Reproduction 2 piece rotor review

[Mike S]

 When I get around to it I'll see about swapping the hubs that came with the rotors with the original ones. I'm sure (at least hoping) the bolt holes will line up.

Mike

[x66 714]

I'm glad you opened this discussion. It certainly has brought out some interesting point. I for one will be looking forward to your finds Mike. I need to get X66 714 back on all fours again but I'm not in so much of a hurry after reading some of the points here...Thank you, Joe

[Mike S]

Hi Joe,

  I'll look at changing it this weekend. I'll closely compare the grain structures and even give it the "ping" check. I'll also weigh the two hubs to see if there is a difference.

Mike

[Kelley W King]

Talk about going to school, Bergy is the bus driver.

[JKZ27]

Great read, Bergy! Thanks.

[Mike S]

 I verified that the original hubs can be mounted on the reproduction rotors.
The original hub fit snug into the reproduction rotor (as well as the reproduction hub) so they are obviously machined the same.
I held both hubs (minus the rotors) by a lug nut and gave it the 'ping' test but they sounded exactly the same.
The hub/rotor bolt holes lined up exactly so I left the original hub mounted on the reproduction rotor and assembled the brakes.


Mike

[x66 714]

Thanks for checking that. I left an e-mail for my friend Hal Baer (Baer Brakes) to see if he would make a run of rotors only. I'm waiting for his response. If not I'll order the cheap rotor assm & use my hubs. Thank you, Joe

[bergy]

If one is made out of cast and the other is ductile, those hubs shouldn't sound the same on the "ring" test Mike.  Did the ring like a bell, or just have a dull thud?

[ZLP955]

Good to know they fit! Did you re-use the original SAE, or the new metric bolts to mount the repro rotor on the original hub? Just wondered if the bolts are the same length.

[Mike S]

Hi Tim,

  The bolts are the same length but the threads don't match so I reused the original SAE grade 8 bolts.

Mike

[Mike S]

If one is made out of cast and the other is ductile, those hubs shouldn't sound the same on the "ring" test Mike.  Did the ring like a bell, or just have a dull thud?

  I used a light weight hammer and tried on different parts and they had a dull thud. I could get a slight ring from the rotors though but I figured it was due to the circular shape that would allow some resonance.
  Based on your experience with metals, if you had the rotor in your possession would you be able to tell what type of iron it is made from?

Mike

[bergy]

we had the unmachined hubs traveling down a belt conveyor at the foundry.  Hitting a ductile hub versus a cast iron hub yields a dramatic difference in "ring".  We always cast a gray cast iron "test" hub & painted it fluorescent orange so that it wouldn't get mixed up with the ductile hubs.  The test hub had to fail both the ring test and the ultrasonic test.  it's the wheel hub that you should be ringing, nut the rotor itself. 

[Mike S]

 No 'rings' on the hubs and I've tried holding it by only one stud so as to minimize the possibility of absorbing any sounds.
Hmmmm.....maybe these hubs are not gray iron (aside from having a gray hue to it)?

Mike