What do these cylinders look like?

[CB7Man]

Ok this from my 90 EX, I dont see alot of exposed cylinders, these were exposed for 10 years.
Alot of dirt was inside, there was some sort of ooze inside the cylinders and covering the piston.
But how worn do they look?
Each picture is a different cylinder





Does anything look abnormal?

[evil_demon_01]

They don't look too bad to be honest, the only thing that would concern me is the circle in the first pic half way down the bore (and what appears to be rust spots 1/4 of the way down, but I'm not sure if that is just the camera.

Worst case scenario - get them honed.

[CB7Man]

Oh...well the engines running lol, passed smog, I was just wondering if they looked (or if you can even tell) worn or anything.

As far as noise wise, the bottom end sounds totally solid, no piston slap or anything. The head makes a racket! Head has 300,000 miles on it
The block has 82K, but the previous owner ran OUT of oil, so I was wondering if you could see anything.

[evil_demon_01]

Oh...well the engines running lol, passed smog, I was just wondering if they looked (or if you can even tell) worn or anything.

As far as noise wise, the bottom end sounds totally solid, no piston slap or anything. The head makes a racket! Head has 300,000 miles on it

Worn - No
The fact that you can still see the honing marks on the bores shows that they are not excessively worn.

[CB7Man]

Worn - No
The fact that you can still see the honing marks on the bores shows that they are not excessively worn.

You reffering to the cross hatching?
I thought cross hatching meant it was new lol

[evil_demon_01]

You reffering to the cross hatching?
I thought cross hatching meant it was new lol

Yep cross hatching / Honing marks.
If the cross hatching wasn't there, your engine would burn oil.
I've seen engines with excess of 300K with original cross hatching still in good condition. - Its normal to see it, If you can't - then there is an issue.

[CB7Man]

So a completely smooth cylinder wall would leak oil?
Sorry for my noobness, I havnt torn apart engines

[evil_demon_01]

Completely smooth walls would Burn oil, as the oil would leak past the rings.
Also it would provide Less lubrication for the piston to wall contact.

[CB7Man]

Then can you take out the rods and crank, re-hone with the head on?

[James Matteu]

To my knowledge, no. Honing is done from the top of the motor, not the bottom.

[wed3k]

yea you need to be able to overstroke the bore. a smooth cylinder doesnt mean burning oil. you cant feel a fresh cylinder that has been honed with 623 stones.

[bobbycos]

To my knowledge, no. Honing is done from the top of the motor, not the bottom.

exactly !!!

with the 623 stones and the proper lube. preferrably with the block bare and out of the car

[CB7Man]

Then whats with this new Teflon infused-coated cylinder walls on these new J series motors?
I thought super smooth was bad for oil leaking

[ChroNicBoosT]

naa, the cyl become smooth after new rings wear into newly honed cyl walls, just like brake pads wear into the new rotor surface. so even tho the cyl wall is "smooth", the combustion pressure keeps the rings pressed outward against the cyl walls perfectly. thats why if you ever re-ring your pistons, you auotmatically NEED to get the cyl walls rehoned so they "mate" together like whn you 1st "break in" your new brakes.

[wed3k]

just by rubbing your finger across the surface you wont feel a difference between a finish honed cylinder and a broken in motor one. however apply lots of psi and the surfaces are different.