Weird cylinder scoring?!

if your afr's were rich enough, the extra fuel will wash the bores down of oil and cause wear like that....

 
like i told Lobstah, I'm pretty positive it was from bad oil pressure. when i was in CA the oil feed line that runs across the top of the block and goes to the turbo broke in half, and it was a while before i even noticed... therefore the piston rings were starved of oil and they caused the scoring. Guess we'll find out when the pistons come out if my theory is right...

 
looks like a broken ringland to me. 100mm pistons and a rebore should fix it. i wouldnt bother with sleeves. i dont know why anyone does to be honest.

 
Well I was over at Lobstahs house yesterday and looked at the block in person. I must say that the pictures are making the damage look worse than it really is. The damage is not good by any means but in person it is not as bad as I thought it was. A .5 mm over bore with new pistons and rings should fit the bill well. Also, there is piston slap on the the engine. So I assume that either the rings are shot or that they pistons/rings were not sized right in the first place.

 
if they're factory they were most likely sized right, if it was rebuilt or aftermarket its a crap shoot.

 
Evan they are wisco aftermarket pistons that did this damage. I am pretty sure they were not sized right. That or the rings are worn from the scrapping.

 
Pretty sure the sizing is not the case. Everything checked out with the receipts from ECS. They are stock size and only a cylinder hone was done. if there is no damage on the pistons skirts and the rings are fried, then we know what happened...

 
Do yourself a favor and leave Nasioc alone. If you want good expert advice from tuner shops and people in the biz in general go over to iwsti.com you will get better input and and be flamed for asking a possible dumb question like on nascrap. You shouldnt be able to feel much less see cylinder wall scoring like that. Plus, from just looking at your pics and talking to Sergei you can tell oil was cokeing ontop of your cylinder. Looks like someone dumped oil down your cylinder on top of the pistons and then took a blow torch to it and baked it on. I was telling sergei you could try to clean those pistons up just as long as the scoring did "josh" up the piston itself. Hopefully you just need new rings. Problem is you are going to almost 100% need a bore on the cylinder wall to fix that. No piston slap is not normal. If you have piston slap means you had someone build your motor that doesn't know what the hell they are doing. Or they didnt bore or hone the cylinder properly.

Just head on over to iwsti.com start reading up on things you will learn a lot.
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I agree with dibloadsit.

nobody mentioned the ribbing of wall on the deck, coinciding with the marks. the forged pistons are too hard for the sleeve encapsulation...

and being the bubble burster, The lack of closed decks has kept me from the EJ engine. If a pro could sleeve it stronger, and *really* keep it planted respecting its material exapnsion.. that would be a winner...but who has done it?
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I have found the aftermarket sleeves.. they all same material..like nobody cares where it is going completely....
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I never really wanted to go sleaved in the first place. it was just a thought i was already aware of the problem associated with them.

that's why I decided like two weeks ago to bore to 100mm, and use the 100mm Wiseco piston. For my circumstances this is the way to go.

 
but like boxer3 has stated no shop has ever had longevtiy out of a sleeved EJ. For whatever reason. Be it the full alum block or whatever these engines hate. And I do mean HATE being sleeved. Sure you can do it and it is done but the motor doesn't last for SH%T.

 
but like boxer3 has stated no shop has ever had longevtiy out of a sleeved EJ. For whatever reason. Be it the full alum block or whatever these engines hate. And I do mean HATE being sleeved. Sure you can do it and it is done but the motor doesn't last for SH%T.
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i know that, that's why its not an option... haha

like i said "that's why I decided like two weeks ago to bore to 100mm, and use the 100mm Wiseco piston. For my circumstances this is the way to go."

 
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