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



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Big shot in the dark here, but perhaps this vibration has something to do with the differential?  Specifically I'm thinking the differential bearings, mine are going bad and thus my driveflanges have some play in them.   -Rob

Allyn <amalventano@sc.rr.com> wrote:i agree with this theory, but i just shot it out of the water tonight --- i put in a fresh set of rebuilt half shafts. while it did help the issue slightly, the shudder at 70 is still there. over the past week of narrowing the problem down, i have these facts remaining: - vibration seems to be coming from front right.- front right is the wheel is the one i had sent off to the straightener (it came back *very* close to perfectally true.- jacked up front right and spun it (via engine). the wheel seems to be straight as it spins, but the tire seems like it may be slightly out of round. i'll have to check this out some more later. Al ----- Original Message ----- From: L F To: Michael Abatzis ; scirocco-l@scirocco.org Sent: Wednesday, April 23, 2003 7:33 PMSubject: Re: vibration/shudder at 70 - possible alternatives (other than wheel balance?)
I gotta' chime in here fellas;  I've been driving cars for a lot of years and learned that a harmonic vibration most likely is NOT a wheel imbalance.   I'd lean towards CV joint or engine imbalance (I've had both of these situations result in harmonics) Larrysandiego16v----- Original Message ----- From: Michael Abatzis To: scirocco-l@scirocco.org Sent: Tuesday, April 22, 2003 8:41 AMSubject: RE: vibration/shudder at 70 - possible alternatives (other than wheel balance?)
try getting a mounted balance--the wheels are balanced on the car, so it 
essentially balances all that rotating mass (rotors, hubs, etc). my shop 
does it for $8 wheel. i had the wheels/tires balanced unmounted first, then 
mounted; i was amazed how much tweaking needed to be done with the mounted 
balance.  the car is lowered, and is rock solid as fast as i care to go...


-Michael Abatzis
Hotlanta! GA-->Soon to be New Orleans!
1988 Scirocco 2L 16v RIP-->parting, finally taking orders: 
www.learnlink.emory.edu/~mabatzi/mikes_page1.html
1987 Scirocco 2L 16v...




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<DIV>Big shot in the dark here, but perhaps this vibration has something to do with the differential?&nbsp; Specifically I'm thinking the differential bearings, mine are going bad and thus my driveflanges have some play in them.&nbsp; </DIV>
<DIV>&nbsp;</DIV>
<DIV>-Rob<BR><BR><B><I>Allyn &lt;amalventano@sc.rr.com&gt;</I></B> wrote:</DIV>
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<DIV><FONT face=Arial size=2>i agree with this theory, but i just shot it out of the water tonight --- i put in a fresh set of rebuilt half shafts. while it did help the issue slightly, the shudder at 70 is still there. over the past week of narrowing the problem down, i have these facts remaining:</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT>&nbsp;</DIV>
<DIV><FONT face=Arial size=2>- vibration seems to be coming from front right.</FONT></DIV>
<DIV><FONT face=Arial size=2>- front right is the wheel is the one i had sent off to the straightener (it came back *very* close to perfectally true.</FONT></DIV>
<DIV><FONT face=Arial size=2>- jacked up front right and spun it (via engine). the wheel seems to be straight as it spins, but the tire seems like it may be slightly out of round. i'll have to check this out some more later.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT>&nbsp;</DIV>
<DIV><FONT face=Arial size=2>Al</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT>&nbsp;</DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B> <A title=rocco16v@netzero.net href="mailto:rocco16v@netzero.net";>L F</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=abatzis2@hotmail.com href="mailto:abatzis2@hotmail.com";>Michael Abatzis</A> ; <A title=scirocco-l@scirocco.org href="mailto:scirocco-l@scirocco.org";>scirocco-l@scirocco.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Wednesday, April 23, 2003 7:33 PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: vibration/shudder at 70 - possible alternatives (other than wheel balance?)</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial size=2>I gotta' chime in here fellas;&nbsp; I've been driving cars for a lot of years and learned that a <EM>harmonic</EM>&nbsp;<EM>vibration </EM>most likely is NOT a wheel imbalance.&nbsp; </FONT></DIV>
<DIV><FONT face=Arial size=2>&nbsp;I'd lean towards CV joint or engine imbalance (I've had both of these situations result in harmonics)</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT face=Arial size=2>Larry</FONT></DIV>
<DIV><FONT face=Arial size=2>sandiego16v</FONT></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B> <A title=abatzis2@hotmail.com href="mailto:abatzis2@hotmail.com";>Michael Abatzis</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=scirocco-l@scirocco.org href="mailto:scirocco-l@scirocco.org";>scirocco-l@scirocco.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Tuesday, April 22, 2003 8:41 AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> RE: vibration/shudder at 70 - possible alternatives (other than wheel balance?)</DIV>
<DIV><BR></DIV>try getting a mounted balance--the wheels are balanced on the car, so it <BR>essentially balances all that rotating mass (rotors, hubs, etc). my shop <BR>does it for $8 wheel. i had the wheels/tires balanced unmounted first, then <BR>mounted; i was amazed how much tweaking needed to be done with the mounted <BR>balance.&nbsp; the car is lowered, and is rock solid as fast as i care to go...<BR><BR><BR>-Michael Abatzis<BR>Hotlanta! GA--&gt;Soon to be New Orleans!<BR>1988 Scirocco 2L 16v RIP--&gt;parting, finally taking orders: <BR><A href="http://www.learnlink.emory.edu/~mabatzi/mikes_page1.html";>www.learnlink.emory.edu/~mabatzi/mikes_page1.html</A><BR>1987 Scirocco 2L 16v...<BR><BR><BR><BR><BR>_________________________________________________________________<BR>MSN 8 helps eliminate e-mail viruses. Get 2 months FREE*.&nbsp; <BR><A href="http://join.msn.com/?page=features/virus";>http://join.msn.com/?page=features/virus</A><BR><BR><BR>_______________________________________________<BR>Scirocco-l mailing list<BR><A href="mailto:Scirocco-l@scirocco.org";>Scirocco-l@scirocco.org</A><BR><A href="http://neubayern.net/mailman/listinfo/scirocco-l";>http://neubayern.net/mailman/listinfo/scirocco-l</A><BR></BLOCKQUOTE></BLOCKQUOTE></BLOCKQUOTE><p><br><hr size=1>Do you Yahoo!?<br>
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