If the working fluid is treated as an ideal gas of constant specific heat, the efficiency of the cycle may be written in terms of the compression ratio, r, and the ratio: (C_p /C_v ) = g = 1.4 for air.
Efficiency = h = 1 - (1/ r^{g - 1} )

If the temperatures at various points in the cycle are known, the efficiency may be estimated as the fraction of the ideal Carnot efficiency for a heat engine working between these temperatures. Compare such a computation to your other measures of efficiency.

In addition to these efficiency computations it is important to understand how engine performance depends upon engine variables such as ignition timing, fuel/air ratio, fuel type, engine RPM, and throttle position.

Once you have determined these quantities, and any others that are appropriate to the use you decided on for the engine, discuss parameter changes that might improve its performance.