Quote:
Originally Posted by $aint
I posted some over here, it's in Dutch though
http://www.keversite.nl/forum/viewtopic.php?f=5&t=16351
(Achterkant = rear)
Is it for steel trailing arms or for 944 Alu trailing arms?
About the single shear:
It's a good point, but in the Käfercup they raced with the single-shear setup and it didn't break. And they did push their cars to the limit. |
To a degree it doesn't matter if its the steel or alloy arm since the connection of concern is the top mount, which is the same for both. The top mount has a single 12mm bolt that is in single shear but also has a significant element of bending that is compounded if the top bush is rubber rather than a ball joint. The shear value of the bolt is well within the bolts capability but it is the cyclic bending that is problematic IMO. Because of this cyclic bending NEVER use a stainless bolt because it will prematurely fail.
the lower mount on a steel arm is actually much better than the alloy arm because the bolt is only in shear, which it can cope with very easily. The alloy arm however, uses a 14mm bolt again in cantilever, this time with a substantial lever arm as the threads are well buried in the housing.
Remember, both VW and Porsche designed these fixings
only to take damper loads that are minimal compared to the loads imparted by a spring.
evilC