BDC Cylinder

ENGINES All scooters, mopeds, motorcycles and ATVs can be divided into two categories according to the type of engine – two stroke and four-stroke. Features of operation and maintenance of each model is largely conditioned by the type of engine. Four-stroke engine is located in the cylinder head, intake and exhaust valves, resulting from the cams of a camshaft, which in turn is rotated by a crankshaft usually through the chain of transmission. In the course of the piston down from TDC to BDC (stroke) the intake valve is opened and the fuel mixture of air and gasoline vapor, cooked in the carburetor, under the influence of vacuum supplied to the cylinder. Piston reaches BDC, the intake cluster pan closed, then the piston moves upward, compressing the mixture (compression stroke).

When the piston approaches the TDC spark plugs, screwed into the cylinder head, lights the mixture. The temperature and pressure of gases in closed volume of a cylinder and piston rise sharply under the influence of this pressure goes down, then rotate the crank through the crankshaft (stroke). Upon reaching the bottom of the piston in the cylinder pressure drops, open exhaust valve, and then the piston goes up again, forcing the exhaust gases in the exhaust pipe, muffler and into the atmosphere (release). When the piston reaches TDC, the exhaust valve closes, intake valve opens, and the whole cycle repeats. The working process is obtained consisting of four cycles, respectively, passing for four stroke or two turns of the crankshaft.

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