Rear coilovers on supers

[evilC]

Originally Posted by $aint

Sorry, my post was inclomplete again, I ment single shear on the trailing arm, since the upper mount can be made into a double shear mount.
Anway, thanks for your answer!

Why does the bolt in the alloy arms work in cantilever (and why doesn't it with the stock arms?)
Is the damper under a different angle compared to the stock arm?

And only the topmount is of concern, since it's the one that gets a bending load?

The steel trailing arm can be fabricated with thin metal to create a two sided cup that supports the bottom bush of the damper. The alloy arm is a complete casting and to creat a double sided support would be difficult without adding fabricated bits. Since the loads are relatively small through the damper (only) mount having a single cantilever bolt is no great problem. I don't think the angle of the damper changes between steel and alloy trailing arm.

The bending load is in both bolts equally but the bottom bolt of the alloy arm is M14 and the top bolt is M12 a difference of 36% in bolt strength but the M14 is a longer bolt and therefore the bending moment is greater (PL/4).

evilC