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The most widely used four-stroke internal combustion engines, in which the full cycle in the cylinder is carried out in four stroke up and down. First, the cylinder is filled with a combustible mixture through the inlet valve (intake stroke), then compresses the working mixture (the compression stroke), then it is ignited by an electric spark from the spark plug (stroke), and finally, the combustion products are expelled from the cylinder through the exhaust valve (measure release). Working mixture is prepared outside the engine cylinder in a special device called a carburetor. The combustion gases having a high temperature, expand, putting pressure on the piston and force it to move down the cylinder (ie. E. The travel takes place). Moving through the piston rod transmits the force to the crankshaft, causing it to rotate. Thus, a reciprocating (linear) movement of the piston is converted into rotary motion of the crankshaft.
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