ANSWERS: 2
  • Intake, compression, combustion, exhaust. All four cycles are really necessary for internal combustion to take place. They are derivative of the process. The 2-cycle engine blows my mind.
  • The 4 stroke is simply logical. The 2 stroke is a neat feat with details in the timing. At resonance a 2 stroke can even get some compression before the valves close. . Another neat trick is the pulse detonation engine. some prototypes run without valves. They have no pistons.

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