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four-stroke-cycle engine click to hear : four-stroke-cycle engine

Combustion engine whose cycle (intake, compression, combustion, exhaust) requires two up-and-down movements of the piston.
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exhaust burned gases exhaust valve piston combustion explosion intake cylinder air/fuel mixture intake valve compression spark crankshaft connecting rod

exhaust click to hear : exhaust

Phase during which the exhaust valve opens and the piston moves back up to expel the burned gases.

burned gases click to hear : burned gases

Mixture of gases (carbon monoxide, nitrogen oxide and unburned hydrocarbons) filling the combustion chamber after the explosion.

exhaust valve click to hear : exhaust valve

Part that opens to allow the burned gases to escape.

piston click to hear : piston

Metal moving part in the cylinder and attached to the connecting rod; it compresses the air/fuel mixture, then receives the thrust from the burned gases.

combustion click to hear : combustion

Phase during which the expansion of the combustion gases pushes the piston downward, driving the rotation of the crankshaft.

explosion click to hear : explosion

Ignition of the air/fuel mixture produces a major energy release that pushes the piston downward.

intake click to hear : intake

Phase during which the exhaust valve opens and the piston comes down and draws the air/fuel mixture into the combustion chamber.

cylinder click to hear : cylinder

Chamber closed by two valves; in it, the piston moves and the air/fuel mixture is burned.

air/fuel mixture click to hear : air/fuel mixture

Mixture prepared in the carburetor, containing an amount of fuel proportional to the amount of air entering.

intake valve click to hear : intake valve

Part that opens to let the air/fuel mixture into the cylinder.

compression click to hear : compression

Phase during which the piston goes up to compress the air/fuel mixture. At the height of the compression, the spark plug produces a spark.

spark click to hear : spark

Spark produced when an electric current arcs between the two electrodes of a spark plug and ignites the air/fuel mixture.

crankshaft click to hear : crankshaft

Shaft consisting of a series of cranks, which convert the alternate rectilinear motion of the piston/connecting rod assembly into a continuous circular motion.

connecting rod click to hear : connecting rod

Articulated shank powered by the gas explosion; it transmits the thrust from the piston to the crankshaft.