To approximate an actual spark-ignition engine, consider an air-standard Otto cycle that has a heat addition of 1800 kJ/kg of air, a compression ratio

of 7, and a pressure and temperature at the beginning of the compression process of 90 kPa, 10◦C. Assuming constant specific heat, with the value from Table A.5, determine the maximum pressure and temperature of the cycle, the thermal efficiency of the cycle, and the mean effective pressure.

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Spark plug Inlet valve Cylinder Air-fuel mixture Coolant flow FIGURE P10.73