Demon,
How do you know the degree to which crank whip is affected?
From a NVH standpoint, there is a substantial improvement (especially in higher rev ranges)...I would "assume" that the vibration reduction is a related to crank whip reduction. I talked with Judge years ago, IIRC he thought bench testing showed a substantial reduction. The 2-3 HP DMD gain on the dyno "may" support less frictional loss..though this is admittedly withing the error range of the dyno.
Duratec is a VERY smooth motor with the DMD..I guess it is hard for me to understand how you would get this improvement without reducing whip to a significant degree..
