Shilvers
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 posted on 8/6/08 at 07:25 PM |
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Bad Vibrations
Evening all.
I've managed to develop a noticable vibration at 50mph. It's not present until 50 & disappears if you go quicker. It's speed
related as well as it's still there when you dip the clutch and just roll at that speed. Nothings seems loose and the car behaves exactly as
before except for the vibration. My first thoughts are obviously the wheel balance (it's coming from the rear as far as I can tell because the
vibration doesn't affect the steering.) So, apart from getting the rear wheels re-balanced, is there anything else I should be looking for that
could cause the problem? Anyone had anything similar?
Thanks folks
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big_wasa
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| posted on 8/6/08 at 07:32 PM |
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wheel nuts
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Shilvers
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| posted on 8/6/08 at 07:39 PM |
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quote:
Originally posted by big_wasa
wheel nuts
Checked and they were okay, but will check again 
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britishtrident
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| posted on 8/6/08 at 07:43 PM |
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The speed range affected tends to indicate a wheel balance issue.
(1) Check the propshaft flange bolts are tight and that any balance weights haven't been thrown off the shaft.
(2) Check all tyres and riims for running out of true
(3) Get front wheels balanced ---- just because you don't feel it through the steering dosen't mean it isn't from
the front wheels.
If that dosen't work get all four wheels rebalanced by another tyre shop.
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omega 24 v6
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| posted on 8/6/08 at 07:43 PM |
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prop thrown a balance weight??
If it looks wrong it probably is wrong.
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Triton
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| posted on 8/6/08 at 07:56 PM |
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Driveshafts maybe? And agree check the fronts as could be misleading
My Daughter has taken over production of the damn fine Triton race seats and her contact email is emmatrs@live.co.uk.
www.tritonraceseats.com
www.hairyhedgehog.com
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joetait
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| posted on 8/6/08 at 08:28 PM |
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Is the wheel located on the hub centrally?
Some people fit wheels which dont have the correct spigot ring and just rely on the nuts to try and centralise the wheel to the hub which doesnt work
well.
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Shilvers
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| posted on 8/6/08 at 08:35 PM |
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Cheers guys
The rears are off and I'll check them tomorrow. One of the weights isn't looking in very good nick so I'll hope for the simple fix,
will check the fronts as well just to be sure.
Watch this space.....
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britishtrident
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| posted on 9/6/08 at 07:00 AM |
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quote:
Originally posted by joetait
Is the wheel located on the hub centrally?
Some people fit wheels which dont have the correct spigot ring and just rely on the nuts to try and centralise the wheel to the hub which doesnt work
well.
Wheels have been centralised using the nuts for about 90 odd years.
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britishtrident
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| posted on 9/6/08 at 07:19 AM |
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quote:
Originally posted by Shilvers
Cheers guys
The rears are off and I'll check them tomorrow. One of the weights isn't looking in very good nick so I'll hope for the simple fix,
will check the fronts as well just to be sure.
Watch this space.....
Too explain a bit about wheel balance, wheels have to be kept in two types of balance static and dynamic.
How badly a car is affected by wheel balance depends a lot on factors like king pin inclination, wheel offset and scrub radius, caster and
stiffness of the wishbone mountings.
If a wheel is in Dynamic balance but not static balance in many cases if the car has a smal scrub radius and king pin inclnation it might not be felt
through the steering but will be felt transmitted through the suspension to the structure
Taking 1970s Fords as an example Capris were very sensitive to static wheel balance which could be felt through the steering wheel because of the
large scrub radius and the use of the anti-roll bar to form part of the lower wishbone.
The 1970s Cortinas had much less scrub radius and king pin inclination than the Capri as result were less sensitive to static wheel balance problems
being transmitted through the steering.
A very common cause of difficult to balance wheels can be a chunk rubber debris left rolling around inside the tyre after a puncture repair.
[Edited on 9/6/08 by britishtrident]
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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Hellfire
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| posted on 9/6/08 at 10:49 AM |
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quote:
Originally posted by britishtrident
Taking 1970s Fords as an example Capris were very sensitive to static wheel balance which could be felt through the steering wheel because of the
large scrub radius and the use of the anti-roll bar to form part of the lower wishbone.
A very common cause of difficult to balance wheels can be a chunk rubber debris left rolling around inside the tyre after a puncture repair.
[Edited on 9/6/08 by britishtrident]
As the owner of three 1.6, 2.0S and 2.8i - I used to get them balanced on the car. Not sure it exists anymore...
Still makes me want another 2.8i as I loved that car...
Steve
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britishtrident
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| posted on 9/6/08 at 12:50 PM |
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quote:
Originally posted by Hellfire
quote:
Originally posted by britishtrident
Taking 1970s Fords as an example Capris were very sensitive to static wheel balance which could be felt through the steering wheel because of the
large scrub radius and the use of the anti-roll bar to form part of the lower wishbone.
A very common cause of difficult to balance wheels can be a chunk rubber debris left rolling around inside the tyre after a puncture repair.
[Edited on 9/6/08 by britishtrident]
As the owner of three 1.6, 2.0S and 2.8i - I used to get them balanced on the car. Not sure it exists anymore...
Still makes me want another 2.8i as I loved that car...
Steve
Used to do a lot of them we had an old fashioned hand spun wheel balancer that gave excellent results but even with that Capri front end vibrations
could be hard to cure.
Quite often changing the anti-roll bar bushes would alleviate it --- the vibration could sometimes be triggered by even a tiny ammount of run out in
the brake discs, Girling brought out a special abrasive brake pad to take the high spots off the disc that usually cured the difficult cases.
[Edited on 9/6/08 by britishtrident]
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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Shilvers
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| posted on 10/6/08 at 06:29 AM |
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Well, got the rears balanced, went for a drive and ended up having to wait for the AA for an hour and a half! 
I heard what sounded like some metal deciding to escape from under the car and slowed right down, by this time the vibration was unbearable! Anyways,
it sheared 3 of the bolts connecting the prop to the engine and when I got back was only connected by one, which I cut out as I was all bent out of
shape. So there you have it, lesson learnt.
From what I can see everything seems to be turning true so I'll hopefully be able to just bolt it all up again, I'm just hoping I
don't miss too much of the sun! 
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