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Old 10-13-2007, 07:29 PM
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Rotor Balancing

I have a Mustang II front suspension and have had a vibration in the front for a long time. I have had different wheels (balanced ) and different/new or rebuilt suspension parts on the front. I have always had the vibration at about 70mph.

I feels like it is coming from the passenger side front.

Well today I had the wheel off and I noticed a clip in side the fins of the rotor in one area. It looks like it was placed there from the manufacturer. Now I am thinking Did this clip throw the balance off???

Have you guys seen or heard of this type of thing? Could this be my problem? Should I buy new rotors?

Thanks
Tim

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Last edited by evltwin; 10-13-2007 at 07:41 PM.
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Old 10-13-2007, 07:52 PM
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It would take a little time....but you could switch sides with the rotors and see if the vibration changes sides...they you would know for sure if its the rotor or not. I have seen bad rear axle bearings where the vibration would travel up the frame rail and make you think it was coming from the front also.
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Old 10-13-2007, 07:58 PM
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I had a car with a broken engine mount that i was unaware of that caused a high speed vibration in one of my past cars
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Old 10-13-2007, 08:14 PM
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Check the lateral runout of the rotor hub with a dial indicator. Could possibly be warped from improper torquing.
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Old 10-13-2007, 08:45 PM
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OK but what about the clip in the rotor fin?

It looks like the manufacture put int in. Maybe to "fix" a poorly cast fin??

The clip has one flat side which rests on the long face of the rotor fin then it wraps around the outside edge and travels along the backside of the fin. It then it turns about 170 degrees to from a tang contacting the fin next to it. It definatly looks like it was installed from the manufacturer. Would this throw the balance off? Or did they put it there to balance the rotor? They are just stock style Granada rotors.

Has anyone seen this before? Why is it there?
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Old 10-13-2007, 08:47 PM
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Rear bearings are new. Engine mounts are good.

Rear leaf spring bushings could stand to be replaced.
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Old 10-13-2007, 08:54 PM
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I've seen those weights before. Rear drums have them also. Take it to an automotive machine shop and have it balanced if you think it's causing a vibration. Don't remove it yourself unless you are able to check the balance.

Or do as Henry suggests and swich sides and see if the vibration moves.

Also, you could have a tire that's out of round or has some belting issues. Check the date code. Some "new" tires are messed up from being stored improperly. A really good tire shop has a machine that will be able to load the tire and check that for you.

later, mikey


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Old 10-14-2007, 06:05 AM
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I have checked drums and rotors on a wheel balancer. Yes the weight you see there is a balance weight from the factory. Lots of rotors have them.
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Old 10-25-2007, 07:45 PM
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Mikey is right.

Have you tried different tires? Unless that rotor clip is an ounce in weight, as close to the hub as it is wouldnt make that much difference.
Better tire shops have what's called a Hunter Road force balancer.
Its more than just a spin balancer. I could put a square tire on a spin balancer and get it to finally balance out. Once that tire touches the road it's a whole different story.
The road force machine presses a drum against the tire to "feel" for soft or hard spots in the tires tread area.
Its not uncommon to see a 20lb variance on these machines. (normal on larger tires)
As this hard (or soft) spot hits the pavement it can feel like a vibration.

-Art
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Old 10-28-2007, 12:19 PM
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I have had the tires balanced several time. This is also a different new set of tires and wheels on the car. I have ruled out the wheels and tires.

I am thinking the fins in the rotors are rusting and scaling and the rotor wieght is not so that may be why I feel it more now than orginally. As the rust and scale removes wieght from the rest of the rotor the rotor wieght remains the same wieght.
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