Sooo, this just happened,, Alpha rear arm break

[thump426er]

Just noticed this. Cracked on both sides. Note that at full compression top of arm where crack is (#25 on alpha microfiche) does not contact the idler arm (#33) and it does not contact anything at full extension either, which is where it would appear the damage would be coming from. But without it actually contacting anything seems a very odd break, wouldn’t believe that part of arm is under any load.

 

[Old & slow]

Just noticed this. Cracked on both sides. Note that at full compression top of arm where crack is (#25 on alpha microfiche) does not contact the idler arm (#33) and it does not contact anything at full extension either, which is where it would appear the damage would be coming from. But without it actually contacting anything seems a very odd break, wouldn’t believe that part of arm is under any load.

Could it be from ice build up?

 

[knh208]

Looks like a torsion failure. That bit sees lots of side load and twisting load.

Sent from my SM-G960W using Tapatalk

 

[summ8rmk]

It hit at full extension. U can see right above ur yellow circle.
Question is why did it extend so violently to break?

Sent it

 

[Coldfinger]

In the second picture there is some paint chipped off of the tubular arm as if it did contact it at some point. Maybe at a time when the track was too loose, letting the suspension drop too far?

My second guess is like previously suggested, maybe ice buildup, or a combination of ice buildup and a defective part (ie: the metal might normally break any ice without issue but if there was a defect in the metal it may not have been strong enough to break the ice).

 

[zal]

There’s another guy on Snow and Mud that has the same issue.

 

[Wheel House Motorsports]

Seen it happen to a few sleds. Little cast piece that is constantly getting slammed into when you become airborne and skid locks open abruptly. Its not necasarrily designed to act as a stopper, but once bushings wear in a little, it contacted on the sleds i was seeing. Also like mentioned above, if ice falls in it acts as a little crusher and the tubing and ice obviously win over time. One of the many applications of a casting in that skid which are seeing failure under regular use.

Nice thing to catch before it fails, luckily it is a quick easy fix.

 

[ak]

tki was going to make that piece last year but I don’t think anything happened. There were a few on Facebook that had the same thing happen.