Liquid fuel engines are a type of internal combustion engine that use liquid fuels, such as gasoline or diesel, to produce power. These engines work by mixing fuel with air, compressing the mixture, and igniting it to create a controlled explosion. This explosion pushes pistons, which ultimately turn the engine's crankshaft and generate mechanical energy. These engines are commonly found in vehicles like cars and trucks, as well as in various machinery. They are known for their efficiency and power output. Liquid fuel engines can be further categorized into two-stroke and four-stroke engines, each with distinct operational characteristics and applications.