1B340

1B340 is a type of aircraft engine developed by the Rolls-Royce company. It is a high-bypass turbofan engine, specifically designed for use on the Boeing 757 and 767 aircraft. The engine is known for its high thrust-to-weight ratio, which makes it an efficient choice for long-range commercial flights. It has a bypass ratio of 4.5:1, meaning that for every unit of air that passes through the engine core, four units bypass the core and are mixed with the exhaust gases. This design helps to reduce fuel consumption and noise levels. The 1B340 engine is also notable for its advanced technology features, including a variable area exhaust nozzle and a two-spool fan. It has a thrust rating of approximately 120,000 pounds-force (534 kN). The engine's development began in the late 1980s and it entered service in the early 1990s. It is still in production today, with the latest variant, the 1B340-301, offering improved performance and reduced emissions.