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Brayton Ready Motor Hydrocarbon Engine - George Brayton was a pioneer of the internal combustion engine and built commercially available engines starting in 1872. However, his constant-pressure cycle engines were outperformed by later engines.
Duesenberg 12-Cylinder Marine Engine and the Disturber IV - First run in 1914, James Pugh’s Disturber IV was powered by two straight 12-cylinder engines built by the Duesenberg brothers. Each engine displaced 3,221 cu in (52.8 L) and produced 800 hp (597 kW).
Duesenberg W-24 Marine Engine - In 1925, Horace Dodge Jr contracted the Duesenberg brothers to build an engine for his Gold Cup race boat. Plagued with issues, the engine would not find glory until 1937 and with a different owner.
General Motors / Electro-Motive 16-184 Diesel Engine - The General Motors / Electro-Motive 16-184 was a vertical X-16 marine engine that produced 1,200 hp (895 kW). Because of its stacked cylinder configuration, it was nicknamed a pancake engine.
Idroscivolanti and the Raid Pavia-Venezia - In the 1930s, Idroscivolanti (Italian for airboats) powered by aircraft engines raced in the 269-mile (433-km) Raid Pavia-Venezia and reached speeds up to 80 mph (128 km/h).
MAN Double-Acting Diesel Marine Engines - In the first half of the 20th century, MAN (Maschinenfabrik Augsburg-Nürnberg) developed a number of double-acting, two-stroke, diesel, marine engines, including a V-24 that displaced 224,957 cu in (3,686 L).
Mercedes-Benz 500 Series Diesel Marine Engines - The Mercedes-Benz MB 500 series diesel marine engines evolved from the Daimler-Benz DB 602 aviation engine and were first built in the 1930s. Some versions of MB 500 series are still in use today.
Michel Opposed-Piston Diesel Engines - Starting in the 1920s, German engineer Hermann Michel designed a series of opposed-piston engines. Michel’s ultimate design was an engine in which three pistons converged in a common combustion chamber.
Miller 1,113 cu in V-16 Marine Engine - Harry Miller built two 1,113 cu in (18.25 L), supercharged, V-16 marine engines for Gar Wood in 1931. For a time, the 1,800 hp (1,342 kW) engines were installed in the Miss America VIII speedboat.
Versuchs Schnellboot 5 (VS 5) Semi-submersible Attack Boat - Versuchs Schnellboot 5 (VS 5) was a semi-submersible ship designed by Rudolf Engelmann to achieve high speeds and be stable through rough seas. The VS 5 was built in Germany during World War II.
Yakovlev M-501 and Zvezda M503 and M504 Diesel Engines - One of the largest aircraft engines ever built, the 42-cylinder Yakovlev M-501 was modified into the Zvezda M503 marine engine. A further redesign created the 56-cylinder Zvezda M504.