P 3 T 3 1080 psi T 3 T 3 = p 2 T 2 = 369.4 R = 3967. A four stroke engine requires four strokes to complete one combustion cycle. The rotary engine approach as a competitive alternative is. Cycle analyses for spark-ignition and compression-ignition piston engine variants are presented in this chapter. For the calculation we will use the given compression ratio V 1 / V 2 = 10 V_1/V_2=10 V 1 / V 2 = 10, constant k = 1.4 k=1.4 k = 1.4, temperature T 1 = 540 R T_1=540\,\text \\ Internal combustion engines can fill the role of rotating a propeller or main rotor, being the baseline powerplant approach from the early days of powered flight. To solve this problem we will first use the given data to calculate the temperature at each point of the process.