Cryo treatment on rotating assembly

[DaviesDJ]

Dear all,

I know some of you (esp the "perry" cheap Pel;-)) have had some positive experience with cryo treatment:-

Now received my new rotating assembly for my SBC - cast steel crank - forged h beam rods and forged pistons. Was thinking that as I am in no rush as this engine will go in later in the year ( once it is in then the rover rebuild will start) I should get the whole lot Cryo treated??? Do you think this is worth it??? Do the crank journals need re-polishing after the treatment??


Have read about the ferrous chemistry related to this and understand the benefit, but in a rotating assembly where a mixture of properties including dampening characteristics are needed would it be useful??

Also how would it benefit aluminium?? I assume it would stabilise the silicone/alloy matrix but if these are forged should they not already have a natural grain???

And last of all - bearings??? Would Cryolife treatment improve bearing life?? Would it improve the ability of the bearing material to resist scuff???

Many thanks all

Dave

[cammmy]

I can't advise on the cryo-treatment (although I've heard good things) but in terms of bearing/crank journals; check out the TLML coatings on this website:

http://www.techlinecoatings.com/hi-perf ... tings.html

[mgbv8]

Dear all,

I know some of you (esp the "perry" cheap Pel;-)) have had some positive experience with cryo treatment:-

Now received my new rotating assembly for my SBC - cast steel crank - forged h beam rods and forged pistons. Was thinking that as I am in no rush as this engine will go in later in the year ( once it is in then the rover rebuild will start) I should get the whole lot Cryo treated??? Do you think this is worth it??? Do the crank journals need re-polishing after the treatment??


Have read about the ferrous chemistry related to this and understand the benefit, but in a rotating assembly where a mixture of properties including dampening characteristics are needed would it be useful??

Also how would it benefit aluminium?? I assume it would stabilise the silicone/alloy matrix but if these are forged should they not already have a natural grain???

And last of all - bearings??? Would Cryolife treatment improve bearing life?? Would it improve the ability of the bearing material to resist scuff???

Many thanks all

Dave

I'm sure all the answers to your questions can be obtained during a chat with Andy at 195 Below Dave??

Give him a call or send an email to start a dialogue mate. He is a very knowledgeable chap

[stevieturbo]

Going to the lengths of getting parts treated sort of implies there is an inherent weakness in these parts already and that you fear they may fail.

If that isnt the case...kind of hard to justify spending on any treatment, as you wont see any gain ?


It's fairly common with gears and similar parts. Obviously these are under stress and have limited options to increase durability when pushed hard.

But crank and rods etc ? I just dont see it. Do these items fail regularly in your intended application ?

[mgbv8]

Dave is a belt and braces guy Stevie

[stevieturbo]

From an engine point of view...I just cant see any value for money in it, because it isnt actually resolving any problems, or strengthening any weaknesses.

[DaviesDJ]

Hi guys - I have not purchased the greatest of rotating assemblies - but it is definitely up to the job:-) basically I just want to put in the rotating assembly I have as best I can - the rods are h-beam etc - but they are third party - the crank is steel (scat 9000) but cast - the pistons are forged and are probably as good as I can get. But want to minimise wear - and minimise the need for me to change anything in the future. Let's say I want to progress to more and more NOS - or add forced induction etc in the future - I would like to just maximise my options. Transmission is my weakness!! No doubt - even now with my trusty rover! Just as I go along want to do it as best I can. True perhaps I should have forked out for an entry level forged crank and slightly better rods (although they are 40 whatever grade etc) - but I was not all that familiar with chevy parts at that time and since the landy has taken up (and become addicted to) drag racing - just don't want to ever have to replace my block after a rod going through it;-)

Total rotating assembly - probably what 30kg ish (no flywheel???) total price about 2-300 quid about.... Actually it sounds a lot;-)

Perhaps I won't bother??? I really am unsure. Actually perhaps it may be a better idea to spend that on other things.

[DaviesDJ]

Guys - have chatted with my vendor, they have offered to exchange my crank for a forged 4340 item for an extra 270 pounds, think I will go for this, ans the cost of cryo and internal balance etc will be saved - and then I would still have a cast crank. Basically I then have a future proof bottom end!

Think I should go for it?