Single seater anti roll bar fabrication.

[andygo]

I want to make a new anti roll bar for my formula ford 1600. I have the original to copy, but I would like to experiment with different lengths and thicknesses. As a matter of interest, which part is responsible for the torsion - the arms or the part that the arms attach to?

I can get the machining and tig welding done, bu has anyone any idea on what material to use. The existing one uses 12.5mm arms and a 13.5 horizontal bar between the two thicker parts. Best to see picture.

The standard ones do not appear to be heat treated and seem to bend fairly easily, leaving them out of true. If they get heat treated though, how does that affect the stiffness?

Any help gratefully recieved!

Thanks,

Andy