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A re-entrant type piston bowl is a design feature in internal combustion engines, particularly in diesel engines, where the piston has a bowl-shaped cavity that extends inward. This design promotes better turbulence and mixing of the fuel-air charge during combustion, enhancing efficiency and power output. The re-entrant shape helps to achieve more complete combustion, reducing emissions and improving engine performance. It is especially beneficial in modern engines that aim for higher efficiency and lower environmental impact.

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