326 M Sport Alloys. Sure you don't want to hear this

  • Thread starter Thread starter Anonymous
  • Start date Start date
I've just been thinking, when the damaged wheels have been examined how did they decide what caused the crack? Its all well and good saying fatigue or mechanical impact - but I will lay Lincoln odds that they have have not done a proper engineering /metallurgy test at a dealership - Ie looking for inclusions or voids. These things are Die Cast and from past experience albeit many years ago in that industry, cracks and flaws can and do occur. Casting temperatures slag inclusions amongst other things can effect the final product Then of course there is the subsequent heat treatment process to consider.

Visual inspection is only a part of determining the cause of fracture. The true reason will require a proper investigation.

An inspectors hunch doesn't cut the mustard with me!
 
They check the roundness of the wheel, this indicates, theoretically if you have damaged the wheel by kerbing.
 
I think they are grasping at straws!
What run out is within tolerance - It must be documented. Or ask them to inspect a new one.

Fracture lines happen for a reason and not just mechanical impact but if they insist that it is kerb damage - ask them to do the sums on a two scenario's

ie say I hit a 50mm deep pothole at 150mph or a 70mm high kerb at 2mph - I bet they couldn't show you their calcs!

If they can play a hunch game so can we it is equally valid I would say.
(and no I haven't done the sums!)

I'm getting ready for a fight I hope I don't have! :D
 
If you have legal expenses in your insurance, most do, lawyer up. There's enough background material on this and other BMW forums to show that these wheels are duffers.
 
Its just the engineer coming out in me!

I'm sure there's thing to worry about. I really do hope so.

As you say, if the worst happens, there is shed load of evidence in the system.
 
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