The Detroit Diesel 149 is a series of two-stroke diesel engines manufactured by Detroit Diesel which were first announced in early 1966. After Detroit Diesel was spun off in 1988 and later acquired by MTU, production of Series 149 engines was discontinued around 2000. Development The first configuration was announced at the 50th anniversary SAE Tractor meeting. It was a naturally aspirated 12V149 rated at about soon followed by a naturally aspirated 16V149 rated at about . As manufacturers in the marine, construction, mining, and many other industries required more power output, Detroit added turbocharging and intercooling to the engine. As originally designed, the Oliver Hazard Perry-class frigates were equipped with 16V-149TI diesels for electrical generation, but these were replaced starting in 2000 after the Series 149 went out of production. In 1992, Republic Locomotive announced a new line of locomotives powered by Series 149 engines intended for switching and commuter service. Over a period of time, Detroit Diesel continued to further evolve the design of the engine. They finally brought the engine up to per cylinder and torque per cylinder; needless to say, this is a considerable amount of power coming from per cylinder. Much of this increase in power could be attributed to DDEC III (the third generation of Detroit Diesel Electronic Controls) electronics, thermal barrier (ceramic) coating of piston domes & fire deck, by-pass valve controlled blowers and Separate Circuit Charge Cooling (SCCC) system. Design One of the unique features of the 149 engine is its bore and stroke ; hence, it is known as a square bore design. It has a relatively high power-to-weight ratio. The 20V149 TIB DDEC III SCCC in stand-by generator spec has an output of from a capacity of . All Series 149 engines have overhead camshafts and the cylinder heads fit into the engine block; this is referred to as the "pothead" design. The blowers are also recessed into the block; this section of the block is called the "airbox". Above the blower is a thick piece of steel that covers the blower and seals the top section of the air box. On a turbocharged engine an intercooler and sometimes a by-pass housing is present with the intercooler housing. Nomenclature The engine is available in V-8, V-12, V-16, and V-20 configurations; using the alphanumeric nomenclature utilized by Detroit Diesel, these engines were known as the 8V149, 12V149, 16V149, and 20V149, respectively.