If you are wondering why we're mentioning flywheels, well following its introduction on the 1990 964 the Porsche 'dual mass' flywheel (Porsche DMF) was adopted as a standard fitment item on all of their volume production models. If you own a 964, 993, 986 & 987 Boxster or Cayman, 996, 997 or Cayenne (rare to find a manual Cayenne, but they are out there!) there will be a DMF fitted on the end of your engine.
For the uninitiated, the dual mass flywheel is a two piece assembly which damps or absorbs unwanted torque impulses and harmonic vibrations which naturally occur on the rotating assembly of the engine, as a result reducing the dynamic forces within the engine, hence reducing engine wear. The main reason for Porsche fitting a DMF was to improve driveability with a heavy flywheel and to damp out gear noise which would be audible with a conventional flywheel.
There are issues with the Porsche DMF for which we pay a price. The early 964 Porsche DMF was prone to failure but fortunately most of the cars affected with these problems will have had a new DMF fitted by now. The second issue is that the friction face of the DMF which is in contact with the clutch disc is prone to scoring and wear, hence it is highly likely that when you have a new clutch package fitted you will also need to have a new DMF installed with it. The final issue is that if the clutch/DMF assembly wears and runs out of balance it can cause severe engine damage by overloading the crankshaft main bearings. This problem is especially prevalent on the 986, 987, 996 & 997 2.5, 2.7, 3.2, 3.4, 3.6 & 3.8 models, For these reasons Ninemeister highly recommend replacing the Porsche DMF at the same time as a clutch replacement and will only warranty a clutch package when fitted with a new DMF.
On a lighter note, some of us are luckier than others. Since the Porsche DMF is a heavy old lump, to those of us who want a Sports Car to drive fast & perform well, can fitting a lightweight flywheel (LWF) be a better idea? In our view the answer is a resounding yes!
If you happen to own a 911, 964, 993, 996GT3 or 997GT3, all these cars are fitted with a derivative of the original 911 “Mezger” engine which will happily run the RS LWF package. For more information on this check out the Ninemeister Performance section of this site or give us a call, see below for contact details.