[Tyson Schmidt]

The dual mass flywheel was used to dampen the noise that the G-50 trans is famous for. It really isn't about dampening frquencies related to crankshaft longevity.

The front pulley on the 964 served that purpose. The 993 didn't need it due to the stiffer crank and lighter rods.

So in effect, you're both right. Harald likely meant what I posted rather than "balance". Substitute "dampen" input shaft noise for "balance" input shaft. Close enough in my book for a guy who speaks English as a second language.


In regard to the cracked case, It makes me see why they switched to a much higher torque spec for the through-bolts on the 964/993 case. Things obviously move around quite a bit more with the extra torque output and longer stroke.


Thanks for the heads-up Henry!