<VV> VirtualVairs Digest, Vol 145, Issue 2

Sat Feb 4 17:16:21 EST 2017

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Today's Topics:

  1. LM alignment (James Cuneo)
  2. Re: LM alignment (FrankDuVal)
  3. Re: LM alignment (BBRT)

----------------------------------------------------------------------

Message: 1
Date: Sat, 4 Feb 2017 02:43:46 +0000
From: James Cuneo <jamescuneo at hotmail.com>
To: "virtualvairs at corvair.org" <virtualvairs at corvair.org>
Subject: <VV> LM alignment
Message-ID:
    <CY4PR1601MB1272224389263735DBBDB509CD4E0 at CY4PR1601MB1272.namprd16.prod.outlook.com>

Content-Type: text/plain; charset="iso-8859-1"

For you Alignment pros,

After rebuilding front suspension with all new parts  including their hd springs from Clarks, I took it to be aligned today. The technician called me out to show me that the strut rod nuts were bottomed on the threads before the desired caster angle had been achieved. Effectively he had shortened them as far as they would go. I had requested +4 deg. The most he could get was + 1.9 deg. I thought that he was adjusting the rod in the wrong direction but the computer definitely showed increasing caster angle with shortening of the rod. This is contrary to what I understand about caster and the chassis manual as well. Also, at this caster angle he could not get the toe close to correct, the sleeves bottomed on the tie rod ends. So, he backed off the caster until he could get  the toe in close. The final numbers are camber .8 deg. caster .3 deg and toe in .32 total.

Alignment rig is a Hunter brand laser digital.

Car drives straight and does not track on grooves like it did before

Steering effort is lighter than before indicating less caster.

Not sure but, I think somethings not right?

Jim C. 1965 Corsa

------------------------------

Message: 2
Date: Fri, 3 Feb 2017 23:10:18 -0500
From: FrankDuVal <corvairduval at cox.net>
To: virtualvairs at corvair.org
Subject: Re: <VV> LM alignment
Message-ID: <4881e311-c22c-a456-10e7-dc5d81b3484b at cox.net>
Content-Type: text/plain; charset=windows-1252; format=flowed

I'm not a pro, but sort of understand it from my years pulling bodies 
back into alignment.

Something not right? Yes!

First, why did you want +4 on Caster? Special use, not everyday driving? 
Shop manual says 2 +/- 1/2.

Also, shop manual says lengthening the rod increases Caster! Just like 
you thought. Figure 3-5 of the 65 manual.

The Caster can also be adjusted, like an early model, by using unequal 
shims on the upper control arm.

You sure he wasn't looking at data of a Chevelle or other Chevy where 
the strut rods go forward from the lower control arms? Most GMs do that.

Find someone who actually understands alignment, typically the guy with 
a tram gauge and string! Maybe some old Bear or Bean equipment.

Light steering effort good! Steering wheel not returning to center after 
the turn is bad.

Frank DuVal

On 2/3/2017 9:43 PM, James Cuneo via VirtualVairs wrote:
> For you Alignment pros,
>
> After rebuilding front suspension with all new parts  including their hd springs from Clarks, I took it to be aligned today. The technician called me out to show me that the strut rod nuts were bottomed on the threads before the desired caster angle had been achieved. Effectively he had shortened them as far as they would go. I had requested +4 deg. The most he could get was + 1.9 deg. I thought that he was adjusting the rod in the wrong direction but the computer definitely showed increasing caster angle with shortening of the rod. This is contrary to what I understand about caster and the chassis manual as well. Also, at this caster angle he could not get the toe close to correct, the sleeves bottomed on the tie rod ends. So, he backed off the caster until he could get  the toe in close. The final numbers are camber .8 deg. caster .3 deg and toe in .32 total.
>
> Alignment rig is a Hunter brand laser digital.
>
> Car drives straight and does not track on grooves like it did before
>
> Steering effort is lighter than before indicating less caster.
>
> Not sure but, I think somethings not right?
>
> Jim C. 1965 Corsa

------------------------------

Message: 3
Date: Fri, 3 Feb 2017 22:30:04 -0500
From: "BBRT" <chsadek at comcast.net>
To: <virtualvairs at corvair.org>
Subject: Re: <VV> LM alignment
Message-ID: <000c01d27e96$fad960f0$f08c22d0$@net>
Content-Type: text/plain;    charset="us-ascii"

Did you loosen stabilizer bar? In case it was restricting the adjustment.

Do you have the upper control arms possibly switched side to side? 
Normally the strut rods-if you mean the brake reaction rods/castor control
arms, the bushing is centered more or less, therefore nuts are roughly
centered in the threads, front to rear.

Find someone with an old fashioned camber/castor gage that fits on end of
wheel bearing hub over or instead of grease cap, or make a big washer
extension and check the turning front to rear, etc. That would give you a
feeling that the guy is right (although I can't imagine why he wouldn't be
right). But, it gives me a good feeling with a coarser measurement for
confirmation. :>)

Let us know what the real answer is.

Chuck S

-----Original Message-----
From: VirtualVairs [mailto:virtualvairs-bounces at corvair.org] On Behalf Of
James Cuneo via VirtualVairs
Sent: Friday, February 3, 2017 9:44 PM
To: virtualvairs at corvair.org
Subject: <VV> LM alignment

For you Alignment pros,

After rebuilding front suspension with all new parts  including their hd
springs from Clarks, I took it to be aligned today. The technician called me
out to show me that the strut rod nuts were bottomed on the threads before
the desired caster angle had been achieved. Effectively he had shortened
them as far as they would go. I had requested +4 deg. The most he could get
was + 1.9 deg. I thought that he was adjusting the rod in the wrong
direction but the computer definitely showed increasing caster angle with
shortening of the rod. This is contrary to what I understand about caster
and the chassis manual as well. Also, at this caster angle he could not get
the toe close to correct, the sleeves bottomed on the tie rod ends. So, he
backed off the caster until he could get  the toe in close. The final
numbers are camber .8 deg. caster .3 deg and toe in .32 total.

Alignment rig is a Hunter brand laser digital.

Car drives straight and does not track on grooves like it did before

Steering effort is lighter than before indicating less caster.

Not sure but, I think somethings not right?

Jim C. 1965 Corsa

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End of VirtualVairs Digest, Vol 145, Issue 2
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