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Engines Engines are found all around our very day lives They are found in our cars trucks vans and motorcycles Almost all vehicles run on the basic combustion engine An internal- combustion engine is any type of machine that gets mechanical energy from the expenditure of the chemical energy of fuel burned in a combustion chamber There are four main types of internal- combustion engines they are the Otto - cycle engine the diesel engine the rotary engine and the gas turbine The Otto-cycle engine is usually used in gasoline engines found in cars and airplanes The diesel engine runs on a different principle and mainly uses oil as fuel It is used in electric-generating and marine-power plants in trucks buses and some cars Both diesel and Otto-cycle engines are made in two-stroke and four-stroke cycle models The first piston engine was developed in 1690 by a French physicist and inventor Denis Papin and it was used for pumping water His first engine was a crude machine that used air It was a single cylindered engine that also was used as a boiler There was a small amount of water placed in the bottom of the cylinder and it was heated until steam was formed The pressure that was made from the steam made the piston rise fitting in the cylinder and after it was raised the heat was removed from the bottom of the cylinder As the cylinder cooled the steam condensed and the air pressure on the top of the piston pushed the piston down The main parts of an Otto-cycle engine and a diesel engine are the same Their combustion chamber has cylinders that are closed at one end and in which a close-fitting piston slides The outside of the piston is connected to a crankshaft by a connecting rod The crankshaft changes the motion of the pistons in a rotary motion Crankshafts have heavy flywheels and counterweights
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