Milling The Crown Of Rb26 Piston

[Stronzo]

Hello,

The engine i`m building now is rb25 with rb26 pistons and crank. After measuring head cc it seems that i will get CR ~ 9.2 with a stock gasket -- too much for me. I don`t want to use thick headgasket because i don`t want to increase the squish clearance.

Is it possible to decompress the engine slightly with milling 0.5-1mm from the top of the piston dome? Is there any safe limit in mm for a stock rb26 piston?

Thanks in advance.

[Sydneykid]

Have you considered simply polishing the combustion chambers, no risk weakening pistons, lowers the compression ratio and polishing decreases the detonation potential on its own.

cheers

[Stronzo]

Thank you for advice, but it seems to me that it is hard to do it (polishing) equaly to all cylinders, and the price of error is too high

Аnyway -- my target CR is 8.7-8.8 -- is it possible to get 3+ cc only with polishing the combustion chamber?