Piston surface....
 

i was wondering about the diffrence from your typical casted piston surface, and the forged polished surface of a piston. I would image the polished, ultra smooth surface would help control detonation.. but what else.. better blast.. what....

Re: Piston surface.... (DewMota)
 

http://images.honda-tech.com/set1//smile/emcrook.gif

Re: Piston surface.... (DewMota)
 

i'll post a picture, maybe that will help. http://images.honda-tech.com/ht/1/ht2.jpg

Re: Piston surface.... (DewMota)
 

I am no piston guru, but from what I read, the top of the piston should be as smooth as possible. It should be free of burrs, and any sharp edges should be sanded down. Also, I read that polishing the tops of the piston helps. Anything to keep hot spots down (sanding sharp edges) and keep carbon and other risiduals from bonding to the piston top (polishing), helps to prevent detonation.

Re: Piston surface.... (KingDsi)
 

Even some new forged pistons can go through the sanding and polishing