Re: "Hooked on Driving" High Performance Driving Experience
Originally Posted by
RED DOG
Here is a photo of the broken Karmen 62mm pulley. . .
AND my damage hood! (my camera does not take good close up photos)
These clutch plates are made from an iron of some form and iron is brittle, that looks like a coarse grained material, they should be a fine grained material. The work hardening can cause it to get coarser grained, I guess there should have been more material from the rivet to the edge of the slots.
Edit
As it started at the rivet I guess it is possible that the load to set the rivet was to high and cracked the material from the rivet hole to the circular lot. The picture of the other failure is strictly a slot failure though.
If the clutch plate hits the magnet first on one edge and then flattens against it because the gap between the magnet and clutch plate are way different from side to side, then perhaps the uneven loading will lead to cracks.
Last edited by onehundred80; Aug 3, 2014 at 10:26 AM.