Silastic M-2 http://www.dowcorning.com/applications/search/default.aspx?R=2164EN is an RTV platinum cure silicone from Dow Corning. It is very easy to work with; weigh, vacuum degass, mix, vacuum degass, pour.
Yes, Porsche is still using the DMF even in the high (450HP+) horsepower cars.
The damper between the two masses fails and you end up with a clunking. Porsche allowed upto 15mm of movement (with return) before they declared the flywheel dead.
I'm not sure I would call 100,000 miles out of...
In 89-90 Porsche used the original Freudenberg and then in 91-92 they used a modified Freudenberg. From 92 onward they switched to LUK.
75-100,000+ miles, its the Freudenbergs that failed prematurely.
The only difference I know of is the LUK thrust ring is riveted to the flywheel there is...
Interesting, Porsche had a similar problem with their 911 series from 1989 to late 1992. ALL their Freudenberg flywheels would fail and they (the owner) replaced them with a model from LUK (absolutely no warranty repairs obviously).
