I think you are right Tracy the angle can be accomodater for nicely, I think the issue will be a lateral translation at that mount - a sideways motion unless you accounted for it somehow. As you lengthen the rod, the strut rod mount will want to move outboard - pivotting around the lca heim. Prrhaps there is enough slop in the mount hole to accomodate the movement, i certainly have not done the math. It would be a simple enough calc. Essentially, as the strut rod gets longer, the distance between the heims also gets longer.
Again, i love the idea...
I'll try to explain in more detail.
The front strut rod frame mount and the inboard LCA mount are the only fixed points. The strut rod angle at the Strut Arm is fixed, but the ball joint isn't. The ball joint location is defined by the adjusted length of the strut rod and the LCA.
I'll start out with the Strut Arm installed with a neutral LCA that is perpendicular to the frame and there is no offset angle at the strut rod heim and no offset angle at the spherical bearing.
As the strut rod is lengthened, the LCA moves back and the ball joint moves back and in following an arc as it pivots around the spherical bearing, the offset angle of the heim will become non-zero and the offset angle of the spherical bearing will become non-zero. Lets say for clarity the offset angles are positive from neutral for this case. The strut rod does not bind, because the Strut arm is pivoting at the spherical bearing. The approaching angle of the strut rod to the front does change resulting in an offset angle at the heim joint.
Back to neutral. As the strut rod is shortened, the LCA moves forward and the ball joint moves forward and in following an arc as it pivots around the spherical bearing, the offset angle of the heim will become non-zero and the offset angle of the spherical bearing will become non-zero (for this case lets say the angles are negative from neutral). The strut rod does not bind, because the Strut arm is pivoting at the spherical bearing. The approaching angle of the strut rod to the front does change resulting in an offset angle at the heim joint.
There will be no bind unless I were to exceed the maximum misalignment angles which are 14 degrees or if the hardware were to interfere with some other part of the car. If I were lengthening the strut rod, I'd have to move the ball joint back over 3 inches to reach an offset angle of 14 degrees at the spherical bearing, but before I got it moved back that far, the strut rod would run out of adjustment...no one moves their wheel back over 3 inches...that would be more than 23 degrees of castor...
Even if it could move it back that far, the strut rod would start to interfere with the sway bar before i got it moved back that far. Same kind of story if I were shortening the strut rod...no one moves their wheel forward over 3 inches...23 degrees of castor anyone?
Here is a pic of what came off the car when I installed the Strut Arms a few weeks ago:
These adjustable strut rods and adjustable LCAs were on the car for many years. The heim joints are as tight as the day I installed the parts. There has never been any issue with bind with this hardware. Many happy customers who have purchased these separately or together. The strut rod angle is fixed. The Strut Arm is just a melding of both these parts into one.
Hope this helps to clarify the situation