| [GMCnet] 1 ton alignment - lessons learned, part 2 [message #137754] |
Sat, 06 August 2011 12:47  |
KB
Messages: 1262
Registered: September 2009
Karma: 0
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Senior Member |
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Ok, here's a thought experiment that's bugging me:
Turn the wheels left, say 15 degrees. Measure the camber on both wheels.
Now turn the wheels right, say 25 degrees past center (40 degrees total). Measure the camber again.
Subtract the two right camber angles from two left camber angles to get relative caster.
In this scenario, we didn't move the same number of degrees right and left, but both wheels
went the same distance -- ie 40 degrees total movement. Since we're not trying
to calculate actual caster, just relative side to side, why wouldn't this work?
I also find it interesting (concerning?) that the alignment shop results people
have been posting do NOT have equal caster. I'm not sure why a shop would choose to
set say 3.4 on one side and 3.0 on the other. Maybe trying to address road crown?
Are they being sloppy, or fancy, or does making caster exactly equal not matter?
Thanks for any insight. I'm still trying to understand the issues.
I realize a really good shop can do a better job, but it appears most shops
are not that good and even a "shotgun and incense" home alignment could often be
a better choice.
Karen
1973 23'
1975 26'
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Karen
1975 26'
San Jose, CA
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| Re: [GMCnet] 1 ton alignment - lessons learned, part 2 [message #137796 is a reply to message #137754] |
Sat, 06 August 2011 21:07  |
midlf
Messages: 2212
Registered: July 2007
Location: SE Wisc. (Palmyra)
Karma: 1
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Senior Member |
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| KB wrote on Sat, 06 August 2011 12:47 |
I realize a really good shop can do a better job, but it appears most shops
are not that good and even a "shotgun and incense" home alignment could often be
a better choice.
Karen
1973 23'
1975 26'
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The shops may be OK for the common auto but I'm not sure. Thus the reason I bought my bubble alignment gauge.
"shotgun and incense", that's an interesting term I've never heard before.
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI
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