The BMW 328i Flywheel is basically a spinning energy bank for the car. It absorbs energy to keep the same speed when shifting gears and also releases it to let the starter spin the motor. The Flywheel is installed on the crankshaft in front of the clutch disc. It has a large moment of inertia, so it resists sudden drops in rpm. The driver therefore has smoother takeoffs and fewer jerks during the shifts. In conventional steel construction, there is also a toothed ring that engages the starter pinion and turns the stored kinetic energy into the first rotations that awaken the engine. The earlier 328i models featured a single-mass Flywheel designed for durability. However, many later variants switched to a dual-mass style with the addition of an internal spring system to eliminate vibration in the engine to transmission unit. Whereas the single mass type seems more direct and provides some leeway in aggressive driving, it also amplifies noise. Conversely, the dual mass type makes for a quieter and refined behavior. However, it does so at the expense of added weight and complexity. Because of either normal wear, like heat spots or surface cracks, or if a 328i has frequent hard launches, BMW owners may end up having to replace a Flywheel. Routine inspections safeguard the harmony of the Flywheel parts that let a BMW stay smooth at every rev.
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