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Internal combustion engine 4 stroke cycle10/29/2023 Just before the piston reaches its top dead center, fuel is injected into the combustion chamber, which is mixed, vaporized, and ignited, causing expansion. The piston thus travels from its lower dead center back to its upper dead center while its upward movement compresses the air, which heats up as a result but also increases its pressure. CompressionĪfter the piston reaches its bottom dead center and the intake phase ends, it begins to move upwards. This makes the necessary amount of air enter the cylinders through the intake pipe. The piston moves from its top dead center downwards to its bottom dead center, increasing the space above the piston and opening the intake valves. After being compressed and heated, diesel fuel is injected, and the resulting mixture is ignited by compression heat. The main difference is that only clean air is drawn into the cylinders. The principle of operation of a four-stroke diesel engine is very similar to the operation of a four-stroke petrol engine. Animated scheme of a four stroke internal combustion engine, Otto principle by Zephyris, license: Creative Commons CC BY-SA 3.
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