Cylinder wall scratch. Bore or not?

[talonsteve25]

So just the other day my dad found a scratch on both 1 and 2 cylinders. The scratch in 1 is about 1 and a half inches and 2 about a half inch long. But i didnt even notice them they were so small, but you can feel them with a finger nail. So i was wondering how deep they have to be or how bad for me to have to go and bore the motor?
I can take some pictures if needed to.

 

[BogusSVO]

With those scratches, you may have a touch of oil smoke. But they are not an engine killer.

 

[11Banger]

With those scratches, you may have a touch of oil smoke. But they are not an engine killer.

This. The "damages" to the cyl wall isn't as bad as I thought. I would just run the car like it is now. But once you free up some cash & down time & would just start fresh with a bore & hone.

 

[DSM_GSX01]

I say bore it over .020 and call it a day. Just to make sure the pistons make a good seal.

 

[Breezio69]

Is there a reason you'd also need new rods? A machine shop should only charge around 15-20 per hole on a bore, sell the new pistons you've already got and get the .020 over pistons. Youd be in it $80 or so for a bore and the difference of what you sell your pistons for to get new ones.

Just another perspective.

It would suck to put in all that work and be unhappy about the fact your new engine burns oil... I personally wouldn't "live" with that

 

[BogusSVO]

Is there a reason you'd also need new rods? A machine shop should only charge around 15-20 per hole on a bore, sell the new pistons you've already got and get the .020 over pistons. Youd be in it $80 or so for a bore and the difference of what you sell your pistons for to get new ones.

Just another perspective.

It would suck to put in all that work and be unhappy about the fact your new engine burns oil... I personally wouldn't "live" with that

You are right, the block should have been bored to start and the proper sized pistons hung on the rods.

Here is the kicker tho, a good chance the new pistons on the rods will be junk when they are pressed off. They will deform, crack or just bust into pieces when removed. Press fit pistons have that habit.

So The $80 bore hone, will add $40-$60 to R&R pistons, plus the cost of the piston and ring set, plus the rebalance of the engine if it was done before.

So about another $300-500 spent.

 

[11Banger]

I say bore it over .020 and call it a day. Just to make sure the pistons make a good seal.

Which would require new pistons which he was trying to avoid.

 

[Breezio69]

You are right, the block should have been bored to start and the proper sized pistons hung on the rods.

Here is the kicker tho, a good chance the new pistons on the rods will be junk when they are pressed off. They will deform, crack or just bust into pieces when removed. Press fit pistons have that habit.

So The $80 bore hone, will add $40-$60 to R&R pistons, plus the cost of the piston and ring set, plus the rebalance of the engine if it was done before.

So about another $300-500 spent.

So brand new pistons can't be taken off a rod? I mean I could see for instance my 193k pistons just crumbling at the sight a of a press, but un-run pistons are just stuck there for good... I don't think this needs to be an arguement but i do disagree.

But to take your advice... so he has pistons and rods to sell now. Gets back 80% of his $ towards another set, then spends $80 on a bore... still don't even see a $200 difference unless he's getting like $1600 worth of pistons and rods in place of his say $700 setup he has now