Detonation damage on cylinder and piston
 

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.

https://cimg4.ibsrv.net/gimg/www.mia...af80f30ae0.jpg
https://cimg5.ibsrv.net/gimg/www.mia...15aee04fd4.jpg
https://cimg6.ibsrv.net/gimg/www.mia...817d447caf.jpg
https://cimg7.ibsrv.net/gimg/www.mia...614fbc30dc.jpg
https://cimg8.ibsrv.net/gimg/www.mia...62594e1f8f.jpg
https://cimg9.ibsrv.net/gimg/www.mia...4f18184fd6.jpg
https://cimg0.ibsrv.net/gimg/www.mia...f8c748627f.jpg
https://cimg1.ibsrv.net/gimg/www.mia...7493f5d51c.jpg
https://cimg2.ibsrv.net/gimg/www.mia...b2f8fe50d1.jpg
https://cimg4.ibsrv.net/gimg/www.mia...715c0a53bd.jpg

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.

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

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

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

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