Rhythmic vibration above 65

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Oct 4, 2022 | 07:28 PM

#21

grinder11

Race Director

Joined: Oct 2004

Posts: 12,861

Likes: 4,664

Quote:

Originally Posted by jim993

Get a good balance of all four wheels/tires. Make sure the tech watches each for out of round tires or bent wheels. Tires on bent wheels can be balanced but still cause a vibration from out of roundness.

Good advice, and I'd like to add that a good wheel balance includes "road force." IDK exactly what that means, but as you said, Jim, it will expose a bent wheel pretty quickly.......

Oct 4, 2022 | 07:35 PM

#22

grinder11

Race Director

Joined: Oct 2004

Posts: 12,861

Likes: 4,664

Quote:

Originally Posted by SilverC5guy

No and no, I just find it hard to believe that 4 different tires and nothing would change. I have zero shake in the steering wheel, its still in the exact same spot and still improves after driving for 30 minutes or so. Something is getting warm and exapnding with heat to improve it.

How about an over the axle exhaust pipe making just enough rhythmic contact where it shouldn’t? This happened to me on the passenger side, and I had a Hell of a time finding it, even with a lift!

Oct 7, 2022 | 03:49 PM

#23

gpracer1

Le Mans Master

Joined: Feb 2006

Posts: 5,267

Likes: 40

From: Phoenix AZ

If mine sits for a week with those soft 140 treadwear tires, I leave at 4 am when they are cold and the flat spots will do that rhythmic deal till the tires warm up and lose the flat spot. In a long sweeping turn it will change the frequency and outside tires change sync with inside.

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