Large Diesel Engines
V12 is a common configuration for large diesel engines; most are available with differing numbers of cylinders in V configuration to offer a range of power ratings. Many diesel locomotives have V12 engines. Examples include the 3,200 hp (2.39 MW) 12-710 from Electro-Motive Diesel and the 4,400 hp (3.28 MW) GEVO-12 from GE Transportation.
Large V12 engines are also common in ships. For example Wärtsilä, offers V12 engines with various cylinder bore diameters between 26 and 50 centimetres (10 and 20 in) with power output ranging from 4,080 kW (5,470 hp) to 14,400 kW (19,300 hp). These engines are commonly used especially in cruise ships, which may have up to six such main engines. In the past the largest medium-speed diesel engine in the world, Wärtsilä 64, was also offered in V configuration, and a single 12V64 prototype with an output of 23,280 kW (31,220 hp) was produced for an experimental power plant in the late 1990s.
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