I stand corrected! There is indeed another way that I didn't think about.
Pete & Aprille Chadwell (collectively?) wrote:
> ...He said that he could adjust the castor by
> adding/subtracting shims...
Shimming the front of an A-arm's pivot differently from the rear moves its
outer end forward or backward. So by moving the upper pivot one way and the
lower pivot the other you do indeed change castor. Of course, it also makes
the pivot no longer parallel to the vehicle's longitudinal axis. (I guess I
was stuck on keeping them longitudinal.)
I can see is a minor downside to this. With castor increased this way,
suspension travel will move the upper ball joint forward and the trunnion
backwards just a little as each A-arm moves away from horizontal. So castor
will decrease slightly with any suspension travel, and you will also get a
bit of "pro-squat" instead of anti-squat!
We're splitting hairs on this one, I suspect. If this keeps up I'm gonna'
hafta' go out to the garage and start measuring arm lengths, and then pull
out calculator and...and, aw forget it. :-)
Jim Muller
jimmuller@pop.rcn.com
'80 Spitfire (Percy)
'70 GT6+ (Nigel)
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