View Single Post
      01-10-2011, 05:39 AM   #6
1QuikWS6
No 55mph
 
1QuikWS6's Avatar
 
Drives: 09 E92 328iX N51 3-Stage
Join Date: Jul 2009
Location: Blitzburgh, PA

Posts: 4,505
iTrader: (81)

Garage List
Have they ever done an FEA Analysis of the slotted areas with the integral thru holes to see anticipated stress and breaking point at the very thin web that is left?

I understand the concept and the reason for this design, but in the case of just slots alone - the slots may be 1/16" deep out of the total 1/4" thich rotor surface, or in the case of thru holes alone, you still have the total 1/4" thickness - weak point would be between the holes.

But with this design, you have the depth of the slots (which looks to be more than 1/16") and then they drill out the web thickness that is leftover even more with the thru holes - resulting in a very thin web that is actually left between the holes at the bottom of the slot.

These areas will be very prone to cracking in the thin web area between the thru holes in the slots. You may get away with it on street only brakes - but I wouldn't use them for continous hard track use without having the results of the FEA prove a safety factor of at least '4'

I also understand the concept behind the centrally located hat mounting tabs - so that you can switch the directional rotors side for side - but why would you want to?

Only reason I can think of is if say you had a damaged right rotor - you could swap over the left rotor and only need to buy (1) replacement rotor - but normal practice is to replace rotors in pairs...

Not tryin to bash their design - just throwin some observations out there.
__________________
2009 328ix E92//SGM//ACS Roof Spoiler//MTech Aero Lip+Trunk Spoiler//M3 Side Skirts//CF Roundels+Grilles//M3 Novillo Interior//Perf Shift Lever+Boot//MPerf DCT Wheel//M3 GT3 eBrake Handle+Boot//ACS Pedals//M3 Mirrors//LCI Tails w/LUX Rev//DTEC V7 AE+MTec 6000K D1S+HPB HID 6000K Fogs//HPB LED Interior//RPI Scoops//CF Euro Airbox+Underhood Hsgs//K&N//BMW PE//MTech Rear Bumper-iS Sport Diffuser//CF Strut Brace//Vishnu OFT//BMW 193M's+Kumho 4X

Last edited by 1QuikWS6; 01-10-2011 at 06:08 AM.
1QuikWS6 is offline   United_States
0
Reply With Quote