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Question about LM halfshaft/axelshaft
Posted by: Murphy ()
Date: April 01, 2021 10:41AM

Do people balance the halfshaft on our cars? Is it something that is do-able?
Reason I ask is I have had several sets of tires and wheels on my '65 Monza, and there is always a vibration on right side of car starting about 50mph.

Right now I have a set of 15 inch rally wheelswith new tires and, vibration is still there.

All rubber on car , motor mounts, bushings, etc. have been replaced.

I'm running out of ideas.

Murphy

65 Monza Coupe
61 500 Coupe-W100181
Earliest '61 Alive?





Edited 1 time(s). Last edit at 04/01/2021 10:42AM by Murphy.

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Re: Question about LM halfshaft/axelshaft
Posted by: Phil Dally ()
Date: April 01, 2021 10:46AM

The axle could be bent...have you tried a different axle?

Also the u-joints could be worn possibly causing the shake.

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Re: Question about LM halfshaft/axelshaft
Posted by: MattNall ()
Date: April 01, 2021 11:11AM

As Joel recently showed check the Balance of the brake drum only Old bubble balancer will show you. Any tire shop with newer balancer and a grinder can balance it.

!/2 shafts can are balanced by local Driveline shops.

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Re: Question about LM halfshaft/axelshaft
Posted by: Murphy ()
Date: April 01, 2021 04:37PM

Phil Dally Wrote:
-------------------------------------------------------
> The axle could be bent...have you tried a different axle?
>
> Also the u-joints could be worn possibly causing the shake.



No, I haven't tried a different axel. U-joints fairly new.
Swapping side to side might show something. We'll see.

65 Monza Coupe
61 500 Coupe-W100181
Earliest '61 Alive?


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Re: Question about LM halfshaft/axelshaft
Posted by: jjohnsonjo ()
Date: April 01, 2021 05:06PM

Did you swap shocks side to side?

J.O.

65 Corsa Turbo Vert
79 Honda XL 500S
69 Honda CL 160 D
2010 BMW F 650 GS
2003 Bounder 36D
2013 KIA Optima SX turbo-AKA ZIPPY (wife,s car)
69 Newport Holiday Sailboat
Baja 150 dune buggy cart
Coleman HS 500 UTV
2016 KIA Sorento SXL Turbo

Bethlehem,Pa


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Re: Question about LM halfshaft/axelshaft
Posted by: Phil Dally ()
Date: April 01, 2021 06:04PM

Now I remember v8vair chased a shake in his racecar that was a brake drum like Matt said.

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Re: Question about LM halfshaft/axelshaft
Posted by: v8vair ()
Date: April 01, 2021 06:11PM

I found my drums way out on the early racer, I first checked them on my bubble balancer and I’d couldn’t believe how bad they were so I took and checked them on a flywheel/crank balancer . That was one of the vibrations cured !

1965 Crown V8 Racer
1964 Bill Thomas Monza Replica Racer
1964 Spyder Street Car
1979 Mazda RX7

Mike Levine

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Re: Question about LM halfshaft/axelshaft
Posted by: v8vair ()
Date: April 01, 2021 06:16PM

The factory weight was wrong ! it was easier to drill the weight off than get the weight off

1965 Crown V8 Racer
1964 Bill Thomas Monza Replica Racer
1964 Spyder Street Car
1979 Mazda RX7

Mike Levine



Edited 1 time(s). Last edit at 04/01/2021 06:16PM by v8vair.

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Re: Question about LM halfshaft/axelshaft
Posted by: AZ Troy ()
Date: April 01, 2021 06:40PM

You drilled a lot of holes. That drum was not even close to being balanced. I would never thought one would be that bad.

Thanks for posting.




.
v8vair Wrote:
-------------------------------------------------------
> The factory weight was wrong ! it was easier to drill the weight off than get the weight off

Troy G. / Scottsdale Arizona

'65 140 Corsa Coupe
'66 140 Corsa Coupe - Crown Converted in the '60's

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Re: Question about LM halfshaft/axelshaft
Posted by: RobertC ()
Date: April 01, 2021 11:18PM

Bent trailing arm? - or whatever it is called.

Assume you have had a 4 wheel alignment done?

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Re: Question about LM halfshaft/axelshaft
Posted by: irfgt ()
Date: April 02, 2021 02:44AM

I have never seen an axle cause a vibration. It's low speed and small diameter would be not a likely source of a vibration.

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Re: Question about LM halfshaft/axelshaft
Posted by: BobV66Vair ()
Date: April 02, 2021 06:57AM

Get a pair of half shafts made out of aluminum. They are much lighter and therefor have less mass to vibrate. of course they run about $300 or more each!

66RTVair
Oregon
1965 Corsa 140 stock
1966 Monza DP Racecar
1968 Monza Parts for now

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Re: Question about LM halfshaft/axelshaft
Posted by: American Mel ()
Date: April 02, 2021 04:42PM

I have heard of guys unbolting them, rotating 180 degrees and bolting back up, to cure some issues.

irfgt Wrote:
-------------------------------------------------------
> I have never seen an axle cause a vibration. It's low speed and small diameter would be not a likely source of a vibration.

Low Speed? confused smiley
They are turning just as fast as your wheels are!
Or did you mean Low Mass and small diameter?

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Re: Question about LM halfshaft/axelshaft
Posted by: toms73novass ()
Date: April 02, 2021 05:06PM

I think he ment in comparison to a standard driveshaft which turn 2.7-4 x faster than the wheels.

At 3500 rpm in final gear our half shafts are only turning at about 1000 rpm depending on diff ratio, compared to 3500 for a solid axle rear end's drive shaft.

-Tom


63' Monza Spyder Convertable (in process) MY Build Thread
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