We have started doing cryo treating to the internals of the engines we rebuild if the customer so requests it. It doesn't really cost that much for the added strength and longevity of the parts treated. We can do the Apex seals, springs, side seals, springs, corner seals, springs, and oil control rings for $150 and the rotor housings for $100 each. That is what we are charged, and therefore that is what the customer pays for the treatment. We don't make anything on it, but I think it is a really good thing to have done. We are doing it tot he 13B-REW engine that we are doing for Loi, who is the owner of SportCarMotion.com On other rotary engines that have had this treatment locally that were used in sand rails, there was approx a 30-50% increase in longevity on their parts. The housings still looked near new when the engines were gone through (they were rebuilt just to see wear) I looked at his data that he has aquired over the years, and we were sold. I know that alot of people use that treatment for brake rotors and so forth, so it seemed like a good idea for engine parts as well. We shall see :bigok:

sounds good !! maybe i'll do that if i get a spare engine https://www.nopistons.com/forums/pub...DIR#>/wink.png

Sweet! I'll keep that in mind for when I rebuilt one. https://www.nopistons.com/forums/pub...#>/BURNOUT.gif

I noticed that you don't mention doing the rotors. Why is that?

very cool

We could, but the rotors don't touch the surface of the engine housings so there really isn't a reason. We could do them I am sure. I guess it could help with seal wear in the rotor grooves. Probably would cost around what it does to do the housings.

I have been hearing a ton about the cryo treating, I should do it on one of my tranny's when I finally get them in. Just take out all the parts and send them to you or something.

Wonder if it would help the rotors and housings withstand the apex seals gouging them when they break. For that to work the seals probably shouldn't be treated though cause that would just harden them?

that's about the only thing my engine didn't have done to it.

I wondered the same thing myself a while back, check it out.



http://www.rx7club.com/forum/showthread.ph...t=cryo+and+apex



Kyle

OK now I have a question. When it said in the other thread you can cryo treat any kind of metal does that include brass? Specifically what I'm wondering is if I had my tranny and rearend cryo treated would they cryo treat my syncros? If they did this to my syncros how would it affect them? If I understand the workings of a tranny correctly the syncros are supposed to cussion the gears and make them mesh correctly by matching the rpms. I believe this is why they are made of brass(soft medal = cussion). Correct? Please let me know if I'm wrong. I would like to learn as much as I can about cryo treating most of my driveline. Thanks.

HHmmmm...now i have to save up a lil more. Never heard of Cryo treating before, what exactly does it do what's done to the parts? thanks

Cryo treatment is not really "new" technology, but it has been taken several steps farther then it was 50 years ago. People used to let axles rest in dry ice for a period of time to strengthen them to a certain extent. There wasn't an abundance of aftermarket support so people used this instead.



Deep cryo is usually what you see now and is probably a lot more effective, as the temperatures are far more extreme, resulting in a better bond of the molecules. I believe parts are taken to 250-300 degrees below 0 and then slowly brought back up to normal temperature. This, in turn, literally tightens and strengthens the bonds of the molecules of the material.



Check out One Cryo for some more information.



As for the brass synchros I couldn't say for sure. The process, from what I understand of it, doesn't necessarily make parts "harder" per say, but makes them stronger.



When my time comes, whether it be rotor, piston or any other item, I'll definately be giving this stuff a try.



Good luck.



Kyle