A piston engine, also known as a reciprocating engine, works by expanding hot gases (a mixture of air and fuel) within a cylinder in order to push a piston, which in turn rotates a crankshaft and generates power. Unlike early steam engines, modern piston engines do not require an external source of hot gases, hence they are known as internal combustion engines.Know More
The movement of the piston is called a stroke. Piston engines are categorized by the number of strokes required to complete one power cycle, as well as the speed of the crankshaft (revolutions per minute, or rpm). The four-stroke engine, for instance, requires four movements of the piston before the sequence of firing the engine repeats.
There are two types of piston engine that employ internal combustion: 'spark-ignited' (or SG) and compression-ignited (diesel).
In spark-ignited piston engines, the air-fuel mixture is injected via a spark plug at the top of the cylinder. This is based on the Otto cycle, in which the fuel requires an internal spark in order to reach the required temperature to burn.
Conversely, the diesel cycle, which is employed by compression-ignited piston engines, raises temperature by compressing air. When the fuel is introduced to the cylinder, the temperature is already hot enough for it to burn, with the expansion forcing the piston down.Learn more about Engine
A pneumatic cylinder works by forcing air or gas into a cylinder, which moves a piston after a certain pressure is achieved. The piston is attached to another mechanism that performs the desired function of the machine.Full Answer >
Rotax engines work by maintaining complete control of the airflow into an engine and keeping the air in without any airflow restrictions, according to Rotaxdisk.com. They have a rotary valve that rotates mechanically in a circular motion, which maintains an efficient intake air control.Full Answer >
A four-stroke engine uses the four-stroke combustion cycle, which converts fuel, in most cases gasoline, into movement and energy. The four-stroke combustion cycle is made up of the intake stroke, the compression stroke, the combustion stroke and the exhaust stroke. The combustion cycle is generated through the movement of a piston connected by a rod to a crankshaft. With every revolution of the crankshaft, the combustion cycle is started.Full Answer >
A choke is a valve installed in a carburetor that restricts air flow, which enriches the fuel-air mixture when an engine is started. According to Autorized.com, a choke is designed to help engines start more quickly and efficiently when they are cold.Full Answer >