Vibrations at 4000rpms
#17
Supercharged
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Location: Back in Michigan - Full time!
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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
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
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.
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.