Outer Limits 4x4 Board

howya goin,

been doing some research in heat treating cv's and axles but it is a bit of a grey area.

i want to run 35's on my hilux but dont want to break cv's every trip out the bush.i have seen 35's on hiluxs so they must be able to stand up to the task as long as your not pushing them to hard im guessing.

anyway more to the point i can get a set of cv's nitrided fairly cheap but i dont want to be wasting money so im hoping some of you guys can help me out.at my work we nitride all turbo engine cranks to stop them wearing and as far as i can understand is it stops them wearing not necessarily make them stronger

have any of you tried this idea and does it work?
is there any other heat treating that will help other than nitriding?

thanks..smiley..

83-mud-lux wrote:howya goin,

been doing some research in heat treating cv's and axles but it is a bit of a grey area.

i want to run 35's on my hilux but dont want to break cv's every trip out the bush.i have seen 35's on hiluxs so they must be able to stand up to the task as long as your not pushing them to hard im guessing.

anyway more to the point i can get a set of cv's nitrided fairly cheap but i dont want to be wasting money so im hoping some of you guys can help me out.at my work we nitride all turbo engine cranks to stop them wearing and as far as i can understand is it stops them wearing not necessarily make them stronger

have any of you tried this idea and does it work?
is there any other heat treating that will help other than nitriding?

thanks..smiley..

would nitriding have a negative affect due to it adding material?

I know people in other motorsports have good success with cryo treatment.

Doesnt nitriding increase hardness? heat treated CV's are basically "softer" and "tougher" than stock, not harder and more brittle.

Just buy a set of the many commercially available upgraded CV's

http://www.Locktup4x4.com.au" onclick="window.open(this.href);return false;

hulsty wrote:Doesnt nitriding increase hardness?

Yes, but I'm pretty sure it also increases the size of the original part.

no teheko no, same size, just the grain structure changes in the steel..
wheres bazzle?

Fart arseing around heat treating CVs these days when you can get a set of cromo CVs and axles seems like a complete waste of time IMO. Before cromo CVs were around people had reasonable success with heat treating, birfield rings etc but really for $1k at your door why would you bother?

Nitriding is a case hardening treatment and very effective at raising surface hardness. Standard CVs are already case hardened though. The stronger ones are full quench & temper and presumably case hardened as well. However, you can't fully quench and temper the standard CVs as they are not hardenable enough and you'd ruin them anyway. "Cryo" treating is also not applicable - and not necessarily better anyway as whilst it increases strength it reduces toughness. The Longfield CVs claim to be made from heat treated SAE4340 type steel - sounds to me that's a good way to go. 4340 is very strong when hardened, has good toughness due to the nickel content and is good for case hardening. Mind you, your axles or diff might blow up instead.

Reagrds,
The boring metallurgist