Thread: Please don't...
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Old 11-15-2012, 06:53 PM   #32
Scooby Newbie
Member#: 190479
Join Date: Sep 2008
Chapter/Region: NESIC
Location: Ashburnham, MA
2015 XV Crosstrek
2012 Impreza- Deep Cherry


Originally Posted by Garandman View Post
The center of the rod doesn't do much of anything except add weight.

Whiteline white paper.

Well I think you have to read the whole piece:

Tube torsion members can be used successfully as swaybars with some benefit in weight reduction. As an example, 2 individual, rate equivalent (approximately), common sized generic bars 1100mm long with 300mm blades, one solid 24mm the other tube of 25.4 x 3.96mm (1 x 0.156) gives a weight reduction of about 2.5kg with about 200g of that as unsprung
mass per wheel.

However the downside to these is the increase in stress levels for equal OD or rate, and therefore reduced strength. Also the complications seen in manufacture swaybars from tubular medium, and the importance of geometric control under bending make these more difficult and expensive to make. The attachment points at the blades can also be a problem with these swaybar designs.

The additional complications and downsides of hollow bars seem to outweigh their advantage in overall weight and unsprung mass, which can be seen to only be marginal in street car application. Even OE manufacturers rarely use this type of design in their
swaybars. However with the right conditions and setups, they can bring some gain in racing situations, which can require weight reductions to the gram.
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