What was your piston-to-wall clearance? What side of the piston are these scratches on? Intake or exhaust? Both? Was the engine assembled by a shop? Was this a turbo engine? At first glance it looks like your piston-to-wall clearance was just a hair on the tight side and the engine got a good amount of heat in it at one point like during a long 5th gear pull, etc.

As far as being repairable it depends. If money is an issue and the scratches aren't too deep, you COULD sand & polish the skirts. I'm not saying you should but you could. The pistons will run small in certain spots and if there's any issues with the cylinders you'll be right back to where you are now. Best to fix it the right way and start over with a new set in some freshly machined cylinders.

 

 

what is very rich mixture? do u have a wideband? looks like a bad p2w clearence for me.

 

 

12-13 is not Rich enough to make this scratches...8-10afr on long Time maybe...this scratches are Mechanical problem.

 

More like half-*** install job by idiots at the shop. OP, I would refrain from going back there.

 

Not sure if you played with the rings at all when you took your pistons out but, in your top picture all of the end of the oil rings are all on top of each other. This is also a sign someone doesn't know what they're doing.

 

Thank you guys!

P2W clearance was tight. Clearance was 0,046mm. Specification sheet says 0,0762 mm.

Is it that problem?

Thank you.



Josef

 

Yes

 

there specs are to tight for my liking and most engine builders in the honda world! dont go tighter than .0035-.0040 on a turbo motor I dont care what the spec sheet says for under 500 hp

 

0.0040 is the best way for cp, je, wiseco and arias

 

thats to tight!!!! 0.04mm is for oem cast pistons.