An analysis of internal combustion engine cycles using thermodynamic charts usually involves a lengthy trial-and-error process. A graphical analysis of the results of many cycles, however, enables equations to be developed for theoretical mean effective pressure and efficiency of the Otto cycle in terms of intake and exhaust pressures, fuel-air ratio, compression ratio, and fresh charge temperature. These equations enable quick solution of a particular cycle and the effects of operating parameters on engine performance to be studied. Experimental results show similar relationships between engine performance and operating parameters to those obtained theoretically.

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