What is the alternate name for the power stroke in the engine cycle?

The term "expansion stroke" refers to the power stroke in an engine cycle because it describes the phase in which the combustion gases expand and drive the piston down. During this stroke, the fuel-air mixture is ignited in the combustion chamber, causing an increase in pressure that forces the piston downward, thereby converting the thermal energy from combustion into mechanical energy.

This phase is integral to the functioning of an internal combustion engine, as it generates the power necessary to drive the crankshaft and ultimately propel the vehicle. Understanding this function is crucial for technicians, as it relates directly to engine efficiency and performance.

The other terms refer to different parts of the engine cycle: the compression stroke involves compressing the fuel-air mixture before ignition, and the intake stroke is when the mixture is drawn into the cylinder. The power stroke is often referred to simply as the power stroke, and expansion stroke is another name that captures its essence movement and power generation, making it a valid alternate term in this context.