#1  
Old 11-15-2010, 12:46 PM
Kenth's Avatar
Kenth Kenth is offline
Ultimate Warrior
 
Join Date: Feb 2003
Location: The Kingdom of Sweden
Posts: 6,096
Default Wheel

Hi all!
Just got my 1991 GP/SE from the wheel shop wich i supplied with the alignment specs (in degrees?) from the original manual, they didn´t have these.

Rear wheel alignment specificatons (service setting):
Camber +.5°
Toe (total) -.10°

Front wheel alignment specs.:
Camber +.7°
Toe (total) 0°


So over to my question, is this an acceptable adjustment (minutes?)?
I´m somewhat concerned with the camber in front and rear toe?

REAR
toe left -00°03´
toe right -00°05´
toe total -00°08´

camber left +00°35´
camber right +00°40´


FRONT
toe left +00°00´
toe right +00°01´
toe total +00°01´

camber left +00°06´
camber right +00°30´
difference -00°24´

caster left +02°42´
caster right +02°47´
difference -00°05´

Thank you!

  #2  
Old 11-15-2010, 03:39 PM
Lightfoot's Avatar
Lightfoot Lightfoot is offline
Chief Ponti-yacker
 
Join Date: Jan 2009
Location: The Banana Republic
Posts: 933
Default

If I knew what portion of a degree 30' (minutes) is, I could give you an opinion.

If it takes 60' to make one degree, then you have +0.5 degree on the right and +0.1 degree on the left. That is not bad. Left is 0.6 from desired, but I wouldn't worry about it unless you experience premature tire wear on the outside portion of that tire's tread.
If the driver sits on the left side, the LF will lean a bit more positive and RF a bit more negative, so it balances out better.

The rear toe measurement of .08' is a smidge over .125 degrees, if I am translating minutes correctly. That's a small bit inside of desired, but probably within tolerance.
Rear tires are much more forgiving of poor alignment settings anyway.

I am used to TOE-IN specs in inches, not degrees. Without knowing what a degree of toe-in translates to, I would guess below .5 degrees is not excessive.

  #3  
Old 11-15-2010, 05:41 PM
Kenth's Avatar
Kenth Kenth is offline
Ultimate Warrior
 
Join Date: Feb 2003
Location: The Kingdom of Sweden
Posts: 6,096
Default

Thanks for the respond!

Yes, minutes divided by 60 is degrees and degrees multiplied with 60 is minutes.

My car runs straight so i guess iīm fairly good then even regarding thread wear?

  #4  
Old 11-15-2010, 07:46 PM
Lightfoot's Avatar
Lightfoot Lightfoot is offline
Chief Ponti-yacker
 
Join Date: Jan 2009
Location: The Banana Republic
Posts: 933
Default

Quote:
Originally Posted by Kenth View Post
Yes, minutes divided by 60 is degrees and degrees multiplied with 60 is minutes.
That appears to be the opposite of what I was thinking: 60 minutes=1 degree.
To put it another way, let's take the Caster measurement +02*42'
I presumed that to read two degrees, forty-two minutes. Is that correct? I made that presumption because 2 degrees would be a very typical caster reading. (except I don't figure minutes readily).

Anyhow,
I wouldn't expect you to have any unusual tire wear with the readings you posted.
FWD cars naturally wear the front tires out much faster than the rear tires. It's just the nature of the beast. I just keep passively inspecting them, and rotate whenever it becomes easy to tell the difference between front & rear wear.
85% of people never rotate their tires and wear the fronts out before the rears have 5/32 gone.

  #5  
Old 11-16-2010, 06:59 AM
Kenth's Avatar
Kenth Kenth is offline
Ultimate Warrior
 
Join Date: Feb 2003
Location: The Kingdom of Sweden
Posts: 6,096
Default

Thanks!
Yes thatīs correct, the Caster measurement +02°(degrees)42'(minutes) converts to 2,7° degrees.

Specīs calls for 2.0° +-0.5° caster.

Reply


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 10:27 AM.

 

About Us

The PY Online Forums is the largest online gathering of Pontiac enthusiasts anywhere in the world. Founded in 1991, it was also the first online forum for people to gather and talk about their Pontiacs. Since then, it has become the mecca of Pontiac technical data and knowledge that no other place can surpass.

 




Copyright © 2017