (e.g. Ritz-Carlton Yacht Collection's Ilma)
- Icebreakers (e.g. Le Commandant Charcot, Aker ARC 124)
- Diesel-electric configurations and auxiliary engines
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