[Fot] castor, camber, toe-in and all things mysterious

[MadMarx]

When our cars were young they focused on easy steering. With positive camber
the car has less forces on the steering wheel.
You see even F1 cars with positive camber.

Cheers
Chris

-----Urspr|ngliche Nachricht-----
Von: fot-bounces at autox.team.net [mailto:fot-bounces at autox.team.net] Im
Auftrag von brad.kahler at 141.com
Gesendet: Montag, 2. Juli 2012 19:29
An: fot at autox.team.net
Betreff: [Fot] castor, camber, toe-in and all things mysterious

Ok,

The discussion recently on whether I might have a toe-in problem on my
street TR4 raised a few other questions that Ibm guessing can be answered
by the group.

While doing a little research on the subject I found this interesting
comment from Wikipedia, b
Off-road vehicles such as agricultural
tractors generally use positive camber.b
   Somehow this seemed appropriate,
after all we are talking about cars with tractor engines :)

Looking at the
numbers used by Triumph for the various models:

TR4
Caster = 3 deg +
Camber =
2 deg +
Toe-in = 1/8b

Swivel pin = 7 deg

TR4A/250
Caster = 2-3/4 deg +
Camber = 1/2 deg +
Toe-in = 1/16b

Swivel pin = 8-1/2 deg

TR6
Caster = 2-3/4
deg +
Camber = 1/2 deg +
Toe-in = 1/16b

Swivel pin = 9 deg

Ibm not sure
what the Swivel pin reference means.  Ibve not seen that term used before
regarding the front suspension.

>From reading the archives it seems the most common preference for camber is
-1.5 degrees.  Assuming I managed to get the suspension set to -1.5 degrees
camber what kind of tire wear would I expect to see?  Right now the car does
not have a front sway bar, however I do have one
(Addco) to install.  I just need to find replacement bushings.

If -1.5 is
such a good number why didn't Triumph use that number?

Will adding a sway bar
up front make that much difference for a street use TR4?  Living in Kentucky
there are plenty of roads for me to test the various changes made to the
front suspension!

Coincidentally, while playing with tire pressures the other day I found that
the gauge I had been using (one of those cheap sticks with the rod that pops
out) was reading about 3 psi low.  So when I thought I had 28 psi in the
tires I only had 25.  I didn't realize those sticks were that inaccurate.
Using a digital gauge I've found that 32 psi seems to be a reasonable
number.
Thanks,

Brad
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