bro

I pulled the engine after I found out that there was some serious detonation present. Now I need some help what todo. The scoring in the cylinder is bad, but when I go over with my nail it barely not catches. But almost half of the cylinder is effected by the scoring.

I'm hoping to replace the pistons and do a hone so that I don't have to bring the engine to the shop. Or have the pistons reworked by turning? What do you guys think?

15 PSI turbo with some trackday application.

der_vierte

There is only one solution:
Rebuild engine.
You don't want a different set of pistons in that block and if the rest is good, go a bit deeper.
Put in some forged rods and +1mm pistons and you are good to go.

bro

Thank you for the reply. The pistons are already +1. And the rods are forged as well. So bigger pistons is not an option.

der_vierte

Go 84,5 or 85mm. If you can't really feel the scratches, +0,5 is more than enough.
Plenty of options to keep that short block running

ryansmoneypit

iTrader: (6)

No cross hatch left. The bores are smoked. No single ball hone will fix that.

Savington

iTrader: (31)

That's going to a machine shop whether you like it or not