Vibrations at 4000rpms
#17
Supercharged
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Mine went like that too after a session at the dyno. My guess is that in my case, the carriers were slowly shifting for some time, and at some point finally reached a position where the resonance was "released" making it appear that it happened all of a sudden.
#18
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Replacing the bearings in the TT yourself will consume the least dollars. If you take your time and do a thorough job it should be a fairly durable fix too. There are easier (buy rebuilt TT from 928 Intl.) and better (Constantine "super bearing") approaches, but I did the bearing replacement myself some years ago and it has remained vibration-free for quite a number of years, which have included many DE weekends. You can find my experiences documented on the Nichols tips site at:
http://www.nichols.nu/tip814.htm
http://www.nichols.nu/tip814.htm
#20
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If using the normal bearings you could consider installing some small 'grub screws' into the torque tube fore and aft of each bearing carrier to prevent any future migration
#21
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Yep if not using Constantine's "super bearing" then you will be using 20 ++ something old rubber and it is most likely shot and they will move unless you "pin" them in place, especially when that balance weight starts moving ![Frown](https://rennlist.com/forums/images/smilies/frown.gif)
And that's another nice feature of Constantine's produce, no balance weight required, AO recently drove my '86.5 Auto after I did the TT job and commented on how smooth it drove.
![Frown](https://rennlist.com/forums/images/smilies/frown.gif)
And that's another nice feature of Constantine's produce, no balance weight required, AO recently drove my '86.5 Auto after I did the TT job and commented on how smooth it drove.