I need to figure roll center and roll axis when you add in a panhard bar to the mix. Anyone have formulas/diagrams they want to share?

with a 5 link it is a lot more complicated, unless the the upper and lower links are equal length and parallel to each other. This is because it is staticly indeterminant, which is just an engineering term for "it binds" so to find the roll axis you have to look at the bushing and link deflections etc. To get a rough idea you can look at the drawing I made that Pig posts all the time and see what the roll axis would be without the banhard bar. And then the one other piece of info you need to know is that the roll axis must pass through the midpoint of the panhard bar. Knowing this might help you to position the panhard bar to minimize binding.

But why are you messing with a five link? five links are done by engineers at big auto compaies trying to design in the right amount of bind so they can save money by not using a swaybar. Usually by the time the vehicle is released they realize that they need the swaybar anyway.

I am trying to get rid of one, but I want to map out a baseline before I start changing things around.

if the PH bar is the sole axle locating device IIRC where the bar crosses chassis cntreline is consider RC

So did what I said make sense? got the info you were looking for? If you lay it out like it was a four-link and add the panhard bar constraint, you will get a pretty good idea of how it works.

Thanks Gordon that was what I was looking for. I also found this link http://community.webshots.com/album/13190727rhRhHDXluW
that had some good info as well as a couple of diagrams. Now I have a lot of measuring and drawing to do.