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Small high-swirl direct-injection CI engines have fuel conversion efficiencies which are about 10 percent higher than values...

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Mechanical Engineering

Small high-swirl direct-injection CI engines have fuelconversion efficiencies which are about 10 percent higher thanvalues typical of equivalent indirect-injection engines. (ID1engines are used because they achieve higher bmep.) Whatcombustion-system-related differences contribute to this higherefficiency?

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Comparison between Small highswirl Direct Injection CI engines and equivalent Indirect Injection engines Direct Injection CI engines has typically two design philosophies which help them to have higher fuel conversion efficiency 1 Highswirl design which have a deep bowl in the piston a low number of holes in the injector and moderate injection pressures 2 Lowswirl or quiescent engines are characterized by having a shallow bowl in the piston a large number of holes    See Answer
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