Broken Ring Land = Scratch On Bore Can It Be Fixed

[ruthless_one3k]

As the title states I cracked a ring land on #5 and scratched the bore. I have heard people say that you can just go over it with emery cloth and call it good. I know this will work in some cases, but I also know it has its limits. I dont really have any way of measuring the depth of the scratches but mostly it is just very light and I cant even feel it. There are 2 spots that I can feel although they are also very light just barely enough to feel, probably only .003" deep and about the same width at the worst part.

I know for a high hp engine any scratch at all is probably a no-go but my plan is just build it back to stock engine specs and stock boost for now. will a new piston and rings and a bit of emery cloth do the trick or do I need machine work. I know it is probably impossible to tell for sure without being here and seeing it first hand but if you have any expierence with this, please let me know what worked for you. cheers

[horrace]

Get a hone done and see how it looks, don't take to it with sandpaper, if the marks still there after a hone you can go with a bore and and lager pistons.

[r33_racer]

If you are deadset on fixing it yourself, Atleast get yourself a flex hone and clean the bore up with that rather then emery cloth. It will atleast keep the bore closer to round then leaving a flat spot where you would go over the scratches with emery cloth. While you are at it, do all the bores with that and chuck new rings in. If the scratches dont go after a hone, then it needs to be bored oversize.

[ruthless_one3k]

Get a hone done and see how it looks, don't take to it with sandpaper, if the marks still there after a hone you can go with a bore and and lager pistons.

Just called my personal mechanic back in the states (aka My father) and he gave me the same advice. So it sounds like a hone is what I'm doing! Thanks for the advice and the second opinion.

[r33_racer]

Hone yourself? or by a machine shop?

[The Mafia]

Dude, I'd get a Hone, acid dip, and deck done.

Would cost you around $250.

It really is worth the trouble and expense, as you won't have any issues then.

Set of standard rings would be about $100, and change the bearings while you are at it. Thats another $100.

You'll need a new head gasket - $about $50 if you find the right place.

Totalling around $500

If you skimp for a lousy $100, here and there, you'll be pulling the engine out and down again, wasting days of time, extra head gaskets, seals etc. Trust me, been there done that. Just do it the right way first up, because saving $100 isn't worth the hassle of pulling the motor out again.

[sucram]

Bore and hone is like $180 at the most

Those cylinder hones you put on drill bits are more designed for O ring type seals

[DVS JEZ]

Beware of metal peices in the engine from the busted piston.

[STATUS]

if you can feel the lip when you scrape your fingernail over it.... end of game... overbore time.