tbennett017

What exactly IS one? Are there two parts, that are separate? What is it that is "dual mass" about it? I have visions of moving parts or some wierd sandwich of materials...

Just something I have always wondered about.

Indycam

Its a "soft" flywheel .

"Are there two parts, that are separate?"
At least three .
One mass , softness , another mass .

http://www.luk.com/content.luk.de/en...ew/zms_new.jsp

http://www.roadandtrack.com/article....rticle_id=1623

Tom W

It's a rubber sandwich with metal instead of bread. The rubber cushions some of the shock as the clutch is engaged.

zicoramone

The dual mass systems are designed to transmit less engine vibration to the driveline, and give a better more car like driving experience.The single mass part will tend to transmit more engine pulse (vibration) tot he drivetrain, and will seem a bit rougher. But it is straight forward to design a single mass flywheel and clutch package for pretty much any engine torque curve and vehicle loading combo you can come up with. Drives more like a TRUCK, but has much better reliability at extreme use levels.(from high-impact)

dutchcrunch

very smooth clutch engagement , no chatter or bucking

tbennett017

So that explains the gravel truck sound in 1-2 then... kinda hissy gravelly? I had a DMF in an Audi and its true, the clutch action is really smooth...