[Rovernet] Vibrations galore

[Lance La Certe]

Thanks for the suggestion about the damper weight.  It is still intact

Lance

Pastafarian
AKA, Hoof Hearted

First Law of Debate:  Never argue with a fool --- people might not know the difference.






________________________________
From: Rovernet <rovernet-bounces at rovernet.org> on behalf of Steven Dibdin via Rovernet <rovernet at rovernet.org>
Sent: Wednesday, June 12, 2024 3:43 PM
To: Rovernet <rovernet at rovernet.org>
Cc: Steven Dibdin <sdibdin at gmail.com>
Subject: Re: [Rovernet] Vibrations galore

I would add something to Jon’s response.

Is the damper weight still attached to the diff extension? That’s the triangular thing mounted with three rubber pucks. Check that and the extension mount as the final drive can easily set up harmonic vibrations just as you describe. In fact that’s probably what destroyed the drive train on the Group 2 race car at Nuremberg ring in the 70’s.

S-

Sent from a small screen, please excuse any typos.

On Jun 12, 2024, at 11:39, Jon Stanley via Rovernet <rovernet at rovernet.org> wrote:



Lance,

I had a very similar sideways vibration on an older Jeep truck driving 55-70mph and the culprit was an out of balance driveshaft.



I would suspect your driveshaft isn’t balanced. Could be because balancing weight rusted or flew off or shaft got kinked from a speed bump.



Jon



From: Lance La Certe via Rovernet<mailto:rovernet at rovernet.org>
Sent: Wednesday, June 12, 2024 10:04 AM
To: Rovernet<mailto:rovernet at rovernet.org>
Cc: Lance La Certe<mailto:lacpsyd6 at msn.com>
Subject: [Rovernet] Vibrations galore



Some of you may remember "Magic Fingers" vibrating beds in 1960s motels?   Well, that cost 25 cents for 15 minutes.   In my '70 P6B NADA I can get this for free between 60mph and 68mph for as long as I want.



Some background.    6-7 years ago I retrofitted a Celica Supra 5 speed manual to the car.  It instantly transformed that V8 into a proper beast (relatively speaking of course).   The modification also required a new propellor shaft which was supposedly balanced.



I never take particularly long drives in my garage queen, and rarely 'open her up'.   Nonetheless, I was on the interstate the other day and noticed significant vibration through the car at anything over 60 mph.  If I pushed it past 70 mph then the vibration abated.



Would really appreciate any diagnostic help



Lance



Pastafarian

AKA, Hoof Hearted



First Law of Debate:  Never argue with a fool --- people might not know the difference.















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