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-   -   2.4 crank pictures, opinions. (http://www.mitsustyle.com/forums/showthread.php?t=23760)

Halon 07-13-2009 08:45 PM
2.4 crank pictures, opinions.
 
3 Attachment(s)
So as I said in a different thread, I am considering going with a stroker setup next year. I sourced a crank, but am a bit concerned about it. I haven't boughten it yet. The seller sent me pictures. Here's the pictures, and here is what he said. I was wondering what some of the experts would have to say about this. Also, this is a virgin crank.


Sending pics now. Make sure you look at them pretty close. It appears there is a little scoring on the center (thrust) bearing. I'm not sure if you are planning on cutting this crank or not. Let me know.

Goat Blower 07-13-2009 11:19 PM
Re: 2.4 crank pictures, opinions.
 
It's really hard to tell if it will polish out or not, I sure wouldn't cut it. You really need to see it in person when it's questionable like that.

FattyBoomBatty 07-14-2009 12:23 AM
Re: 2.4 crank pictures, opinions.
 
I don't know about the 4g6x motors, but my crank is .020 under all around and it's been working perfectly for years. Just had it polished and rebalanced last winter, no extra cutting, but it's fine again. So, if all you have to do is cut it, what other problems would there be?

Super Bleeder!! 07-14-2009 12:53 AM
Re: 2.4 crank pictures, opinions.
 
some 4g cranks (usually the turbo ones) are nitrided. cutting a crank removes this nitriding, and its expensive to reapply and straighten the crank.

jhaan_dude 07-14-2009 05:03 AM
Re: 2.4 crank pictures, opinions.
 
of coarse the g54b cranks dont have a problem! they weight like 80lbs! it looks like it had a catch of something on the journal, either bearing or debris, but it would take some "cleaning" to smooth it out. most likely it will NOT polish out.

FattyBoomBatty 07-14-2009 10:13 AM
Re: 2.4 crank pictures, opinions.
 
my crank is forged and nitride hardened stock, so when I had it turned down it had to be renitrided. As I recall, it was less than 100 bucks. Maybe 70 or lower. Crankshaft supply did all the crank work though, so just call them, maybe ask if they can tell from the pictures what needs to happen.

mx3twinturbo 07-14-2009 04:54 PM
Re: 2.4 crank pictures, opinions.
 
Quote:
Originally Posted by FattyBoomBatty (Post 297517)
my crank is forged and nitride hardened stock, so when I had it turned down it had to be renitrided. As I recall, it was less than 100 bucks. Maybe 70 or lower. Crankshaft supply did all the crank work though, so just call them, maybe ask if they can tell from the pictures what needs to happen.
Agreed,

Halon 07-14-2009 05:35 PM
Re: 2.4 crank pictures, opinions.
 
If the crank needs to be ground down, then I'm not interested at all. From the sounds of it, it sounds like there is a pretty general concensus that it more than likely will not polish out, and will have to be ground. So if that is the case, then I'm already not interested.

jhaan_dude 07-14-2009 06:59 PM
Re: 2.4 crank pictures, opinions.
 
ask iceminion he has a few of them laying around. i know he has one thats been micropolished and looks great (sold it to him!)

FattyBoomBatty 07-14-2009 09:02 PM
Re: 2.4 crank pictures, opinions.
 
Just out of curiosity, why don't you want to have a ground crank? Do they become significantly weaker or something?

Halon 07-14-2009 09:26 PM
Re: 2.4 crank pictures, opinions.
 
Because I have a feeling it will slightly affect bearing clearances, which I'd rather try to avoid.

95talonracer 07-14-2009 10:58 PM
Re: 2.4 crank pictures, opinions.
 
I didnt get that crank ready for you to check out today since I worked alot later then expected but am trying to have it ready by Thursday night for ya.

Halon 07-15-2009 08:56 AM
Re: 2.4 crank pictures, opinions.
 
Sounds good. I'm in no hurry dude.

jhaan_dude 07-15-2009 03:06 PM
Re: 2.4 crank pictures, opinions.
 
with a ground crank you get alot more bearing thickness. bearings arent as hard as cranks so they add squish room. in a stroker if you add a thicker bearing it allows the crank to have room to wiggle at high horsepower and rpms!

95talonracer 07-15-2009 05:21 PM
Re: 2.4 crank pictures, opinions.
 
Quote:
Originally Posted by jhaan_dude (Post 297648)
with a ground crank you get alot more bearing thickness. bearings arent as hard as cranks so they add squish room. in a stroker if you add a thicker bearing it allows the crank to have room to wiggle at high horsepower and rpms!
Why take the chance with a turned crank when you can get a perfect stock spec one and know it is good. If the regrind is off just ever so slightly then that was a big waste of money and time. Halon go for a stock spec, NON-ground crank. He has the time to find one since it is not anywhere near winter yet and that is when he wanted to do the 2.3 by what I understood.

jhaan_dude 07-15-2009 05:28 PM
Re: 2.4 crank pictures, opinions.
 
i know, i was trying to steer him AWAY from a ground crank!

bob123131 07-15-2009 07:09 PM
Re: 2.4 crank pictures, opinions.
 
Hard to tell, but i would bet you can get buy with a polish, but if your worried about it just get it ground and use race bearings, most shops wont run them with hardened cranks anywase.

95talonracer 07-15-2009 07:48 PM
Re: 2.4 crank pictures, opinions.
 
Quote:
Originally Posted by bob123131 (Post 297661)
Hard to tell, but i would bet you can get buy with a polish, but if your worried about it just get it ground and use race bearings, most shops wont run them with hardened cranks anywase.
I still wouldnt take a chance when pushing 550-600+ hp like it seems that he will be running.


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