Kakstaktilised

Kakstaktilised refers to a type of internal combustion engine. These engines operate on a two-stroke cycle, meaning they complete their power cycle in just two piston strokes and one crankshaft revolution. This contrasts with four-stroke engines, which require four strokes and two revolutions. The two strokes in a two-stroke engine are typically the compression stroke and the power stroke, which are combined with the intake and exhaust processes.

In a two-stroke engine, as the piston moves upwards, it compresses the fuel-air mixture in the combustion chamber above it. Simultaneously, a fresh fuel-air mixture is drawn into the crankcase below the piston. As the piston reaches the top of its stroke, the spark plug ignites the compressed mixture, driving the piston downwards. This downward movement not only generates power but also compresses the mixture in the crankcase. As the piston moves down, it uncovers exhaust ports, allowing burned gases to escape, and then intake ports, allowing the compressed fuel-air mixture from the crankcase to enter the cylinder, initiating the next cycle.

Two-stroke engines are known for their simplicity, lighter weight, and higher power-to-weight ratio compared to four-stroke engines of similar displacement. They often have fewer moving parts, which can make them less expensive to manufacture and easier to maintain. However, they typically have poorer fuel efficiency, higher emissions due to incomplete combustion and the scavenging process, and can be noisier than four-stroke engines. They are commonly found in smaller applications such as motorcycles, scooters, chainsaws, leaf blowers, and some outboard boat motors.