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A simplified, clear cross-sectional diagram showcasing the internal components and operational gas flow within a single-cylinder internal combustion engine. It distinctly illustrates the piston, crankshaft, connecting rod, and the intake and exhaust valve systems, along with the spark plug. Blue arrows represent the fresh air-fuel mixture entering the engine, while pink arrows depict the exhaust gases being expelled, providing a foundational visual explanation of how an engine breathes during its cycles.

engine - combustion - piston - cylinder - mechanics - diagram - automotive - exhaust - intake