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vibration/shudder at 70 - possible alternatives (other than wheel balance?)
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..and now it's time to check engine balance. Note the rpm at which this =
harmonic takes place on the road. Then, rev the engine to the same rpm =
while stationary. This will rule out engine imbalance..... or verify =
it.
Larry
----- Original Message -----=20
From: Allyn=20
To: L F ; Michael Abatzis ; scirocco-l@scirocco.org=20
Sent: Wednesday, April 23, 2003 10:20 PM
Subject: Re: vibration/shudder at 70 - possible alternatives (other =
than wheel balance?)
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:
=20
- 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.
=20
Al
=20
----- Original Message -----=20
From: L F=20
To: Michael Abatzis ; scirocco-l@scirocco.org=20
Sent: Wednesday, April 23, 2003 7:33 PM
Subject: 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. =20
I'd lean towards CV joint or engine imbalance (I've had both of =
these situations result in harmonics)
Larry
sandiego16v
----- Original Message -----=20
From: Michael Abatzis=20
To: scirocco-l@scirocco.org=20
Sent: Tuesday, April 22, 2003 8:41 AM
Subject: 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=20
essentially balances all that rotating mass (rotors, hubs, etc). =
my shop=20
does it for $8 wheel. i had the wheels/tires balanced unmounted =
first, then=20
mounted; i was amazed how much tweaking needed to be done with the =
mounted=20
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:=20
www.learnlink.emory.edu/~mabatzi/mikes_page1.html
1987 Scirocco 2L 16v...
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<DIV><FONT face=3DArial size=3D2>..and now it's time to check engine =
balance. =20
Note the rpm at which this harmonic takes place on the road. Then, =
rev the=20
engine to the same rpm while stationary. This will rule out engine =
imbalance..... or verify it.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>Larry</FONT></DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"BORDER-LEFT: #000000 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: =
0px; PADDING-LEFT: 5px; PADDING-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
<A href=3D"mailto:amalventano@sc.rr.com"; =
title=3Damalventano@sc.rr.com>Allyn</A>=20
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
href=3D"mailto:rocco16v@netzero.net"=20
title=3Drocco16v@netzero.net>L F</A> ; <A =
href=3D"mailto:abatzis2@hotmail.com"=20
title=3Dabatzis2@hotmail.com>Michael Abatzis</A> ; <A=20
href=3D"mailto:scirocco-l@scirocco.org"=20
title=3Dscirocco-l@scirocco.org>scirocco-l@scirocco.org</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Wednesday, April 23, 2003 =
10:20=20
PM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: vibration/shudder =
at 70 -=20
possible alternatives (other than wheel balance?)</DIV>
<DIV><BR></DIV>
<DIV><FONT face=3DArial size=3D2>i agree with this theory, but i just =
shot it out=20
of the water tonight --- i put in a fresh set of rebuilt half shafts. =
while it=20
did help the issue slightly, the shudder at 70 is still there. over =
the past=20
week of narrowing the problem down, i have these facts =
remaining:</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>- vibration seems to be coming from =
front=20
right.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>- front right is the wheel is the one =
i had sent=20
off to the straightener (it came back *very* close to perfectally=20
true.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>- jacked up front right and spun it =
(via engine).=20
the wheel seems to be straight as it spins, but the tire seems like it =
may be=20
slightly out of round. i'll have to check this out some more=20
later.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Al</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"BORDER-LEFT: #000000 2px solid; MARGIN-LEFT: 5px; =
MARGIN-RIGHT: 0px; PADDING-LEFT: 5px; PADDING-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
<A href=3D"mailto:rocco16v@netzero.net"; =
title=3Drocco16v@netzero.net>L F</A>=20
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A=20
href=3D"mailto:abatzis2@hotmail.com"; =
title=3Dabatzis2@hotmail.com>Michael=20
Abatzis</A> ; <A href=3D"mailto:scirocco-l@scirocco.org"=20
title=3Dscirocco-l@scirocco.org>scirocco-l@scirocco.org</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Wednesday, April 23, =
2003 7:33=20
PM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: =
vibration/shudder at 70 -=20
possible alternatives (other than wheel balance?)</DIV>
<DIV><BR></DIV>
<DIV><FONT face=3DArial size=3D2>I gotta' chime in here =
fellas; I've been=20
driving cars for a lot of years and learned that a=20
<EM>harmonic</EM> <EM>vibration </EM>most likely is NOT a wheel =
imbalance. </FONT></DIV>
<DIV><FONT face=3DArial size=3D2> I'd lean towards CV joint or =
engine=20
imbalance (I've had both of these situations result in=20
harmonics)</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>Larry</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>sandiego16v</FONT></DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #000000 2px solid; MARGIN-LEFT: 5px; =
MARGIN-RIGHT: 0px; PADDING-LEFT: 5px; PADDING-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- =
</DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
<A href=3D"mailto:abatzis2@hotmail.com"; =
title=3Dabatzis2@hotmail.com>Michael=20
Abatzis</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A=20
href=3D"mailto:scirocco-l@scirocco.org"=20
title=3Dscirocco-l@scirocco.org>scirocco-l@scirocco.org</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Tuesday, April 22, =
2003 8:41=20
AM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> RE: =
vibration/shudder at 70=20
- possible alternatives (other than wheel balance?)</DIV>
<DIV><BR></DIV>try getting a mounted balance--the wheels are =
balanced on=20
the car, so it <BR>essentially balances all that rotating mass =
(rotors,=20
hubs, etc). my shop <BR>does it for $8 wheel. i had the =
wheels/tires=20
balanced unmounted first, then <BR>mounted; i was amazed how much =
tweaking=20
needed to be done with the mounted <BR>balance. the car is =
lowered,=20
and is rock solid as fast as i care to go...<BR><BR><BR>-Michael=20
Abatzis<BR>Hotlanta! GA-->Soon to be New Orleans!<BR>1988 =
Scirocco 2L=20
16v RIP-->parting, finally taking orders: <BR><A=20
=
href=3D"http://www.learnlink.emory.edu/~mabatzi/mikes_page1.html";>www.lea=
rnlink.emory.edu/~mabatzi/mikes_page1.html</A><BR>1987=20
Scirocco 2L=20
=
16v...<BR><BR><BR><BR><BR>_______________________________________________=
__________________<BR>MSN=20
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href=3D"http://join.msn.com/?page=3Dfeatures/virus";>http://join.msn.com/?=
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href=3D"mailto:Scirocco-l@scirocco.org";>Scirocco-l@scirocco.org</A><BR><A=
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