Fairbanks Morse PC2.5 STC engine

The Fairbanks Morse PC2.5 STC is a four-stroke medium-speed marine diesel engine sold by Fairbanks Morse Defense in 12, 14, 16 and 18 cylinder V arrangements. The maker's data sheet gives a bore of 400 millimetres and a stroke of 460 millimetres, a displacement of 57.8 litres per cylinder and an output of 485 kilowatts, or 650 horsepower, per cylinder at 520 revolutions a minute, so the complete engines span 5,816 to 8,725 kilowatts. It descends from the PC2 line of the French designer SEMT Pielstick, whose PC2.5 appeared in 1973, and Fairbanks Morse builds Pielstick designs in the United States under licence. The 16-cylinder version powers the US Navy San Antonio class of amphibious transport docks, each fitted with four engines. The maker presents it as well suited to marine use, with high torque at low speed and good power for its installed weight.