Large engines are powerful machines designed to convert fuel into mechanical energy. They are commonly found in vehicles like trucks, ships, and airplanes, where significant power is needed to move heavy loads or travel long distances. These engines can be powered by various fuels, including diesel and jet fuel, and often feature multiple cylinders to enhance performance. The design of large engines typically includes components such as pistons, crankshafts, and valves, which work together to create motion. Their size and complexity allow them to generate high levels of torque and horsepower, making them essential for industrial applications and transportation.