cylinder crosshatching

[ChallengerHK]

Roughly, how many  miles could be on a block since a build if crosshatching is clearly visible?

[Cuda Cody]

@Chryco Psycho  might know, but I think it should always have some cross hatch pattern?     I can ask my machine shop guy when I see him this Thursday.

[Spikedog08]

So for us stupid members (me) . . . What is crosshatching?  I assume it is lines on the cylinder walls?   

[Cuda Cody]

Yes, you are right.  It is needing to help keep the oil on the walls and makes the engine last much longer.  Too little or shallow of a crosshatch and the cylinder walls will not retain enough oil causing premature failure of the rings.  Too deep of a cross hatch will let too much oil past causing the engine to burn that oil that gets by making it use excessive oil.  That excess oil will foul plugs and cause problems.

The cross hatched also help with new engines to seat the rings.  If you run a cheap air filter or none at all, the small dust partials that can enter the engine can wear down the cross hatch.

So for us stupid members (me) . . . What is crosshatching?  I assume it is lines on the cylinder walls?   

[HP_Cuda]

here's a quick video:
https://www.youtube.com/watch?v=myY_VmQw7RI

But basically its a method for treating the cylinder bore to keep a uniform diameter for the rings on the piston to seat against with no leaks.

You use a flex hone to do so:
http://www.brushresearch.com/flex-hone-tool.php

On a side note, when folks say "brake the glaze" they are referring to honing the cylinder.

[Chryco Psycho]

There are a lot of factors type of oil , stiffness of the rings putting pressure on the walls & ring material .
When you consider an engine might wear 3-4 though over 80,000 mies the cross hatch could last 10,000 miles or more 

[ChallengerHK]

I bought a block a while back with visible crosshatching throughout. Fingernail test is hit and  miss, though. 5.9 Magnum, was bone stock. I'm thinking it either has few miles, or few miles dince a rebiild.