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Chapter 7: Compression Ignition Engines

Introduction. Initial CI engines were large and slow.Heavy distillate petroleum was forced into the cylinder using compressed air.Robert Bosch began producing injection systems in 1927. . CI vs. SI Engines. SI engines draw fuel and air into the cylinder.Fuel must be injected into the cylinder at

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Chapter 7: Compression Ignition Engines

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    1. Chapter 7: Compression Ignition Engines BAE 599 - Lecture 7

    2. Introduction Initial CI engines were large and slow. Heavy distillate petroleum was forced into the cylinder using compressed air. Robert Bosch began producing injection systems in 1927.

    3. CI vs. SI Engines SI engines draw fuel and air into the cylinder. Fuel must be injected into the cylinder at the desired time of combustion in CI engines. Air intake is throttled to the SI engine -- no throttling in CI engines. Compression ratios must be high enough to cause auto-ignition in CI engines. Upper compression ratio in SI engines is limited by the auto-ignition temperature.

    4. CI vs. SI Engines Flame front in SI engines smooth and controlled. CI combustion is rapid and uncontrolled at the beginning.

    5. Table 7.1: Comparison of SI and CI Engines

    6. Fig. 7.1: Typical Brake Thermal Efficiencies of CI and SI Engines

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