[Jazzbass]

In the front of a torsion bar 911, if you change the ride height it changes the camber of the wheels. Lower = more negative, raise = more postive.

Question is, does anyone know what happens to the alignment in the rear if you raise or lower the car using the eccentric ride height bolt on the factory adjustable sptring plates? Assume that none of the other bolts on the spring plate or trailing arm are touched in any way.

[matt de maria]

Camber changes same way. Toe changes a little.
The intent of the eccentrics was to fine tune left and right adjustment. The eccentrics were set in the middle nominally. Altering adjustment would change spring blade declination + or - 1/2 degree.
When torsion bars get real old they will stretch beyond their normal setting. You will not be able to get an exact equal setting on the left and right side. You can adjust one (or both) eccentric(s) to exactly equalize the angle drops.
Also in terms of lowering you will only get about 3 to 5 mm change.

[Jazzbass]

Thanks for the excellent info, Matt. The reason I asked was I was thinking about bringing the back of my car up a little - about 1/4", but didn't want to if it would completely screw up my alignment. BTW, the tbars in the rear are brand new 28mm.