Originally posted by DemonSVT:
Originally posted by ScottK97SEMTX:
[qb]Which has nothing to do with UDP's :p
It's a prime example.
If the stock damper takes out harmonics to lessen crank whip and torsional bending and the DMD takes even more flex and whip out (above 3000rpm mainly) I think having ZERO damper and taking ZERO flex, vibrations, and whip out would constitute a valid reason for failure due to crank whip.
Don't you?
QB]Nope - you are confused.
DMD - the "dual mode" is torsional and lateral damping. Torsional vibes have nothing to do with whip - I could search for Terry's posts where he states this. To lessen crank whip you need the second mode damping of the DMD - so the stock and the UDP are exactly the same for this (ie do nothing to lessen whip). Also I've never heard that the torsional damping range of an UDP is any greater than the stock unit, it just also damps lateral in the same range.
The danger of the UDP is that the torsional vibes will resonate at the crank freq and and cause a fracture, typically (IIRC) seen around bearing one. :p
