Every car with a manual transmission has a mechanical device called a flywheel.
Flywheels are heavy, balanced metal disks that store rotational energy.

Since heavy spinning objects have high inertia (that is, resistance to change in velocity), flywheels keep your engine running smoothly even when torque delivery is inconsistent or changes quickly, such as when you’re shifting gears.

Flywheels are usually only found in manual transmission vehicles.Flywheels on cars and trucks are attached to the back of the engine between the engine and transmission.
Flywheels provide an additional friction surface for the clutch and come with teeth that engage with the starter.
When you turn the key, the starter motor turns the flywheel, which spins the crankshaft and starts the engine.

It is important for a manual vehicle to have a flywheel for gear changes and clutch engagement.
Without a flywheel, the vehicle would likely stall when you engage the clutch to move the vehicle from a standstill.
This is because the engine speed would drop too fast without all the angular momentum the flywheel provides.

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