Internal-Combustion Engine is any type of machine that obtains mechanical energy directly from the expenditure of the chemical energy of fuel burned in a combustion chamber that is an integral part of the engine. Four principal types of internal-combustion engines are in general use: the petrol engine, the diesel engine, the rotary engine, and the gas turbine. The Diesel engine operates on a different principle and usually uses oil as a fuel. It is employed …
showed first 75 words of 417 total

showed last 75 words of 417 total
…or sleeve valves. The valves are normally held closed by the pressure of springs and are opened at the proper time during the operating cycle by cams on a rotating camshaft that is geared to the crankshaft (see CAM). By the 1980s more sophisticated fuel-injection systems, also used in diesel engines, had largely replaced this traditional method of supplying the proper mix of air and fuel; computer-controlled monitoring systems improved fuel economy and reduced pollution.