Straight-14 engine

A straight-14 engine or inline-14 engine is a fourteen-cylinder internal combustion engine with all fourteen cylinders mounted in a straight line along the crankcase. A straight-14 is a very long engine, and therefore only suitable for marine installations in large ships.

The only engine of this type known to have been built is a member of the Wärtsilä-Sulzer RTA96-C family. It is the world's most powerful combustion engine and is mounted in Emma Mærsk, the world's largest container ship. It is of two-stroke diesel engine configuration. The engine became well known due to photos taken at the Aioi Works in Japan, which subsequently spread through blogs.

The 14-cylinder version of this modular engine displaces 1,556,000 cubic inches (25,500 L), with a 38 inches (965 mm) cylinder bore and 98 in (2,489 mm) piston stroke. The engine is 89 feet (27.1 m) long, 44 ft (13.4 m) high, and weighs 2,300 tonnes (2,264 long tons; 2,535 short tons).

If built, the 14-cylinder variant of the MAN B&W K108ME-C would be even larger at nearly 33 metres (108 ft) long, and over 2,800 tonnes (2,800 long tons; 3,100 short tons), and more powerful at 97,300 kilowatts (130,500 hp).