nelitahtista

Nelitahtista refers to a four-stroke piston internal-combustion engine, in which one operating cycle is completed over two crankshaft revolutions. The cycle consists of four strokes: intake (air or air-fuel mixture enters the cylinder), compression (gas is compressed), power (ignition and combustion push the piston downward), and exhaust (burnt gases are expelled). This arrangement is commonly described as the Otto cycle in spark-ignition engines.

Historically, four-stroke engines were developed in the late 19th century and became the dominant design for automobiles and many other applications. Nikolaus Otto and collaborators played a key role in commercializing the four-stroke concept, which led to widespread adoption throughout the automotive industry and beyond.

A typical nelitahtinen engine includes a cylinder with intake and exhaust valves operated by a camshaft, a piston connected to a crankshaft, and a lubrication system. Modern versions may use fuel injection and electronic controls, replacing earlier carburetion systems. The engine generally requires separate lubrication for moving parts and uses a timing mechanism to coordinate valve operation.

Common applications include cars, motorcycles, lawn and garden equipment, outboard motors, generators, and other machinery requiring reliable, efficient power. Compared with two-stroke designs, four-stroke engines offer better fuel efficiency, lower emissions per unit of power, and smoother operation, but tend to be heavier and more mechanically complex.

Maintenance considerations include regular oil changes, valve clearance checks, spark plug replacement in gasoline engines, and timing belt or chain maintenance. Nelitahtista engines remain a foundational technology in modern internal combustion powertrains.