[Roadsters] Vibration

[Mark]

  Here is where I am now - phasing was a bit off - less than 90 degrees, 
but off - and I have corrected it...but no change.  I do not suspect 
wheels/tires as it is felt in the entire car....with and without the car 
in gear/clutch in...and all was smooth before I pulled everything out.  
Same for the rough engine - the vibration doesn't change based on engine 
speed, just ground speed.   Engine mounts are new(er) - maybe a year 
ago, but no real miles on them.  I guess I need to concentrate on 
alignment....hard to believe I could get it that far off, but I guess 
anything is possible.  I will get the jack stands back out and take a 
look! May take a day or 2, but I will report back what I find!

Mark



On 9/1/2010 2:41 PM, Tom Lorick wrote:
> No change whatsoever after changing the joints is worrisome and while it's
> reasonable to suspect driveline balancing - I don't think so.  That said,
> it's pretty cheap to do and should be considered regardless (mine was $85 to
> have it balanced).  Have you ruled out wheels/tires?  Did you make sure to
> install the universal joints "in proper phase" (probably not an issue with
> new joints at least not right away)?
>
> I am not sure how the transmission mount being a little tall, or a little
> short alone would cause a vibration.  Maybe you have torqued it down out of
> alignment, try loosening the mount and shifting the engine/transmission
> until straight, and then re-torque.
>
> Also is it possible the vibration is from the way it is running, and it just
> wasn't noticed before because the old mount was so shot?  One more thing,
> check the engine mounts, if the tranny  mount was shot the engine mounts may
> not be far behind.
>   After all of that, then you may have to start looking internal to the
> transmission.
> My $0.02 worth
>
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