Posts
42
Joined
9/18/2014
Location
Henderson, NV
US
Edited Date/Time
7/9/2020 11:16pm
Thanks guys ....
Clark from Noleen could not recall the manufacturer of this rear suspension accessory but I
would like to find one available to purchase which would complete my ex- Kyle Lewis 03 CRF450
Moto XXX / YOSHIMURA / Noleen . The team riders were Huffman, Larry Ward and Lewis .
Apparently , it was hydraulic damper designed to improve action and traction thru whoops.
See photo - was mounted under rear axle nut and appears as a vertical tube possibly 10 inches long .
Any knowledge / help or contact info to someone
would certainly
be appreciated . Thank you .
Clark from Noleen could not recall the manufacturer of this rear suspension accessory but I
would like to find one available to purchase which would complete my ex- Kyle Lewis 03 CRF450
Moto XXX / YOSHIMURA / Noleen . The team riders were Huffman, Larry Ward and Lewis .
Apparently , it was hydraulic damper designed to improve action and traction thru whoops.
See photo - was mounted under rear axle nut and appears as a vertical tube possibly 10 inches long .
Any knowledge / help or contact info to someone
would certainly be appreciated . Thank you .
Cool build!
You both make excellent comments which makes sense . I do not know anything about its design but maybe
because Noleen called it an INERTIA DAMPER , I was thinking hydraulic .
Any leads or additional info would be helpful . Noleen claimed it was manufactured by an Italian company . There was an Italian company that I spoke with whom had a device on shock linkage for rear suspension but they were not familiar with this device from 2003ish.
Force = Mass * Acceleration
When you increase the mass and the force input to the rear wheel (hitting a whoop) stays the same, the acceleration is decreased. This decrease in acceleration leads to less force transfer into the rider. At least that's what the theory is. It's a trade-off though. You're adding unsprung mass to the rear suspension which isn't ideal.
The Shop
Basically you can think of a tube filled with oil that has a heavy piston inside with some valving like a shock or fork.
The inertia is due to the mass of the piston.
The damping is due to the movement through oil in the tube.
If you hit a bump in compression, the piston's mass is coupled to the rear wheel as unsprung mass.
During rebound, the valving decouples the piston somewhat so that it's inertia is applied over a longer time.
If you knew the exact specs, you could have one built as a duplicate.
I'm a machinist and develop all kinds of stuff like that in my shop from monster truck shocks to hydraulic cylinders for steering and more. That would be a neat project.
*edit* that article was written by Keefer... Why not send him an e-mail and ask if he knows anything about it. *edt*
A very worthy suspension guru's opinion is that it is mainly used to absorb VIBRATION in the swingarm.
The swingarm is like a large tuning fork and this inertia dampener would reduce chain slap
and brake chatter HARMONICS , which may reduce rider fatigue ???
I have found only one photo of this device on this race bike and is of the right side .
not sure if there is/was one on the left side also ? With chain on left and brake on right ,
there seems a need on both left and right sides .
Previous comments were it may only be a weight . If that were correct , there would be a
simpler way to add weight than fabricating that device , like maybe filling the center of axle .
GM installed four similar dampeners on the first camaro convertibles
and they were nicknamed COCKTAIL SHAKERS ! do search on net to see....
It was a weight suspended by a spring and surrounded by oil .
Thanks again .
Post a reply to: SUSPENSION EXPERTS !! 2003 era - looking for a little help please." INERTIA DAMPENER " tested/raced by Noleen/Moto XXX