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Many modern four-stroke medium speed diesel engines have a maximum operating speed of around 500 rpm. High speed: any engine with a maximum operating speed above 1000 rpm. 4-Stroke Marine Diesel Engine System. Most modern larger merchant ships use either slow speed, two stroke, crosshead engines, or medium speed, four stroke, trunk engines.
The ALCO 251 is a 4-stroke diesel engine that was developed by the American Locomotive Company to replace its 244 and 539 engines. The 251 was developed to be used in diesel locomotives, as a marine power plant in ships, and as a stationary power generator.
Since then, the development of four-stroke engines has been carried out in Augsburg, while two-stroke engines are designed in Copenhagen. [11] The marketing name for the largest two-stroke engines still has "B&W" in it. [14] [15] In 1982, the first two-stroke large diesel engine with over 50% efficiency was built. [11]
The electronically controlled line of ME diesel two-stroke engines was added in 2002 with a maximum cylinder bore of 108 cm. MAN B&W Diesel, Denmark, employed approximately 2,200 at the end of 2003 and had 100 GW, or more than 8000 MC engines, in service or on order by 2004.
The H-engine was initially designed for use as a 6,300 hp (4,700 kW) 16 cylinder, the EMD SD90MAC; however, the early engines were found to be unreliable, and unsuccessful in the market, with the proven EMD 710 2-stroke design being preferred. The EMD four-stroke engine was resurrected in 2015 to meet EPA Tier 4 emissions regulations.
A Yanmar 2GM20 marine diesel engine, installed in a sailboat. The center pulley is the crankshaft, the lower left one the seawater pump, the upper right one the alternator. The Yanmar 2GM20 is a series of inboard marine diesel engines manufactured by the Japanese company Yanmar Co. Ltd. It is used in a wide range of sailboats and motorboats.
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