Posted By: volumex
crank - 20/06/2008 09:28
anybody know were i can get a crank re-ground and balanced for a 20vt properly
Posted By: Anonymous
Re: crank - 20/06/2008 13:26
any F.E.R registered engine remanufacturer would be able to do this
Posted By: Anonymous
Re: crank - 20/06/2008 13:31
some of them get a bit confused when ballancing them though, just make sure they know its not a v5
Posted By: redinstead
Re: crank - 21/06/2008 21:14
the coupe cranks dont like a regrind due to the nitriding which gets removed when ground causing premature wear there a f.aq on here i think
Posted By: Anonymous
Re: crank - 21/06/2008 21:25
the coupe cranks dont like a regrind due to the nitriding which gets removed when ground causing premature wear there a f.aq on here i think
I am pretty sure that is only the 16 valve cranks. Although I may be wrong.
Posted By: Anonymous
Re: crank - 22/06/2008 10:56
No, its also the 20v.
But you can get it nitridid again - i did, and it works like a charm!
Posted By: Anonymous
Re: crank - 22/06/2008 11:44
the nitriding would done to a thickness, e.g. 0.6mm, as long as you do not remove to much of the nitriding then you will be fine
You need to find out how thick the nitriding is before you do anything
I personally would just get a good second hand crank, the cost of nirtriding and grinding a crank would probably be more expensive than replacing the crank
Posted By: Scuderia
Re: crank - 22/06/2008 12:05
Any grinding will remove all the nitriding. Keep in mind most cranks are not nitrided in the first place and they get along fine. If you are building a race engine or something highly stressed its not a good idea but for any average engine it will be fine.
Posted By: Anonymous
Re: crank - 22/06/2008 18:06
But you can get it nitridid again - i did, and it works like a charm!
Really??!!??
Posted By: Anonymous
Re: crank - 22/06/2008 19:09
Yeah - although they called it something else (danish word, and i dont know what it translates to), but its the same treatment that the Le Mans Audi R8 TDi engine gets done. Actually the same guy that does Audi's did mine
BMW also needs a re-nitride treatment when regrinded. Oh and the 20v workshop manual also describes that a re-nitride treatment is required after a regrind.
Posted By: Anonymous
Re: crank - 22/06/2008 21:28
I was under the impression that you could only plasma nitrite when the crank is actually made as a heat treatment. It can be re-applied afterwards but doesn’t actually do anything as it is not gone deep into the material. Can anyone confirm this?
Posted By: Danhgt
Re: crank - 23/06/2008 01:24
I was under the impression that you could only plasma nitrite when the crank is actually made as a heat treatment. It can be re-applied afterwards but doesn’t actually do anything as it is not gone deep into the material. Can anyone confirm this?
Thats the way I understand it, surely a new or good crank is a better option.
Posted By: Scuderia
Re: crank - 23/06/2008 07:54
AFAIK re-nitriding a crank is very difficult and expensive.
Posted By: Anonymous
Re: crank - 23/06/2008 09:17
im not convinced they are nitrided in the first place
Posted By: JohnS
Re: crank - 07/07/2008 14:14
They ARE nitride hardened - it says so in the workshop manual.