What does the crankshaft do in a four-stroke engine?

In a four-stroke engine, the crankshaft plays a crucial role by converting the reciprocating (up-and-down) motion of the piston into rotary motion. This is essential for the overall functionality of the engine, as it allows the energy generated from combustion to be transferred to the drivetrain, ultimately propelling the vehicle or powering the equipment.

During the four-stroke cycle—comprising the intake, compression, power, and exhaust strokes—the piston moves within the cylinder in a straight line. The crankshaft is connected to the piston via a connecting rod. As the piston moves down during the power stroke (caused by the combustion of the fuel-air mixture), the crankshaft rotates. This rotation is what allows the engine to produce useful mechanical energy.

The crankshaft's design includes offset throws that convert the linear motion of the pistons into a uniform circular motion, enabling continuous operation of the engine. This conversion is fundamental to the operation of any internal combustion engine and is key to its ability to function efficiently.

Other options do not accurately describe the function of the crankshaft. For example, regulating fuel flow pertains more to the fuel system of the engine rather than the mechanical motion involved in powering it. Additionally, spark plugs are components responsible for igniting