cryogenic treatment of new DBA rotors

[sssgtr]

Will be purchasing some new slotted DBA rotors soonish for my R32 brake conversion, so....anyone, especially dbasteve, could you tell me if cryogenic treatment of brand new rotors will affect the break in of the rotor? Or should i brake the rotor in then have them treated?

[dattoman1000]

Just buy the properly treated ones from DBA.

They have spent plenty on research in this area to get it right rather than just dunking them in liquid nitrogen and hoping they will be stronger.

The extra cost of the 4000 series rotors is probably less than your cryo guy will charge and you know they will be strong and not a risky home made disc.

No offense.

[sssgtr]

None taken :)
The rotors weren't going to be cryo treated as a backyard job; but done by Heat Treatment Australia here in melbourne.
I found the 4000 series rotors last night browsing DBA's site, the slightly extra expense will be worth it.

[Sam_Q]

do you by any chance know how they work out the cost for cryogenic treatment? like how much for the disks you mentioned? any ideas?

[sssgtr]

it's about $5-10 per kg.

[norice]

What's the advantage of having the rotors cyro'ed? So they will last longer or something?

[dbasteve]

Cryogenic treatment of car parts is not something to take lightly. If the material of the component is not suitable it can also be dangerous. When done correctly it may have plenty of benifets.

As Dattoman said we have spent plenty of time researching materials and the correct treatments for the best performance. Thats what the new 4 & 5000 series rotors are about.

In most cases you would be better off Cryo treating your gearbox than discs.

[thehelix112]

Hate to be the cynic, but I've spoken to two qualified metallurgists about cryogenic treatment of metals and they've both said save your money for something useful. That and I tried to find any scientific publication testing the theory that cryogenic treatment actually increases the tensile strength of steel, can you guess how many i found? Zippo.

Do you have any experimental data that proves otherwise Steve? I'd be most keen to see it.
Regards,

Dave

[dbasteve]

I do have quite a bit of information and have done testing.
Most detailed papers are secret womens business and closely gaurded. CSIRO are doing a $10 mil study on the process over the next 5 years.

You won't find any significant change in tensile strength at all. Shock and wear resistance are key features.

[thehelix112]

I hate secret womens business and won't be having anything to do with it until its been proven. And not simply by get-a-successful-team-to-put-a-sticker-on-their-car type proven. Got a link to the CSIRO study? Or even better, a link to your information? :D
Regards,

Dave

[dbasteve]

I think I'm being cornered here!:rolleyes:

CSIRO will publish info to anyone willing to make a large donation to the $10 mil bill.

[dbasteve]

Here is one of my links,

DBA Cryo research centre (http://dba.com.au/forum/cryotank.jpg)

:D

[thehelix112]

Cornered? Nah, I just like to understand a bit about how things work and am less likely than some to take peoples word for it (especially when said people are trying to sell something). No offence.

Regards,

Dave

[Sam_Q]

I was more interested in gettting some con-rods done, but seeing that my engine is quite uncommon and expensive by my standards I wont take the chance

[rodhog]

Well I jsut want to say I had Diff parts treat and they have not broken yet

Ad to that I had it done when Some aircraft parts were being treated. It's one area it's used, so I don't think it's crap, because with an aircraft, when a part on an engine or structure fails

you can't pull over to the nearest cloud and have a look.

I know many who say it's crap, fact is if the part is already weak or too weak, basicly put too much power into a gearbox it's not going to solve everything. I

Cryo is about long term benifits, over metal fatigue not out right stress damage.

Perfect for stopping the whole in the discs opening up too soon.

But best on metal to metal contract parts. It's why even when a 747 -400 hits some birds the engines don't send blades into the cabin killing people. Research and development. CSIRO, $10 M someone's funding that on the side