Lunati crank looks blue after cut?
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Lunati crank looks blue after cut?
I just got my parts back and i was lookin at my stuff when i got home and the guy who did the work was gone for the day.The journals are fine but the rest of the crank looks blue like burnt or they heated it up.What is that from is this normal when you cut one of these cranks.It almost looks like they put it in a oven.Any input
Thanks,Mike
Thanks,Mike
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Originally Posted by mr2guru
Nitride treated?
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Unfortunately you are going to ask them what exactly they did and why the crank is blue. I guess you could have a hardness test performed on it to see if the metal was compromised but I doubt they got it THAT hot unless it was actually retreated....
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The process involves heating the entire crank in an oven over a controlled temp for a certain period of time. Its done in a nitrogen atmosphere hence the term nitrided. I suppose after being cut that is a really good thing to do as it adds surface hardness....
Edit: Mr2 beat me to it....
Edit: Mr2 beat me to it....
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Originally Posted by mr2guru
definately nitrided.... did you pay for that service?
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I think the fact that it is not blue all over might mean that it was subjected to an uneven heat, like you would see on a set of headers after some time.
Is it more of a rainbow or more of a blue 'anodized' color?
Is it more of a rainbow or more of a blue 'anodized' color?
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Nitride is done to the whole crank, it is normally grey and cost is 125-160 just for that service. It spends multiple hours (I think 8) in the oven coming up to, then lowering down at a controlled rate.
That looks strange, may be some type of induction hardening.
Kurt
That looks strange, may be some type of induction hardening.
Kurt
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Bluing was always a sign of heat, the bad kind.
The shop I use, uses blue for magnafluxing, clean the crank and see if it comes clean. I doubt it will from the little I can see in the pics.
Can't imagine you got anything fancy for that price.
Can't tell much from Pic, but that looks weird. Heat damage of some kind??
Becareful before u put it back together, be safe & good luck.
.
Bluing was always a sign of heat, the bad kind.
The shop I use, uses blue for magnafluxing, clean the crank and see if it comes clean. I doubt it will from the little I can see in the pics.
Can't imagine you got anything fancy for that price.
Can't tell much from Pic, but that looks weird. Heat damage of some kind??
Becareful before u put it back together, be safe & good luck.
.
Last edited by mrdragster1970; 03-29-2007 at 08:38 PM.
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Now im kinda worryed the shop that did it sends them out.He sayed when i questiond him on this he said the shop who did the crank is a shop that briant reccomends using.And they do alot of big cube race motors.I know just because someone doe's big race motors doe's not make me belive that the crank is right.I will send it out for a second opion before my motor go's together.This just sucks and i don't wanna take any chances.
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blued crank
As Kurt said, it looks like that crank was induction hardened to me as well.
Do yourself a favor, call Dave at Mile High Cranks in Denver. 303-781-6764
Get his e-mail and send him your photos. It could be that he did the work on your crank. I'm sure he can tell you something about it regardless.
Steve
Do yourself a favor, call Dave at Mile High Cranks in Denver. 303-781-6764
Get his e-mail and send him your photos. It could be that he did the work on your crank. I'm sure he can tell you something about it regardless.
Steve
Originally Posted by tuff
Now im kinda worryed the shop that did it sends them out.He sayed when i questiond him on this he said the shop who did the crank is a shop that briant reccomends using.And they do alot of big cube race motors.I know just because someone doe's big race motors doe's not make me belive that the crank is right.I will send it out for a second opion before my motor go's together.This just sucks and i don't wanna take any chances.
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web: www.raceenginedevelopment.com/
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Originally Posted by Steve - Race Eng
As Kurt said, it looks like that crank was induction hardened to me as well.
I am by no means an expert at all, so I don't really know a lot about what processes can be dones to crankshafts, but if that was my crank, I would have it checked over before I spin that sucker to 7500RPM!
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Originally Posted by Old Geezer
Induction hardening is done in a localized area.. In this case, the rod journals, and the mains..Thus the discoloration...