What would cause a vibration at 65 mph? - Vintage Mustang Forums
 
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post #1 of 13 (permalink) Old 05-18-2005, 10:11 AM Thread Starter
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I just put on new tires, had them balanced (twice), and had the front end alighned.
I get a vibration when I get up to highway speeds above 65. I am actually wondering if it could be a u-joint.
The tire guy thinks if it was from the tires not being balanced, it would vibrate long before 65 mph.
What do you guys think? Oh and it's not in my mustang, I am tracing this down in the 86 Monte SS my wife gave me. I would ask this in the cheby forum, but frankly I think us ford guys are smarter...
Thanks...Kevin
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post #2 of 13 (permalink) Old 05-18-2005, 10:42 AM
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If your car didn't vibrate before the new tires then it is the tires. Either they have not been balanced correctly or one or more tires cannot be balanced. It happens. Have your tire shop swap out all four for different ones. And yes, tire vibration can occur at any speed.
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post #3 of 13 (permalink) Old 05-18-2005, 12:06 PM
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I would say tires too! My new tires on my Escort had a vibration at 60 MPH. Rotated tires and vibration was different but still there. Swapped wheels one at a time and found it first try. One tire balanced perfect, but when we put it on the car we had vibration at 60 mph!
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post #4 of 13 (permalink) Old 05-18-2005, 12:11 PM
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I agree with BuckBarker, if the car didnt vibrate before getting the new tires than that has to be it. Otherwise it might just possibly be the u-joints.

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post #5 of 13 (permalink) Old 05-18-2005, 03:01 PM
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MAY WANT TO HAVE YOUR DRIVESHAFT BALANCED....SHOULD BE ABOUT $40

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post #6 of 13 (permalink) Old 05-18-2005, 05:29 PM
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Dismount wheels, examine registers, and re-mount, torquing to correct spec. Road test.

If issue persists, tire shop should first true tires (shaving them on a machine) and re-balance.

I'm assuming the issue wasn't evident before changing tires...

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post #7 of 13 (permalink) Old 05-18-2005, 07:09 PM
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Quote:
Dismount wheels, examine registers, and re-mount, torquing to correct spec. Road test.
What are the registers Never heard that term with respect to wheels.

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post #8 of 13 (permalink) Old 05-18-2005, 08:13 PM
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Registers are machined mating surfaces which locate the wheel concentrically. Some wheels locate with a cone shaped lug-nut, others with a machined surface on the hub and wheel ID. All hubs, regardless of concentric register, locate the wheel longitudinally, so that the wheel rotates in the same plane as the bearings.

It doesn't take much (.010" is significant) at the hub to make the outer OD of the wheel/tire run out considerably, often causing vibration. Also, over-tightening of lug nuts with air impact guns, commonplace at tire stores, can warp the hub/wheel assembly and affect dimensional accuracy.

Hey, thanks for asking.. How's Mrs. Venturi doing?

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post #9 of 13 (permalink) Old 05-18-2005, 09:48 PM
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Thank you for the excelllent description of registers.

Ms. Venturi is doing quite well, as you can see...


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post #10 of 13 (permalink) Old 05-18-2005, 10:24 PM
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Ah, BOM brings a different image to mind (a mileage runner euphemism) but I like your iteration much better Brings back good memories.

Nice to see life is treating you well, Randy...

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post #11 of 13 (permalink) Old 05-18-2005, 10:39 PM
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Get your setup "Speed Balanced". There is a shop here in Charlotte that will speed balance your entire setup (tire, wheel, brake) while mounted on the car. They can balance upto 120mph (IIRC).

Check it out - it makes a huge difference. Only down side...If you remove a tire/wheel you need to reinstall it exactly the way it was on the car before you removed it or you will need to rebalance the combo.

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post #12 of 13 (permalink) Old 05-19-2005, 09:59 AM
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Your tire guy is mistaken. Normally, an imbalanced tire will show up at low speed 45-55mph. But depending on the
how much the balance is off, it may show up at higher speeds.
Example, I had new tires mounted and balanced and had a bad vibration between 60 and 65mph. They spin balanced the tires
again and they found one tire they couldn't completely balance and put on a new one. I have also had tires spin balanced to moved the vibration to over 80mph where I DON'T normally run.

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post #13 of 13 (permalink) Old 05-19-2005, 08:48 PM Thread Starter
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Thanks guys, I didn't get a chance to drive the car before the new tires, on the highway, so I can't be sure if it was there before.
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