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A crankshaft damper is usually a two-piece affair, often doubling as a pully, separated by a band of thick rubber bonded between the two parts. The outer metal ring provides some mass that, along with the rubber, dampens shaft vibration at a critical rpm range. Frere's statement implies Porsche used a crank pulley-type damper and it wasn't altogether successful as the vibration still managed to loosen the flywheel bolts. However, I've never seen anything like it (as though that means anything). Maybe that's why Porsche eventually went from 6 flywheel bolts to 9 bolts on the later engines (but that was in '78).
Let's hope sharper minds can provide an answer.
Sherwood
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