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What is Four-Stroke Engine

What is Four-Stroke Engine

This article tells about the 4 strokes that a car engine makes, intake stroke, compression stroke, working stroke, exhaust stroke and describes what happens during these strokes. it also describes what happens to these forces.

The four-stroke process

Intake stroke: during the intake stroke, the inlet valve above the piston opens, sucking in a mixture of gasoline and air. the ratio between the gasoline and air is 1: 14.8. this can vary and slightly depending on the operating conditions of the engine. For example, a ratio of 1:20 is possible when driving quietly, but at a cold start the ratio may be 1: 9. the piston will draw this mixture in because a vacuum is created above the piston.

Compression stroke: during this stroke all valves are closed, the piston rises, compressing the sucked-in mixture. this increases the temperature in the cylinder, this temperature is necessary to evaporate the fuel

 power stroke: during the power stroke all valves are closed and the piston descends. the compressed mixture is ignited by a spark, creating an explosion that pushes the piston downwards. this is the only stroke that produces energy.

exhaust stroke: during the exhaust stroke the exhaust valve is open. the piston rises again pushing the burnt mixture out. this mixture is very hot (800 degrees)

after these 4 strokes a work cycle has been completed. in this cycle, 4 turns have been completed, this obviously involved 2 revolutions of the crankshaft. now you have to imagine that at a speed of 2000 revolutions per minute there has been a work cycle 1000 times in a minute. this of course releases enormous forces. these forces are converted into heat, mechanical energy and friction.

Because the pistons go up and down so quickly, a crankshaft is driven. This crankshaft ensures that the up and down movement of the pistons is converted into a rotating movement with which the wheels can be driven. There is a flywheel on the crankshaft that ensures that the engine runs smoothly at all times and works with low vibration. When the engine is started, an electric motor engages in the gear ring on the flywheel to drive it.

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