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Rock pistons and cyl wall question


thedsmguy
Senior Member


Galant VR-4 org Post #: 967480 posted 02/03/11 11:47 PM     Remind Me!  Send Private Message   Edit Post      
I have a chance to buy a "shop" rebuilt factory spec bottom end for a pretty cheap price. Question is, are "rock" pistons worth a crap and one of the cyl walls has a up/down "scratch" in the cyl wall, if you run your fingernail over it it will catch lightly. I would think that this would still run fine the motor spins freely etc. Any input would be awesome.

Thanks.

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The_Big_Weave
Member +


Galant VR-4 org Post #: 967501 posted 02/04/11 01:16 AM     Remind Me!  Send Private Message   Edit Post      
If it was rebuilt they should have bored and honed the cyl and you should not feel anything it should be smooth.



554/1k SOLD
Non-galant owner.
01 S2K

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TylerAdamson
circles method
934/1000


Galant VR-4 org Post #: 967503 posted 02/04/11 01:30 AM     Remind Me!  Send Private Message   Edit Post      
If you're fingernail is catching it then it wasn't machined properly. I would not run the motor



1992 Eagle Talon TSi AWD FP3565 Powered
1992 Mitsubishi Galant VR4 934/1000

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TrendSetter
Unregistered


Galant VR-4 org Post #: 967530 posted 02/04/11 06:25 AM     Remind Me!  Send Private Message   Edit Post      
usually when boring a block the boring bar leaves a vertical line in the cylinder. it should go away when the cylinders are honed. if its still visible, and worse, you can feel it, then the machine shop messed up.

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alansupra94
Excuse the retarded question.
4/1000


Galant VR-4 org Post #: 967556 posted 02/04/11 09:48 AM     Remind Me!  Send Private Message   Edit Post      
You should definitely not be feeling anything on those walls. Seeing the crosshatching is a different story.



1992 Galant VR4
1996 Toyota Supra TT

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Muskrat
Senior Member
665/2000


Galant VR-4 org Post #: 967575 posted 02/04/11 11:34 AM     Remind Me!  Send Private Message   Edit Post      
^1 on what's been said.

1) It's a stress riser.

2) It's a heat riser.

When/if that block fails, I bet it cracks in that groove. I'd stay away from it. No reason to buy a questionable block, unless you plan to bore it out anyway.



Brian L.
91 Galant VR-4 #665/2000

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thedsmguy
Senior Member


Galant VR-4 org Post #: 967586 posted 02/04/11 12:28 PM     Remind Me!  Send Private Message   Edit Post      
Ok.. The weird thing is that its not a true strait up and down line. Sorta goes sideways a little almost like it was put(or happened) after it was honed etc. I'll just pass on it I guess.

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thedsmguy
Senior Member


Galant VR-4 org Post #: 967767 posted 02/05/11 02:22 AM     Remind Me!  Send Private Message   Edit Post   
I pulled the piston out of that block today. The bottom (oil scraper) ring had its "middle" part basically overlapping itself. I went to a machine shop and they suggested emmory cloth and a ball hone and let it rip.

Anyone see any problems? The scratching really wasn't super deep.

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