What would be the Otto cycle efficiency in Example 6.1 if the engine’s compression ratio was 10.0?

Example 6.1

A new four-cylinder Otto cycle engine has a total displacement of 5000. cm³ and a compression ratio of 9.00. Its fuel has a heating value of 45,500 kJ/kg and it has a mass air-to-fuel ratio of 15.0. During a test, the actual power delivered by the engine was 65. kW at 4000. RPM. The air density at the engine was 1.10 kg/m3. Determine (1) the engine’s Otto cycle efficiency, (2) the engine’s ideal power, and (3) its mechanical efficiency.

Need: (1) η_Otto, (2) ideal power produced, and (3) η_Mech for this engine.

Know–How: Equations (6.1), (6.2), and (6.3) give the desired results.