What are the sequential events that occur within an engine?

The correct sequence of events that occurs within an engine is intake, compression, ignition, power, and exhaust. This sequence is crucial for understanding the four-stroke combustion cycle commonly used in internal combustion engines.

During the intake phase, the engine draws in an air-fuel mixture through the intake valve. This is followed by the compression phase, where the piston moves upward in the cylinder, compressing this mixture, which increases its temperature and pressure, making it more volatile. The ignition phase occurs when the compressed mixture is ignited by a spark from the spark plug, causing a rapid expansion of gases. This explosion generates power, pushing the piston down during the power stroke. Finally, during the exhaust phase, the spent gases are expelled from the cylinder as the piston moves back up and the exhaust valve opens.

Understanding these stages is essential for grasping how an engine operates efficiently, as each step plays a significant role in the overall performance and efficiency of the engine.