Which component stores energy to smooth engine operation and is connected to the crankshaft?

Which component stores energy to smooth engine operation and is connected to the crankshaft?

• A. Piston
• B. Flywheel
• C. Camshaft
• D. Crankcase

Answer: (B)

The flywheel is the component that stores energy to smooth engine operation and is connected to the crankshaft. It’s a heavy wheel bolted directly to the end of the crankshaft, so it shares the crankshaft’s rotation. During each combustion cycle, torque rises and falls, which would cause big speed fluctuations if the engine leaned only on immediate torque. The flywheel’s rotational inertia resists these speed changes, absorbing excess energy when torque is high and releasing it when torque is low. This keeps the crankshaft turning more steadily, reduces vibrations, and helps the engine run smoothly at idle and during gear changes. In manual transmission setups, the flywheel also provides the friction surface for the clutch and may carry the ring gear used by the starter motor to crank the engine. The other parts don’t store usable energy in this way: a piston converts energy to motion, the camshaft controls valve timing, and the crankcase houses oil and supports components.

The flywheel is the component that stores energy to smooth engine operation and is connected to the crankshaft. It’s a heavy wheel bolted directly to the end of the crankshaft, so it shares the crankshaft’s rotation.

During each combustion cycle, torque rises and falls, which would cause big speed fluctuations if the engine leaned only on immediate torque. The flywheel’s rotational inertia resists these speed changes, absorbing excess energy when torque is high and releasing it when torque is low. This keeps the crankshaft turning more steadily, reduces vibrations, and helps the engine run smoothly at idle and during gear changes. In manual transmission setups, the flywheel also provides the friction surface for the clutch and may carry the ring gear used by the starter motor to crank the engine. The other parts don’t store usable energy in this way: a piston converts energy to motion, the camshaft controls valve timing, and the crankcase houses oil and supports components.