Crank regrind
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Crank regrind
Bought an sti3 recently with a shafted engine (big ends).
Having it rebuilt at the moment, just to standard spec.
Every engine I have ever had rebuilt, has had the a crank regrind, not a new one.
Never had a problem.
My question is, what is so different about the impreza crank?
How people on here have had their crank re-ground and still have a healthy engine?
Thanks in advance.
Chris
Having it rebuilt at the moment, just to standard spec.
Every engine I have ever had rebuilt, has had the a crank regrind, not a new one.
Never had a problem.
My question is, what is so different about the impreza crank?
How people on here have had their crank re-ground and still have a healthy engine?
Thanks in advance.
Chris
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Have to admit I don't know the exact nature of the hardening process on Subaru cranks but if it is one of the low temperature treatments such as Nitriding or Tuftriding, the crank is ground to size then heat treated. As it's a low temp treatment there is no distortion and the journals are just polished to finish. The surface is very hard but also very shallow, hence furter grinding may well remove the hard skin.
JohnD
JohnD
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John D is pretty much spot on.
see also my posts on the end of this thread, and Zen performance / APIdavid posts as well.
Don't regrind your crank.
https://www.scoobynet.com/general-te...hlight=nitride
see also my posts on the end of this thread, and Zen performance / APIdavid posts as well.
Don't regrind your crank.
https://www.scoobynet.com/general-te...hlight=nitride
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Bought an sti3 recently with a shafted engine (big ends).
Having it rebuilt at the moment, just to standard spec.
Every engine I have ever had rebuilt, has had the a crank regrind, not a new one.
Never had a problem.
My question is, what is so different about the impreza crank?
How people on here have had their crank re-ground and still have a healthy engine?
Thanks in advance.
Chris
Having it rebuilt at the moment, just to standard spec.
Every engine I have ever had rebuilt, has had the a crank regrind, not a new one.
Never had a problem.
My question is, what is so different about the impreza crank?
How people on here have had their crank re-ground and still have a healthy engine?
Thanks in advance.
Chris
Ns04
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There are a number of reasons not to regrind, besides the surface hardness, which is less of an issue with good forged cranks than people think. Getting the abrasive dust out of the oil ways isn't always guaranteed, nor is the resulting straightness of the crank. The biggest issue is that I've only come accross one or two machine shops that will grind the subaru crank properly. The narrow journals make it difficult to get in with some grinding machines, and i've seen a few botched jobs.
Just buy a new one.
Paul
Just buy a new one.
Paul
#10
Bought an sti3 recently with a shafted engine (big ends).
Having it rebuilt at the moment, just to standard spec.
Every engine I have ever had rebuilt, has had the a crank regrind, not a new one.
Never had a problem.
My question is, what is so different about the impreza crank?
How people on here have had their crank re-ground and still have a healthy engine?
Thanks in advance.
Chris
Having it rebuilt at the moment, just to standard spec.
Every engine I have ever had rebuilt, has had the a crank regrind, not a new one.
Never had a problem.
My question is, what is so different about the impreza crank?
How people on here have had their crank re-ground and still have a healthy engine?
Thanks in advance.
Chris
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