Flywheel: Description and Operation

1360 - Dual-mass Flywheel

The working cycles and ignition sequence of the engine result in speed fluctuations which induce torsional vibration throughout the drivetrain. These torsional vibrations can induce rattling, chattering or floating in all loose parts subject to play which are not incorporated into the power flux (loose gearwheels, synchronization parts). This may lead to unpleasant noise, particularly at low engine speeds combined with high transmission oil temperatures. Similar to previous Porsche vehicles, the Boxster (987) and the Boxster S (987) incorporate a dual-mass flywheel (DMF) to prevent such noise.