Cryo + Magnaflux

[Tbone07]

When my motor gets here I plan on having the tranny cryo'd and/or magnafluxed. Where's a good place to get this done? Estimated cost?

Also, what about back cutting?

[Jerry Hall]

When my motor gets here I plan on having the tranny cryo'd and/or magnafluxed. Where's a good place to get this done? Estimated cost?

Also, what about back cutting?

We also back gears but I do not recommend doing it to new gears unless you are making an over-ride transmission or trying to avoid replacing gears that have the engagement dogs rounded off.  Back-cutting makes sense to our intuition on making the gears latch together more positively when under power but many times makes the gear disengagement more difficult when shifting to the next gear.  

The case hardening on the gears is about .025" to .030" thick.  Back-cutting usually requires more than .030" to be removed.  Once the case hardening is removed the softer material has to carry the load.  The soft surface (corners of the engagement dogs) will ware more rapidly on a back cut gear than a new gear that has not been back-cut.  

Cryo treating the gears will not hurt anything but is a unnecessary expense unless you are trying to run 3 times the power through the gears box that it was designed for.

[Tbone07]

This will be a 350cc Sphynx making around 60-65HP

So a no-go on the backcut. I'll get the gears cryoed if i've got some spare change.

Thanks for your advice Jerry

[Burns363R]

Cyro'ing gears wont hurt anything like Jerry said.  That being said im still running a stock 86 trans in my 363cc engine.  Its the same trans i have been racing on for years with multiple BB engines on.  Obviously some people have blown transmissions with less and more power, but i guess im not sure where the limit is.  I had figured id need something for mine.  But its still going strong for a 28 year old transmission.

[Tbone07]

That's what I was thinking too Burns. I'm not hard on transmissions either.

[Burns363R]

Ya Im not even sure why Cryo costs.  I would probably do it to mine if it was affordable.  But i havent had any issues with my 363r sphynx.  And i know im putting more stress than typical due to my high final drive gearing.