A gasoline engine is a heat engine that uses gasoline as fuel and converts chemical energy into mechanical energy through the principle of internal combustion. Its core categories include spark ignition (distinguished by ignition method) and two-stroke and four-stroke (distinguished by operating cycle). Four-stroke engines, with their higher fuel efficiency and lower emissions, have become the mainstream choice for automobiles, motorcycles, and small general-purpose power equipment. Furthermore, they are further categorized by valvetrain structure, including overhead camshaft (SOHC) and DOHC. Known for their high power density, rapid response, and mature and reliable technology, gasoline engines remain one of the most widely used power sources in transportation, garden machinery, and various portable generator sets, despite the trend toward electrification.
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