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A two-stroke engine is a type of internal combustion engine with a cycle of only two (power) strokes.
internal combustion engine, two-stroke engine, engine, heat engine, cylinders, driven shaft, engine block, cylinder head, intake manifold, exhaust manifold, crankshaft, piston, spark plug, cylinder, intake, compression, carburetor, power stroke, lubricating oil, cycle, mixture, trabant, thermodynamics, physics
We know that cars are powered by engines, but how does this work? The rotating motion of an engine’s crankshaft is transmitted to the wheels by the drive shaft. The gearbox changes the number of rotations of the wheels during one turn of the crankshaft. In low gear the output of the engine is high, but the speed is low; in high gear, the car is faster and uses less fuel but accelerates more slowly.
Cars in the past were often equipped with two-stroke engines, but today four-stroke engines have generally marginalized them. The fuel used in two-stroke engines is petrol mixed with lubricating oil. The function of lubricating oil is to reduce the friction of the cylinders and the valves.
The alternating vertical motion of the piston is converted into the rotation of the crankshaft, which drives the drive shaft and the camshaft by means of the timing belt. The camshaft operates the valves, which ensure fuel intake and the emission of exhaust gases through a coordinated, rhythmic opening and closing.
During the first stroke in the operation of two-stroke engines, the piston moves upwards, decreasing the pressure underneath. The intake valve opens and a mixture of air, fuel and lubricating oil flows from the carburetor into the cylinder. The piston compresses the mixture, thereby increasing the temperature.
During the second stroke the spark plug ignites the hot mixture. The explosion pushes the piston downwards in the cylinder, and the high-pressure combustion products are emitted through the exhaust port. The pressure under the piston increases, forcing the mixture into the cylinder through the transfer port.
As you can see, the linear motion of the piston is converted into the rotating motion of the crankshaft in the engine. The energy necessary to move the piston is provided by the combustion of fuel.
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