V-Thunder Torsional Vibration Absorber. Any knowlege here

[gryphon]

Here's the claim made by Comp Cams/V-Thunder:

Due to their mechanical design, all internal combustion engines emit torsional crankshaft
vibrations. Harley Davidsons® are no exception. These twisting vibrations are caused by
slight increases and decreases in engine speed during the power and compression strokes.
This twisting can be controlled either by dissipating the energy, or by absorbing the energy
that causes the crankshaft to twist.
The VTVA5 provides torsional control in the form of internal rollers designed to automatically
offset the twisting forces, thereby eliminating the vibration. The VTVA5 is a CNC machined,
high-quality mechanism that simply bolts in place of the OEM compensator and crankshaft torsional vibration
absorber. Made in the United States.

Don't know if there's any merit to their claims. I tried a Fisher absorber/sprocket device about 3 years back while I was still running a shovel (EVO now) and found that I did notice a difference but very slight. Perhaps an increase of about 3 mph before reaching that given vibration level experienced prior to installation (4th and 5th gears). Seemed like something a guy migh be able to use if he had a pretty smooth ride already and was just fine tuning. I like the V-Thunder cams and so wondered about their absorber. BTW, I quit running the Fisher because to just wore out. It had an unknown number of miles prior to my installing it and after about 2 years I started getting what sounded like a loose chain. Stopped the noise when I dropped the fisher unit.