Guide to Auto Engine Parts

Read this guide to auto engine parts, as an engine configuration is discussed for the details they work. The most popular engine is the four-stroke engine. See how the engine cycle works and what parts are involved in the process.

Each of the four strokes occurs every two engine revolutions. These engine parts and strokes are common in most auto engines.

First Stroke: Intake
Starting with the first cycle, a piston moves down from the top of a cylinder and extends down to the bottom.

Second Stroke: Compression
Understanding that the piston moves back to the top of the cylinder and then compresses fuel and air.

Third Stroke: Power
The spark plug ignites the air-fuel mixture. Ignition moves the piston down, creating power.

Fourth Stroke: Exhaust
The exhaust valve vents and allows the cylinder to move back to the top and repeat the action.

Common Auto Engine Parts:

• Spark plug - Ignition electrical device that is inserted into the cylinder head.


• Valves - Devices that open/close to direct passageways.


• Piston - Transfers the force of a cylinder to the connecting rod and then to the crankshaft.


• Piston rings - Seal the piston in the cylinder and forms a gas-tight seal.


• Connecting rod - Connects the piston to the crankshaft and is responsible for the transfer of power from the cylinder to the crankshaft.


• Crankshaft - Sometimes referred to as the crank, the crankshaft is the part which translates piston motion into rotation.


• Sump - The sump encases the crankshaft. It contains some amount of oil which lays in the oil pan.