Which component turns at the same speed as the crankshaft in a two-cycle engine?

In a two-cycle engine, the component that turns at the same speed as the crankshaft is the camshaft. This is because in many designs of two-cycle engines, the camshaft is directly connected to the crankshaft, often with a one-to-one ratio, allowing both to rotate synchronously. This synchronization is crucial, as it ensures that the timing of the valve openings aligns with the engine's power cycle.

In contrast, the oil pump, water pump, and fuel pump typically operate at different rates, governed by various factors such as engine design, load conditions, and specific functions unrelated to the direct rotational speed of the crankshaft. The oil pump is often driven by the crankshaft but may not turn at the same ratio at all times, depending on the specific design. The water pump and fuel pump also generally have their own drive mechanisms or ratios that can change based on the engine’s operating conditions. Thus, the camshaft provides a consistent reference point as it remains directly driven by the crankshaft’s motion.