cracking rotors
 

Using sports rotors at the rear. My centric rotors lasted for 8 trackdays and worn down.

These are Rotora rotors, 2 trackdays old. Wonder if it is me or the rotors.

https://www.miataturbo.net/attachmen...ine=1399013032

https://www.miataturbo.net/attachmen...ine=1399013032

My rear non-sport rotors cracked in the same way at the track once. I don't know their original source. I don't use the emergency brake in the paddock but the hot pads could cause dissimilar cooling just being in proximity when really hot. I'm guessing that is what happened.

I don't use handbrake in the padlocks either. These cracked on the track. I m guessing is issues woth cross drill rotors.

crack goes straight through the drill holes. This is not uncommon for drilled rotors.

use solid rotors.

+1

Too many speed holes

But unsprung weight is the devil and the rear brakes don't do anything!!!

people really do say the dumbest things sometimes, dont they?

Lol fail, not a coincidence that the crack goes right through 2 of the drilled holes.

Rotora = no thanks. I'll stick with NAPA blanks.

Drilled rotors suck [/thread]

Came to say drilled rotors bad, but I'll see myself out now.

I have seen dozens of drilled rotors crack and never saw one that was not drilled crack. Seems to be a pattern here:2cents:

+1. For well used / abused solid rotors, micro cracking is not fatal - but when that occurs in shitty drilled rotors, you are speeding for a bleeding.

I've seen non-drilled rotors cracked -- in fact, I cracked one myself. (11" Wilwood rotors on Goodwin hats). Mine cracked after I grenaded the tranny at Laguna and had to sit in the dirt with the brakes on (to prevent rolling backwards) for about 5 minutes while waiting for a tow. So it seems there really is something to those cooldown laps and parking it in the paddock with the parking brake off. :)

--Ian

I cracked a non-drilled/slotted rotor once, but I was being a bonehead and running the rotors with substantial micro-cracking all the way around. Had I followed my own advice and pulled them when the cracks were 1/3 of the way across the rotor, it never would have happened.

same, I also cracked some rotors pretty badly when the piston was seizing on one side and overheating the rotor

At Road Atlanta:

https://www.miataturbo.net/attachmen...921_172712-png

https://www.miataturbo.net/attachmen...921_172744-png

https://www.miataturbo.net/attachmen...926_201545-png

This rotors look like they needed replaced far before a track day at RA. ^^

These are your rotors on crack

Crack.

Not even once.

Interesting that all the pictures here are rear rotors. Are they more prone?