Rolls-Royce and Bentley Forums banner
1 - 20 of 26 Posts

·
Registered
1999 Rolls-Royce Silver Spur, Mulsanne Green
Joined
·
154 Posts
Discussion Starter · #1 ·
Still have a high speed vibration in my Spur. Has anyone ever bent a 16” alloy wheel? Starting to think that is my issue. Just gets worse the faster you go. Especially over 80. I drive my car daily.
 

·
Registered
Joined
·
1,618 Posts
If the wheel is bent, it will show up in the balancing. Are you sure the vibration is in the wheels and not in the drivetrain? I was 100% that my wheels were bent on my R129 Mercedes and no amount of balancing would fix it. I swapped them over with another car and i still got the vibration in the R129 and not in the other car. I'm now thinking it's a flex disc or u-joint.
 

·
Registered
1999 Rolls-Royce Silver Spur, Mulsanne Green
Joined
·
154 Posts
Discussion Starter · #4 ·
Yes I have. I had them balanced twice (new tires) and then road force balanced where we noted an out of round tire. Replaxed it with same new tire. Better but not cured. Also replaxed steering rack as center pivot was wobbly. Front end is good. The problem feels like it is in the rear vs front.

The one suspect wheel is going to be pulled and I’m going to mount my unused spare, drive it, and see if that is better. If so, I will pull my new tire off old wheel and install it on the spare. I hate this. Really bugs me that my wife’s new Genesis rides about a million times better than this car.

Have you had your tires road force balanced? I had to have those on my Seraph done to remove a highway speed vibration around that same speed.
 

·
Registered
1999 Rolls-Royce Silver Spur, Mulsanne Green
Joined
·
154 Posts
Discussion Starter · #5 ·
If the wheel is bent, it will show up in the balancing. Are you sure the vibration is in the wheels and not in the drivetrain? I was 100% that my wheels were bent on my R129 Mercedes and no amount of balancing would fix it. I swapped them over with another car and i still got the vibration in the R129 and not in the other car. I'm now thinking it's a flex disc or u-joint.
I am not 100 percent sure and that is the best place I am going to look. Had that thought about u-joints earlier this week driving on the highway.
 

·
Registered
Joined
·
2,500 Posts
On car balancing is supposed to be the most precise.
Yes it could be drivetrain, but also balance.

Look at this

 

·
Registered
Joined
·
4,178 Posts
View the attachment. The prop shaft contains components that will contribute to vibration when they wear and should be checked.
 

·
Registered
Joined
·
298 Posts
I had a vibrating problem on my 96 brooklands I tried getting the wheels balanced all different ways until ghost motors told me it was a high speed misfire caused by the ABS ecu having a senior moment !!! these cars cut the sparks when they change gear to smooth it out and for some reason it’s done by the ABS ecu. They changed the ECU for a rebuilt one and the vibration went away. - the ABS system was working as it should as far as I was concerned
 

·
Registered
Joined
·
29 Posts
I looked after a succession of Rolls Royce motor cars for a wealthy gentleman. Many years ago he had a Silver Spirit 1. This car was a complete lemon. We used to say it had been built on a Friday afternoon after the lads had been to the pub at lunchtime. The car had numerous issues one of which was a marked vibration at motorway speeds. When alone the passenger seat backrest shook noticeably. At the owner's suggestion, I arranged for and sent it to the Crewe factory.
They found and fixed numerous items but were struggling with the vibration. They invited me down to the factory to drive it. (just over an hour away). They had temporarily fitted a set of alloy wheels (they did look good on the car). They invited me to drive it. It was an interesting experience as they had various computer cables attached to the steering wheel. It was better, but not cured.
I asked if they had balanced the prop shaft. They said they couldn't do that in-house. I said well then they need to remove it & send it out to be balanced by a specialist. This they (rather reluctantly) did after which the vibration problem was 90% better. I guess not many have had the opportunity to tell Rolls Royce at Crewe how to fix a problem with one of their own cars!
 

·
Registered
Joined
·
6 Posts
About 7 years ago when I first purchased my 1978 Corniche DRH32489, I found I had a rather bad wheel wobble like the wobbles described in all these posts. The wobble occurred between 95 to 105 km/h, ie roughly 55 to 65 mph. I did all the things that were suggested in this forum. I got the wheels balanced, I got wheel alignments and discussed things with the alleged experts - all to no avail.

I mentioned this to Steve Sparks, the RR&B guru in Brisbane, Australia. He told me that his father, Barry (also a RR&B guru, but then retired but still active in the local RR club etc), had experienced similar problems many years before with his car which, from memory was a Spirit. He said that Barry ended up running recommended tyre pressures in the car, and the problem disappeared.

This sounded rather simplistic, but since I was desperate and all the mechanics and tyre specialists couldn't fix my problem, I tried it. The factory pressures were 24psi front, 28psi rear. I set the pressures to those settings and the problem disappeared!

So simple, yet it worked. Perhaps it might work on your particular vehicles. I really don't know why this occurs, but I am not complaining about a simple solutioin.

Cheers

John Rowney
Mermaid Beach, Queensland, Australia
 

·
Registered
1999 Rolls-Royce Silver Spur, Mulsanne Green
Joined
·
154 Posts
I looked after a succession of Rolls Royce motor cars for a wealthy gentleman. Many years ago ...........
Great story! Mine really isn’t in the steering wheel. It’s either a bent rear wheel (it has 16” factory alloys) or driveline problem as was the case here. When I take it to the shop next week I am going to have my wife drive it and I will drive behind her on the highway. I will be able to see if I have a wheel problem then. If not, we go to the prop shaft.
 

·
Registered
Joined
·
4,178 Posts
Again, put it on a lift to observe a crooked wheel or prop issues. Following from the rear to observe a wheel that is not true is fruitless. It does not take much to create a vibration and that cannot be easily seen.
 
1 - 20 of 26 Posts
Top