vibration/shudder at 70 - possible alternatives (other than wheel balance?)

[txrocco@sbcglobal.net (ATS - Patrick Bureau)]

the prowler has 205-50-15 and it occured around 79-84MPH
the daily driver has 185-60-14 it occured 76-80MPH

humm... I think we are on something..

ATS - Patrick Bureau - txrocco@sbcglobal.net


=>-----Original Message-----
=>From: scirocco-l-admin@scirocco.org
=>[mailto:scirocco-l-admin@scirocco.org]On Behalf Of Drew Teague
=>Sent: Tuesday, April 22, 2003 8:52 AM
=>To: kcollins1@socal.rr.com; scirocco-l@scirocco.org
=>Subject: Re: vibration/shudder at 70 - possible alternatives (other than
=>wheel balance?)
=>
=>
=>>My Integra with the problem that turned out to be CV had its problem
=>>between about 37-43 mph - a fairly small, very specific speed range and
=>>never outside of it.
=>>
=>>--
=>>Kevin Collins
=>
=>Well, I would think a problem like this would occur when the
=>revolution of
=>the CV's etc was sympathetic with the frequency of whatever is
=>vibrating.
=>It would climb when it gets close, peak, then drop out as you accelerate
=>through.  If you went fast enough, it would probably reoccur in
=>the next 1/2
=>division of the frequency (I think... It's been a while since physics
=>class...)  I know there is a principle concerning this.  I apply it to
=>guitar playing with the use of harmonics..
=>
=>If the same item would be causing the vibration (we're ASSUMING at this
=>point) in all Rocc's, different cars would have vibration
=>occurrences at a
=>slightly different range of speeds, due to different tire sizes.  (bigger
=>tires have greater speed at same RPM than smaller tires)
=>
=>With 195 50 R15's, mine peaks at around 75-77 mph
=>
=>
=>**Drew Teague**
=>Harrisburg, PA
=>
=>'84 8v Rocco --  "Bruise"
=>'85 BMW 318i
=>
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