Wärtsilä
Wärtsilä 20 / 20DF / 20 Methanol
Compact engine of 740–1,980 kW (20DF 870–1,755 kW) for auxiliary gensets and small propulsion; methanol version in development.
Engine designers & manufacturers products
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Wärtsilä
Wärtsilä 25 / 25DF / 25 Ammonia
Medium-speed engine of 1.9–3.4 MW (6L–9L) in diesel, dual-fuel and ammonia versions.
Wärtsilä
Wärtsilä 31 / 31DF / 31SG / 31 Methanol
High-efficiency engine of 4.6–10.4 MW (650 kW/cyl diesel) in diesel, dual-fuel, pure-gas and methanol versions.
Wärtsilä
Wärtsilä 32 / 32 Methanol
Widely deployed medium-speed engine; the 32 Methanol (3.4–5.2 MW) launched in 2022, first deliveries 2023.
Wärtsilä
Wärtsilä 46F / 46DF / 46F Methanol
Large-bore 600 rpm engine of 7.5–20 MW in diesel, dual-fuel, methanol-ready and methanol versions.
Weichai
Weichai WH20 medium-speed engines
Inline 6- and 8-cylinder medium-speed engines of 905-1,765 kW at 750-1,000 rpm for propulsion and gensets; LNG and methanol variants.
Yanmar
EY series medium-speed engines
Medium-speed diesel engines for main propulsion (6EY17W to 8EY33W) and gensets (6EY18ALW to 8EY33LW) at 720–1,000 rpm.