query: subclass_of two-stroke engine
supports: A reciprocating compressor or piston compressor is a positive-displacement compressor that uses pistons driven by a crankshaft to deliver gases at high pressure. A piston ring is a split ring that fits into a groove on the outer diameter of a piston in a reciprocating engine such as an internal combustion engine or steam engine. A gas compressor is a mechanical device that increases the pressure of a gas by reducing its volume. An air compressor is a specific type of gas compressor. FLUID (Fast Light User Interface Designer) is a graphical editor and GUI builder that is used to produce FLTK source code. FLUID edits and saves its state in text .fl files, which can be edited in a text editor for finer control over display and behavior. In a reciprocating engine, the crankpins, also known as crank journals are the journals of the big end bearings, at the ends of the connecting rods opposite to the pistons. In a piston engine, a piston rod joins a piston to the crosshead and thus to the connecting rod that drives the crankshaft or (for steam locomotives) the driving wheels. A two - stroke , or two - cycle , engine is a type of internal combustion engine which completes a power cycle with two strokes ( up and down movements ) of the piston during only one crankshaft revolution . This is in contrast to a `` four - stroke engine '' , which requires four strokes of the piston to complete a power cycle . In a two - stroke engine , the end of the combustion stroke and the beginning of the compression stroke happen simultaneously , with the intake and exhaust ( or scavenging ) functions occurring at the same time . Two - stroke engines often have a high power - to - weight ratio , usually in a narrow range of rotational speeds called the `` power band '' . Compared to four - stroke engines , two - stroke engines have a greatly reduced number of moving parts , and so can be more compact and significantly lighter . The first commercial two - stroke engine involving in - cylinder compression is attributed to Scottish engineer Dugald Clerk , who patented his design in 1881 . However , unlike most later two - stroke engines , his had a separate charging cylinder . The crankcase - scavenged engine , employing the area below the piston as a charging pump , is generally credited to Englishman Joseph Day . The first truly practical two - stroke engine is attributed to Yorkshireman Alfred Angas Scott , who started producing twin - cylinder water - cooled motorcycles in 1908 . Gasoline ( spark ignition ) versions are particularly useful in lightweight or portable applications such as chainsaws and motorcycles . Despite that , they are also used in diesel compression ignition engines operating in large , weight - insensitive applications , such as marine propulsion , railway locomotives and electricity generation . In a two - stroke engine , the heat transfer from the engine to the cooling system is less than in a four - stroke , which means that two - stroke engines can be more efficient . However , crankcase - compression two - stroke engines , such as the common small gasoline - powered engines , create more exhaust emissions than four - stroke engines because their petroil lubrication mixture is also burned in the engine , due to the engine 's total - loss oiling system . Pneumatic cylinder(s) (sometimes known as air cylinders) are mechanical devices which use the power of compressed gas to produce a force in a reciprocating linear motion. A valve is a device that regulates, directs or controls the flow of a fluid (gases, liquids, fluidized solids, or slurries) by opening, closing, or partially obstructing various passageways. Valves are technically fittings, but are usually discussed as a separate category. In an open valve, fluid flows in a direction from higher pressure to lower pressure. The word is derived from the Latin "valva", the moving part of a door, in turn from "volvere", to turn, roll. A piston is a component of reciprocating engines, reciprocating pumps, gas compressors and pneumatic cylinders, among other similar mechanisms. It is the moving component that is contained by a cylinder and is made gas-tight by piston rings. In an engine, its purpose is to transfer force from expanding gas in the cylinder to the crankshaft via a piston rod and/or connecting rod. In a pump, the function is reversed and force is transferred from the crankshaft to the piston for the purpose of compressing or ejecting the fluid in the cylinder. In some engines, the piston also acts as a valve by covering and uncovering ports in the cylinder wall. The petrol enters inside the cylinder and the piston moves upwards and the spark plug produces spark and the petrol is set on fire and it produces an energy that pushes the piston downwards. A four-stroke engine (also known as four cycle) is an internal combustion (IC) engine in which the piston completes four separate strokes while turning a crankshaft. A stroke refers to the full travel of the piston along the cylinder, in either direction. The four separate strokes are termed: In a reciprocating piston engine, the connecting rod or conrod connects the piston to the crank or crankshaft. Together with the crank, they form a simple mechanism that converts reciprocating motion into rotating motion. Reciprocating motion, also called reciprocation, is a repetitive up-and-down or back-and-forth linear motion. It is found in a wide range of mechanisms, including reciprocating engines and pumps. The two opposite motions that comprise a single reciprocation cycle are called strokes.  A pump is a device that moves fluids (liquids or gases), or sometimes slurries, by mechanical action. Pumps can be classified into three major groups according to the method they use to move the fluid: "direct lift", "displacement", and "gravity" pumps. A crankshaftrelated to "crank"is a mechanical part able to perform a conversion between reciprocating motion and rotational motion. In a reciprocating engine, it translates reciprocating motion of the piston into rotational motion; whereas in a reciprocating compressor, it converts the rotational motion into reciprocating motion. In order to do the conversion between two motions, the crankshaft has "crank throws" or "crankpins", additional bearing surfaces whose axis is offset from that of the crank, to which the "big ends" of the connecting rods from each cylinder attach. Gas is one of the four fundamental states of matter (the others being solid, liquid, and plasma). A pure gas may be made up of individual atoms (e.g. a noble gas like neon), elemental molecules made from one type of atom (e.g. oxygen), or compound molecules made from a variety of atoms (e.g. carbon dioxide). A gas mixture would contain a variety of pure gases much like the air. What distinguishes a gas from liquids and solids is the vast separation of the individual gas particles. This separation usually makes a colorless gas invisible to the human observer. The interaction of gas particles in the presence of electric and gravitational fields are considered negligible as indicated by the constant velocity vectors in the image. One type of commonly known gas is steam. A reciprocating engine, also often known as a piston engine, is a heat engine (usually, although there are also pneumatic and hydraulic reciprocating engines) that uses one or more reciprocating pistons to convert pressure into a rotating motion. This article describes the common features of all types. The main types are: the internal combustion engine, used extensively in motor vehicles; the steam engine, the mainstay of the Industrial Revolution; and the niche application Stirling engine. Internal Combustion engines are further classified in two ways: either a spark-ignition (SI) engine, where the spark plug initiates the combustion; or a compression-ignition (CI) engine, where the air within the cylinder is compressed, thus heating it, so that the heated air ignites fuel that is injected then or earlier.
candidates: action air compressor application behavior carbon code combustion engine cycle designer device diameter editor energy engine fluid force gas gravity heat image interaction internal combustion engine light liquid matter mechanism method motion neon observer order part plasma power pressure pump range reciprocating engine revolution ring state steam engine stroke transfer travel user interface valve via volume
answer: reciprocating engine