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Bump steer is different to vibration. Bump steer is when the trackrods =
are not at the idle angle on smooth surfaces, and that angle increases =
when you hit a bump i.e. compress the suspension. That effectively =
pulls the wheels in or give more toe in. Bad enough if both wheels go =
up by the same amount, but if only one wheel hits a bump only that turns =
in so with the other wheel pointing as it was the car changes direction.
Vibration over a bump is something loose, or something hitting something =
it shouldn't i.e. insufficient clearance somewhere, or something worn =
i.e. too much clearance. If the damper bearings are badly worn it could =
be them, but usually it is just the oil seals that go. It could also be =
king pins, bearings, upper and lower trunnions, track-rod ends, anything =
in the rack, the UJ, or the column. It could be that the problem was =
always there, but the bump-steer from lowering the suspension has made =
it noticeable.
PaulH.
----- Original Message -----=20
I hope someone can help me. I have a 1980 MGB that has been lowered =
with parts sourced from Moss Motors. Since lowering the car I have an =
annoying vibration in the steering wheel whenever I hit a bump.
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<DIV><FONT size=3D2>Bump steer is different to vibration. Bump =
steer is when=20
the trackrods are not at the idle angle on smooth surfaces, and that =
angle=20
increases when you hit a bump i.e. compress the suspension. That=20
effectively pulls the wheels in or give more toe in. Bad enough if =
both=20
wheels go up by the same amount, but if only one wheel hits a bump only =
that=20
turns in so with the other wheel pointing as it was the car changes=20
direction.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>Vibration over a bump is something loose, or =
something=20
hitting something it shouldn't i.e. insufficient clearance somewhere, or =
something worn i.e. too much clearance. If the damper bearings are =
badly=20
worn it could be them, but usually it is just the oil seals that =
go. It=20
could also be king pins, bearings, upper and lower trunnions, track-rod =
ends,=20
anything in the rack, the UJ, or the column. It could be that the =
problem=20
was always there, but the bump-steer from lowering the suspension has =
made it=20
noticeable.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>PaulH.</FONT></DIV>
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<DIV style=3D"FONT: 10pt arial">----- Original Message ----- =
</DIV><BR>
<P class=3DMsoNormal>I hope someone can help me. I have a 1980 MGB =
that has been=20
lowered with parts sourced from Moss Motors. Since lowering the car I =
have an=20
annoying vibration in the steering wheel whenever I hit a =
bump.</P><!--[if gte mso 9]><xml>
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