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Drivetrain vibration in 1966 Corvair #5339239 02/02/20 03:57 PM
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007 Offline OP
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My good buddy has a 1966 Corvair and has some over 55 mph vibration issues. He has 14" OLD style Crager wheels with 205/70 14 BFG TA Radials. This is the second set of new tires he has purchased in less than a month hoping to alleviate his issue with no luck. Tire installer sold him on the second set of more expensive tires thinking that was the problem but it was not. Any ideas??

Re: Drivetrain vibration in 1966 Corvair [Re: 007] #5339243 02/02/20 04:03 PM
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Rand Offline
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Road force balancing should be able to confirm or rule out tires/wheels.


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Re: Drivetrain vibration in 1966 Corvair [Re: 007] #5339251 02/02/20 04:07 PM
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Have the shop take the tires off and spin the rims first and check for bent ones, and also how far out of balance the rim itself is. Does it feel like it's in the front, rear, or both? If only one end, swap both tires front to back and see if the vibration follows the swap, or if it stays. That will tell you if its wheel/tire related or some other drivetrain/bearing issue.


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Re: Drivetrain vibration in 1966 Corvair [Re: 007] #5339260 02/02/20 04:20 PM
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JHZR2 Offline
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Get a vibration analysis app for your smart phone - I use a free one called VibrationAnalysis. Take a reading at actual 60MPH and another at a recorded actual speed where the vibration is worst.

Verify your tire size’s true rpm/mile rating. From there all it takes is math to determine what in the drivetrain is causing the worst vibration.

https://www.bobistheoilguy.com/forums/ubbthreads.php/topics/4891490/1

Knowing what frequency you’re truly feeling will be helpful.

You’ll get something like this if it’s legit wheel and tire:

[Linked Image from i.imgur.com]

And this when fixed:


[Linked Image from i.imgur.com]

Note the y axis.

When you know the number of tire RPMs/mile, and are at 60MPH, so its one mile per minute, the math starts to get easy.

Since the diff ratio is known, if its that, it will be mathematically the harmonic that is the ratio multiplier of the tire RPM, or more specifically Hz (oscillations/sec).

Re: Drivetrain vibration in 1966 Corvair [Re: 007] #5339270 02/02/20 04:28 PM
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Thanks for the feedback guys. My buddy is very frustrated and does not want to throw good money after bad.

Re: Drivetrain vibration in 1966 Corvair [Re: 007] #5339307 02/02/20 05:01 PM
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Passport1 Offline
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I had a '65 Corvair Corsa 180 turbo, 4 speed with a factory limited slip transaxle. Loved that car. Ran it in many gymkhanas until the engine surrendered. It was shod with 14" Michelin X tires.

The only vibration I remember it generated was from my overheated girlfriend in the passenger seat.


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Re: Drivetrain vibration in 1966 Corvair [Re: 007] #5339332 02/02/20 05:25 PM
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Neely97 Offline
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In high school ( in the late 60s )my friend had a Corvair.
He found that added weight really helped it’s handling.

He had a hundred lbs of barbell weights in the trunk, I remember because he borrowed them from me and never returned them .

Re: Drivetrain vibration in 1966 Corvair [Re: 007] #5339338 02/02/20 05:30 PM
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Trav Offline
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Check the U joints and anything else connected to the drive axles, these types of components are a common cause of vibration.


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Re: Drivetrain vibration in 1966 Corvair [Re: 007] #5339370 02/02/20 06:00 PM
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With a vehicle of that age, it could be nearly any part of the drive train or suspension.
Unless your buddy has replaced the rubber bits within the past 5 years you've got to assume they're worn or dry rotted or both.

There's likely a lot of work to do here.


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Re: Drivetrain vibration in 1966 Corvair [Re: Trav] #5339404 02/02/20 06:28 PM
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GSCJR Offline
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Originally Posted by Trav
Check the U joints and anything else connected to the drive axles, these types of components are a common cause of vibration.

+1


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Re: Drivetrain vibration in 1966 Corvair [Re: 007] #5339420 02/02/20 06:45 PM
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Do the only Cragers have those slotted holes and oblong washers?

Got any stock wheels?

Last edited by DuckRyder; 02/02/20 06:46 PM.

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Re: Drivetrain vibration in 1966 Corvair [Re: DuckRyder] #5339460 02/02/20 07:28 PM
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Originally Posted by DuckRyder
Do the only Cragers have those slotted holes and oblong washers?

Got any stock wheels?


This is what I was thinking.

Re: Drivetrain vibration in 1966 Corvair [Re: 007] #5339509 02/02/20 08:07 PM
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widman would know ....


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Re: Drivetrain vibration in 1966 Corvair [Re: DuckRyder] #5339648 02/02/20 11:49 PM
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Originally Posted by DuckRyder
Do the only Cragers have those slotted holes and oblong washers?

Got any stock wheels?


Those "Uni-Lug" wheels were junk when new, Aftermarket Duplex-washered lug nuts were also trash without Uni-lug wheels thrown in the mix.

If one dismounted the tires & put a dial indicator too these Cragers on the car...I guarantee excessive runout would be found!


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Re: Drivetrain vibration in 1966 Corvair [Re: GSCJR] #5339672 02/03/20 01:20 AM
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Cdn17Sport6MT Online Content
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Originally Posted by GSCJR
Originally Posted by Trav
Check the U joints and anything else connected to the drive axles, these types of components are a common cause of vibration.

+1

If memory serves, the rear half-shafts do not telescope... on the '65 and later (specifically). Meaning that they act as the upper wishbone... or link... and they run in compression. Like how the first few Corvette Stingrays were.... I guess, all the way up to the early 90's ??? The U Joints have to be in good nick. Same as the Jaguar IRS.

Last edited by Cdn17Sport6MT; 02/03/20 01:21 AM.

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