Which of the following is NOT one of the four strokes in a car engine cycle?

In an internal combustion engine, the four strokes of the cycle are intake, compression, power, and exhaust. Each of these strokes plays a critical role in the operation of the engine:

• The intake stroke is when the engine draws in an air-fuel mixture.

• The compression stroke is when that mixture is compressed in the cylinder to prepare it for ignition.

• The power stroke occurs when the compressed mixture is ignited, causing an explosion that drives the piston down, ultimately creating the power to turn the crankshaft.

The term "turnover" does not correspond to any of the recognized strokes in the cycle. Instead, it may refer more informally to the engine starting or rotating, but it does not represent a distinct cycle phase like the others. This distinction makes it clear why "turnover" is not considered one of the four essential strokes.