As rightly said, basic engine operation can be divided into four stages. These stages, listed in the proper order, are as follows:
1. I<span>ntake 2. Compression 3. Power 4. Exhaust
This is known as the Otto Cycle (otherwise called the Four Stroke Cycle). Typically, only </span>one rotation of the engine crankshaft is required for t<span>he </span>intake<span> stroke and </span>compression<span> stroke, and another rotation is required for the </span>power<span> stroke and </span>exhaust<span> stroke.</span>
The answer would be: Intake, Compression, Power, and Exhaust.
<span>Intake: also known as induction or suction. Compression: starts at the end of the suction stroke, and ends at T.D.C. <span>Power: also known as combustion. This is the start of the second revolution of the four stroke cycle. </span><span>Exhaust: also known as outlet. In here, the piston once again returns from B.D.C. to T.D.C. while the exhaust valve is open. This action eliminates the spent air-fuel mixture through the exhaust valve.</span></span>
