Scaratches on pistonīs and sleaves.... WHY ???
#1
Scaratches on pistonīs and sleaves.... WHY ???
hi
why does this happen
Can this be honed and can pistons be used again....
this are very fine scratches not deep, you can not feel any marks at all whith fingers.....
This is a 3-4K miles motor
thanks Baezi
why does this happen
Can this be honed and can pistons be used again....
this are very fine scratches not deep, you can not feel any marks at all whith fingers.....
This is a 3-4K miles motor
thanks Baezi
#2
4in stroker crank?
If so.. Its a bit on the normal side. Normally that happens, but also hammering on it before the engine has come up to temp can also accelerate this kind of wear.
Piston rock a BDC is a bitch.
If so.. Its a bit on the normal side. Normally that happens, but also hammering on it before the engine has come up to temp can also accelerate this kind of wear.
Piston rock a BDC is a bitch.
#3
can this be honed and pistons used again????
i spun a rod bearing and had a crack in my crank.
and this happened 2 months before
after knock...
whatīs the best way to do, buy a new Crank and put it back together
or throw all this away and re-bore the block
iīm using this as a NA 500rwhp motor and plans are for 150-200 shots of NOS
thanks
baezi
#4
What caused the knock event, was the tune off that bad?
Crank is trash, are these 4.005 pistons?
If you cant fingernail the walls I would clean the walls up very slightly, and reuse the pistons.
Are these coated pistons too? The wear on the sides looks a bit on the harsh side for 4000 miles, but they arent in front of me so it could be the photo is just making it look worse then it is.
If I where in your shoes, I would purchase a new rotating assembly... But you could re-use the rods/piston combo if your on a budget.
Crank is trash, are these 4.005 pistons?
If you cant fingernail the walls I would clean the walls up very slightly, and reuse the pistons.
Are these coated pistons too? The wear on the sides looks a bit on the harsh side for 4000 miles, but they arent in front of me so it could be the photo is just making it look worse then it is.
If I where in your shoes, I would purchase a new rotating assembly... But you could re-use the rods/piston combo if your on a budget.
#5
What caused the knock event, was the tune off that bad?
Crank is trash, are these 4.005 pistons?
If you cant fingernail the walls I would clean the walls up very slightly, and reuse the pistons.
Are these coated pistons too? The wear on the sides looks a bit on the harsh side for 4000 miles, but they arent in front of me so it could be the photo is just making it look worse then it is.
If I where in your shoes, I would purchase a new rotating assembly... But you could re-use the rods/piston combo if your on a budget.
Crank is trash, are these 4.005 pistons?
If you cant fingernail the walls I would clean the walls up very slightly, and reuse the pistons.
Are these coated pistons too? The wear on the sides looks a bit on the harsh side for 4000 miles, but they arent in front of me so it could be the photo is just making it look worse then it is.
If I where in your shoes, I would purchase a new rotating assembly... But you could re-use the rods/piston combo if your on a budget.
The tune was way off at that time yes.....
and the pistons are 4.005inch yes, and piston that the photos are off is the worst one, the others are better, and some much much better.
can this have something to do whith type of oil used
the motor *shortblock* was bought new in spring 2009 and it costed well over $6000 at that time and only used not more then 4k miles
then off course i wouldn't like to buy new rotating assembly now ,
but then again i'm not ready to put the motor back together and have some problems whith it right after i break it in.....
i definently need new Crank, one new ROD, and all bearings...
BUT the question is, Can i hone the block, use the used pistons/rods whith new rings..
and will the motor be the same
thanks
Baezi
#6
Your top rings have the moly blown clean off so massive detonation was occurring on this deal and the pistons got hot and got big because of that as well. You might be able to just hone it or might not depending on true condition of block. The scratches are from the debris going through the engine but are no big deal. You'd just have to see if it's fixable but it probably is.
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#8
#9
#11
Would no one use these pistons again....
nr. 8 is missing on the pic., but it lookes the best nearly no scratch
I would much like to hear more coments on this here....
some say pistons can be used again, but offcourse better to buy new ones.
but i don't wante to buy new for $700-800 if i really don't need to
thanks
Baezi
#12
No one can really tell you anything without seeing pistons first hand. The skirts have the coatings worn off but again this could be from overheating and from the bottom of the cylinder not being deburred at all.
#13
and they are worn diffirently...
by the looke at it and feeling it it doesn't feel deep worn only just enough to rub the coat off....
here is the worst one
passengers side > nr. 2 and 6 are worst
nr.4 and 8 are nearly like new, no scratch to talk about
driversside nr. 1 3 5 7 are all the same , just a little rubb in the middle
as you can see on the pic here
so does this give you guys better view...
thanks for all your help
Baezi
#14
They are "probably" reusable like I said initially but just hard to tell from pictures alone. All rings should freely move with no lifted or crushed ring lands. You at a minimum will need new rings and maybe a touch up hone job.
#15
for you comments...
all rings move freely as they are now
can this happen in after a bit lean WOTS for example
thanks
Baezi
#16
I don't know about any of that but it might have been lean or might be a bit high in compression or might have had too much timing or might not have had good gas at that point. Don't really know.
#17
#20
junk
Looks like all junk to me I wouldnt reuse those pistons unless its a drag car! finding a machine shop that knows how to work on ls1 blocks out by me is pretty hard good luck to you! that thing has to be smoking blue going down the road