[JFP in PA]

Funny, I never said ANYTHING about your cherished light weight flywheel…….

"A dual-mass flywheel (DMF) is a rotating mechanical device that is used to provide continuous energy (rotational energy) in systems where the energy source is not continuous, the same way as a conventional flywheel acts, but damping any violent variation of torque or revolutions that could cause an unwanted vibration. The vibration reduction is achieved by accumulating stored energy in the two flywheel half masses over a period of time but damped by a series of strong springs, doing that at a rate that is compatible with the energy source, and then releasing that energy at a much higher rate over a relatively short time"

From a LUK white paper on DMF theory:

"The primary feature of the DMFW is the almost complete isolation of torsional vibrations."

"The DMFW permanently alters the vibration system of the crankshaft. In
the conventional system, the heavy flywheel including the clutch is rigidly
connected with the crankshaft. The large inertia of the flywheel generates
high reaction forces on the crankshaft.
The DMFW system behaves more favorably because the secondary
flywheel mass can be disregarded for the bending load. It is only very
loosely connected via the torsion damper as well as via the roller bearing to
the primary flywheel mass and therefore generates practically no reactions.
The primary flywheel mass is much lighter than a conventional flywheel and
is also elastic, like a flexplate for a torque converter.
Inherent bending and torsion resonance forms change with the DMFW in
comparison to a conventional system. The crankshaft is mostly relieved.
Figure 7 illustrates a measured example. Both torsion and bending
vibrations are lower with the DMFW. In individual instances, it must be
decided whether the crankshaft damper can be omitted or if a simpler
material can be used for the crankshaft, such as a casting."

Sure sounds like the people that make them believe other wise about what a DMF does...……..…...