Lets Talk Rotors: Cryo-treating

clintfocus

im on Centric Cryo blanks now and they're holding up great

Rusty

Interesting reading. People with degrees calling it snake oil. I've had ring and pinions done years ago. Was to help stop breakage of the teeth. Still broke them tho.

__________________

浪人 - 殺し屋
"The Difficult Anytime, The Impossible By Appointment Only"
http://www.the370z.com/members-370z-...o-journal.html

cv129

The one that hit me the most was the first link, where the guy tested it side by side with normal rotors.

I don't have enough knowledge to dispute the science, just wanna shine some light into the bipolar results people are reporting.

For those that run cryo treated rotors, track/abuse them consistently, and yielding noticeably positive results, which vendor did you get them from?

gomer_110

First, saying they "heat treat" is too generic to mean anything. There's so many heat treating processes, without knowing which one specifically is used is worthless.

Secondly, when done right, cryo-treating absolutely can be useful. Cryo-treating is used in more places that brake rotors. Numerous companies that are doing heat-treating (typically carburizing) have deep-freezers for cryo-treating.

Unfortunately, while I might design heat treat furnaces, I'm no metallurgist so I can't tell you what the chemistry behind cryo-treating is.

__________________
'11 370Z Nismo #528 Fast Intentions | Stillen | Motordyne | Uprev | CSF | Zspeed | Z1 Motorsports | AST | Swift | SPC | SPL | Whiteline | Hotchkis | Bride | Schroth | Robispec | Cusco | Nismo | Volk | Forgestar | Hoosier | RJM
'17 Titan Bone Stock

cv129

^ thanks for the input. Below link is what that particular sentence refers to. Don't know if this answers your question at all but here it is.

RX7: RB Rotor Material - RacingBrake Forums

My post here is meant to induce posts/information by showing results contra to the general consensus. Educational purpose, not picking any side.

gomer_110

From reading that link it sounds like the "heat treating" that's being done is simply a process called normalizing. Only real purpose of the normalizing is to relieve stesses in the metal (helps with distortion).

Now that I'm curious about this, I'll have to talk to some of the process/metallurgist guys at work on Monday.

__________________
'11 370Z Nismo #528 Fast Intentions | Stillen | Motordyne | Uprev | CSF | Zspeed | Z1 Motorsports | AST | Swift | SPC | SPL | Whiteline | Hotchkis | Bride | Schroth | Robispec | Cusco | Nismo | Volk | Forgestar | Hoosier | RJM
'17 Titan Bone Stock

cossie1600

Rotor is a hunk of metal, just get a reputable brand and you will be fine. My old Corvette came with cross-drilled rotor. When I used to track them, little cracks would develop after EACH event. With a set of cheap NAPA rotors cryo treated, cracking didn't occur until a few events later. The NAPA rotors were standard off the shelf ones. When I replace the rotors on my Z, I am just going to go to Advanced Autoparts for some $75 rotors.

cv129

^thanks. Where did you get yours cryo treated (300below, frozenrotors, etc)?

I am aware of the cheap yet solid alternative of treating some parts more like disposable items: get decent ones at pedestrian price, use them but switch them out more frequently. This will surely be in my repertoire when I start to track it.

However, I just wanna learn more about the topic. Seems like cryo treatment must be done right (duh..) to achieve the right results, so one thing I wanted to establish is vendors that had provided cryo treated rotors with the expected positive results.

cossie1600

This was done when cryo treating became really popular. I remember it was a place that was 50 miles from my house. They did engine parts and medical items. They ordered the rotor from NAPA for me, got it done and had it shipped to the house. Honestly, they could have lied to me and I wouldn't be able to tell the difference when I first saw the rotors. Yet when I put it through the first track day, I was immediately sold as I did not see a single crack after my first track event

MightyBobo

Nice to finally hear from someone who's done it personally...

__________________
I don't own a car anymore.

gomer_110

Had a chance to talk to one of the metallurgist guys at work today. Apparently even in the metallurgist community is split over cryo treating. In practice it will reduce the internal stresses and therefore reduce/eliminate the formation of microcracks under heat cycling. However according to the guy I work with there is no scientific proof of the effects of cryo treating to the microstructure of the metal.

In other words, it works but no one can prove 100% why.

__________________
'11 370Z Nismo #528 Fast Intentions | Stillen | Motordyne | Uprev | CSF | Zspeed | Z1 Motorsports | AST | Swift | SPC | SPL | Whiteline | Hotchkis | Bride | Schroth | Robispec | Cusco | Nismo | Volk | Forgestar | Hoosier | RJM
'17 Titan Bone Stock

Super Werty

reviving this thread. When I was racing the 1/4 mile in my Truck....4400 lbs with me in it, I kept warping the stock rotors and thus ruining the pads as well. hitting the brakes at 110 mph was scary lol

I upgraded to powerslot cryo slotted rotors on the front...rear was drum. Never warped them again and made probably 35 1/4 mile stops on them. Braking definitely improved.

Looking to get them on the Z when that time comes

cv129

Since this was revived....a thread that i came across, don't mind the title, click link and skip to post #20, post by DBA Steve

DBA 4000 Rotor cracks/gerissen - Corvette Forum

Not cryo treating but good read for a beginner like myself. Shine some light into how to abuse the rotors correctly.

cossie1600

The Corvette has 10 to 20mph more than our car on the straights, make sense htey use the brake more....