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Old 03-19-2017, 03:40 AM   #1
voidteam
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Default Is this a nitrated crank?

Hi just wondering if anyone can help me work out of this is a normal or nitrated crank?


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Old 03-19-2017, 08:17 AM   #2
motorbykemike
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yeppers
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Old 03-19-2017, 08:30 AM   #3
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Now quick, toss it and get a og forged, or newer forged/heat treated crank...

The nitrated crank is known to be the weakest of all Subaru cranks. A few have documented them breaking in half.

If your building for higher hp/trq. I would source a different crank. If its a basic build that wont be spun high rpm or beat on then run it I guess.

This is just IMO.
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Old 03-19-2017, 09:57 PM   #4
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Default Is this a nitrated crank?

Quote:
Originally Posted by rexworx View Post
Now quick, toss it and get a og forged, or newer forged/heat treated crank...



The nitrated crank is known to be the weakest of all Subaru cranks. A few have documented them breaking in half.



If your building for higher hp/trq. I would source a different crank. If its a basic build that wont be spun high rpm or beat on then run it I guess.



This is just IMO.


this is completly false.

the 2011+ STI nitride crank is double cross drilled and heat-treated; it is plenty strong. they are used in most of IAG's blocks.

Last edited by Titter; 03-19-2017 at 10:06 PM.
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Old 03-20-2017, 04:49 AM   #5
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Well im rebuilding for a max of 500hp and was hoping to get my existing crank balanced and reuse it...

Will pros only ever run 400hp as a high boost tune however.
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Old 03-20-2017, 10:51 AM   #6
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Quote:
Originally Posted by Titter View Post
this is completly false.

the 2011+ STI nitride crank is double cross drilled and heat-treated; it is plenty strong. they are used in most of IAG's blocks.
Well your right about one thing. Yes in 11+ it is different. We aren't talking about a crank from a 11+ though my friend.... The 08-10 crank is what we are talking about. In fact I said the newest cranks are good....

How many cranks are sitting on your work order shelf as you type?
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Old 03-20-2017, 04:18 PM   #7
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^+2
I've heard of people breaking the nitrated crank also and broken cranks is pretty rare otherwise
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Old 03-20-2017, 04:27 PM   #8
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Quote:
Originally Posted by rexworx View Post
Well your right about one thing. Yes in 11+ it is different. We aren't talking about a crank from a 11+ though my friend.... The 08-10 crank is what we are talking about. In fact I said the newest cranks are good....

How many cranks are sitting on your work order shelf as you type?
It came out of MY11 WRX
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Old 03-20-2017, 04:43 PM   #9
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It's a possibility that SOA only sells one replacement 2.5 crank at this point, but a new 2011 wrx crank is cross listed to the STi. Not to say yours is the same...

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Old 03-20-2017, 05:42 PM   #10
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Exactlly... All 79mm stroke cranks have been superseded with the new heat treated crank.

If you search youll find pics of the broken 08-10 cranks. Clint or Tony at TiC deff posted one they have broken. Should be easy to find that thread...
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Old 03-20-2017, 06:49 PM   #11
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What's the general consensus on the limits of the nitrated crank?
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Old 03-20-2017, 07:24 PM   #12
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It really seems to be hit or miss. No clear "keep it under 500whp/8krpm etc. I personally ran one in a built block for a few years starting back in 2009ish. Car made 410whp/480wtrq. I never had a issue. Im not much of a gambling man... IMO the 300ish bucks for another crank is well worth the cost of the carnage a broken crank would cost. So when I decided to do a teardown to inspect the internals I swapped it out. I ended up building a 2.12 stroker with it. I figured the lighter weight of ej205 pistons would be less load on it...
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Old 03-20-2017, 07:31 PM   #13
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Default Is this a nitrated crank?

my bad i had my cranks mixed up. thought you were talking about the new ones.
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Old 03-20-2017, 07:53 PM   #14
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Quote:
Originally Posted by rexworx View Post
It really seems to be hit or miss. No clear "keep it under 500whp/8krpm etc. I personally ran one in a built block for a few years starting back in 2009ish. Car made 410whp/480wtrq. I never had a issue. Im not much of a gambling man... IMO the 300ish bucks for another crank is well worth the cost of the carnage a broken crank would cost. So when I decided to do a teardown to inspect the internals I swapped it out. I ended up building a 2.12 stroker with it. I figured the lighter weight of ej205 pistons would be less load on it...
Maybe Ill try to sell my 09 crank and buy a new one. I'm going to be putting a hybrid together this summer. Looking to push my gt3076 on e85.
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Old 03-20-2017, 08:11 PM   #15
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I cannot help myself.............it's nitrided not nitrated.
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Old 03-21-2017, 11:20 AM   #16
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Quote:
Originally Posted by rexworx View Post
Exactlly... All 79mm stroke cranks have been superseded with the new heat treated crank.

If you search youll find pics of the broken 08-10 cranks. Clint or Tony at TiC deff posted one they have broken. Should be easy to find that thread...
indeed we have. snapped in half. we've seen it a few other times locally as well, and I know of other cases.

We're only using the newer induction hardened crank because of this.
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Old 03-21-2017, 12:11 PM   #17
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Quote:
Originally Posted by Turn in Concepts View Post
indeed we have. snapped in half. we've seen it a few other times locally as well, and I know of other cases.



We're only using the newer induction hardened crank because of this.


How much power snapped your crank?
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Old 03-21-2017, 04:37 PM   #18
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Quote:
Originally Posted by isurfnj1 View Post
How much power snapped your crank?
Honestly we don't know. We didn't have the dyno set up at the time so we never got a chance to measure it, and given the race schedule we never made it to one to try out.

I can say it was a large amount though given the lap times we were turning with the car at that time.
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Old 03-22-2017, 04:29 AM   #19
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Quote:
Originally Posted by tramp View Post
I cannot help myself.............it's nitrided not nitrated.
Thanks.


So should I use my existing crank or buy a new one? They are much more expensive down here (Australia). For a new one it will cost about $800-$900. I wont be going past 400hp.

Ill also be getting the crank crack tested, grind and balance (if needed).
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Old 03-22-2017, 05:50 AM   #20
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Quote:
Originally Posted by tramp View Post
I cannot help myself.............it's nitrided not nitrated.
Yeah that was driving me nuts too. Nitrated is something they do to hot dogs
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Old 03-22-2017, 07:35 AM   #21
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Quote:
Originally Posted by voidteam View Post
Thanks.


So should I use my existing crank or buy a new one? They are much more expensive down here (Australia). For a new one it will cost about $800-$900. I wont be going past 400hp.

Ill also be getting the crank crack tested, grind and balance (if needed).
Were it mine I'd have it magnafluxed (crack detection) and inspected by the best crank guy I could find and go on his assessment.
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Old 03-22-2017, 07:45 AM   #22
voidteam
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Quote:
Originally Posted by tramp View Post
Were it mine I'd have it magnafluxed (crack detection) and inspected by the best crank guy I could find and go on his assessment.
The machine shop I am using are going to crack test it but I don't really know what method they use.
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Old 03-22-2017, 09:05 AM   #23
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This will be my build thread and has more info on the car.
https://forums.nasioc.com/forums/sho....php?t=2832372
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Old 03-22-2017, 10:21 AM   #24
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Quote:
Originally Posted by voidteam View Post
Thanks.


So should I use my existing crank or buy a new one? They are much more expensive down here (Australia). For a new one it will cost about $800-$900. I wont be going past 400hp.

Ill also be getting the crank crack tested, grind and balance (if needed).
Wow! Would shipping one in from the states be cost prohibitive? Brand new they go for about $380 around here IIRC.
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Old 03-22-2017, 10:23 AM   #25
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Also is this a 2.5l or 2.0l? I know some of the AUS sti's run the 2.0...
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