Flywheel: Description and Operation

Dual-mass Flywheel

The working cycles and ignition sequence of the engine result in speed fluctuations which induce torsional vibration throughout the drivetrain as a result of irregularities. These torsional vibrations can induce rattling or chattering in all loose parts subject to play which are not incorporated into the power flow (loose gearwheels, synchronization parts). This may lead to unpleasant noise, particularly at low engine speeds combined with high transmission oil temperatures. Similarly to previous Porsche vehicles, the new 911 Carrera and 911 Carrera S incorporate a dual-mass flywheel (DMF) to prevent such noise.