[ASKay]

Originally Posted by h0m3sy

The car is brand new, wishbones all move freely, I was told to remove the nut as it can, as you said tighten itself, causing some binding. Just came across this from the Belgian GP this year involving Derek McCloskey from Ireland "A manufacturing error known as cold-shock was evident when a front wishbone on Derek’s CAT broke without warning. Phil Booth from Schumacher explained that this effect was extremely rare but was known of." Seems there is a problem with this.

I have designed for plastics and do not know the term 'cold shock' unless it is an RC term or an Americanism I am assuming they mean a brittle failure due to cold temperatures (i.e. cold morning), the technical terms if so is referred to as being at the brittle end of the ductile-brittle transition temperature. This is likely to be even more sensitive for materials with a high carbon content, such as wishbones.... some high carbon plastics are brittle at 60 - 70 degrees C, but also are very stiff....

Unlikely to be a manufacturing error, however if material was not packed suitably in the cavity of the tool or there was a weakness (plastic not fused) on a weld line within the moulding then this could cause a failure and would be a manufacturing error.