QUOTE(SLITS @ Feb 16 2009, 04:01 PM)
[ So, to achieve the same effective rate of torsional resistance, you increase the diameter of the bar with a shorter arm.
OK some days I am more mathematically challenged that others but I can't make this work in my head.
On an adjustable thru-body sway-bar:
If you move the drop link closer to the sway-bar pivot point (shorten the arm length) you stiffen up the sway-bar.
If you install a larger diameter bar and leave the drop link position the same you stiffen up the sway-bar.
So if you are saying that an under-body bar is similar in torsional resistance to a thru-body bar and we know the under-body bar is large in diameter then the arm length on the under-body bar needs to be longer than the thru-body arm. I don't have an under-body bar to measure but I do have a stock 914 and a 19mm adjustable thru-body bars that I could measure.
So I am confused
Under-body sway-bars are not adjustable in either torsional resistance or pre-load but with a good set of matching in rear springs an under-body sway-bar can be a nice set up on a street 914.
Since I can't leaving anything alone (got to tinker) an adjustable thru-body bar is my only choice and the geometry of the thru-body bar is much better than the under-body bar.
Jim