Vibration!

[BLUETHUNDER]

I'm getting vibration from the Cerb.Starts at about 90mph,and is still there at about 150mph.Any ideas?.Ive had the wheels balanced.But to be honest it feels transmission based,i.e bent drive shaft,or an out of balance prop.Anyone know where the balance weights on the prop are located??.And has anyone else had this problem,and what were the findings.

[Far Eastender]

A slight buckle on one of the wheels? I've got the same problem at 70MPH +.

[kojak]

I had it on a capri years ago. Prop shaft out of balance and knackered uv joint.

[FUBAR]

Far Eastender said:

A slight buckle on one of the wheels? I've got the same problem at 70MPH +.

Good job you drive like a girl then

[WIL35]

BLUETHUNDER said:

Anyone know where the balance weights on the prop are located??.

When I was doing my clutch , I noticed my propshaft had some small 'patches' of metal welded to the side. Not sure if that might be how they balance it.

[Far Eastender]

FUBAR said:

Far Eastender said:

A slight buckle on one of the wheels? I've got the same problem at 70MPH +.

Good job you drive like a girl then

GRRRRRRRRRRRRRRR..............

[FUBAR]

[The AJP Griff]

WIL35 said:

BLUETHUNDER said:

Anyone know where the balance weights on the prop are located??.

When I was doing my clutch , I noticed my propshaft had some small 'patches' of metal welded to the side. Not sure if that might be how they balance it.

Indeed it isYou could find balance weights anywhere along the tube of the shaft.Look for any different coloured small square or rectangular,patches as a sign of one having fallen off.

[touching cloth]

Far Eastender said:

FUBAR said:

Far Eastender said:

A slight buckle on one of the wheels? I've got the same problem at 70MPH +.

Good job you drive like a girl then

GRRRRRRRRRRRRRRR..............

Is that you trying to find first gear Over to the left and up

[amazon]

Not much help to you, but I get this too. From about 70mph, but stops around 165mph if we're cornering

I have had wheels rebalanced, no change. Interested to watch this thread, because it's very annoying.....(not the thread, the vibration )

[BLUETHUNDER]

The AJP Griff said:

WIL35 said:

BLUETHUNDER said:

Anyone know where the balance weights on the prop are located??.

When I was doing my clutch , I noticed my propshaft had some small 'patches' of metal welded to the side. Not sure if that might be how they balance it.

Indeed it isYou could find balance weights anywhere along the tube of the shaft.Look for any different coloured small square or rectangular,patches as a sign of one having fallen off.

I was looking for the small tack welded plates,but couldnt see them.I will put it up on the ramp in the morning,and have a proper look.

[350Matt]

take it to Dave mac props in Coventry he'll balance it, replace any joints that need doing and give it a lick of paint generally for about £50....

Matt

[HRG]

Out of round tyre?

[Cyclone1]

Diff
Diff bolts?

[Brummmie]

Far Eastender said:

A slight buckle on one of the wheels? I've got the same problem at 70MPH +.

They would have to be quite seriously bent to effect it, the tyre will still seat level with bends in, one of my rears had a slight bend in, but was fine at an indicated 200mph.
Slack U/J? try up and down not sliding, as they are meant to. Prop bolts could be looked at whilst there too. I use Dave Mac in Coventry for props, so can vouch for him.

Edited by Brummmie on Thursday 18th September 08:59

[BLUETHUNDER]

So far i've checked the tyres.Need extra balance weights to the front,which probably suggests buckled wheel or out of shape tyre.I've also checked the diff bushes.No movement in them,and the diff is solid,with no bearing noise.

[Brummmie]

BLUETHUNDER said:

So far i've checked the tyres.Need extra balance weights to the front,which probably suggests buckled wheel or out of shape tyre.I've also checked the diff bushes.No movement in them,and the diff is solid,with no bearing noise.

If its front you would feel steering wheel shake, beware who balances them, bigger the wheel the better the person/equipment must be. I had mine done recently and had to have them redone by someone else, it went through a vibration at 90mph, it transpires my wheels were 40grams out, even though they had been done by the previous tyre centre.

[BLUETHUNDER]

I must admit,the vibration doesnt seem to be coming from the front,but the rear.Will have a look at the prop bolts,and check the UJ,s.

[trackcar]

Is it a rhythmic droning/vibration that comes and goes like a beat frquency ?

[BLUETHUNDER]

No.But it does get worse the more speed you pile on.If that helps.