machine work

[cyrez187]

is it worth doing a 3 angle valve grind and port n polish? thanks

 

[4UH8ERS]

is it worth doing a 3 angle valve grind and port n polish? thanks

You are running a turbo therefore do not...repeat DO NOT polish the intake and exhaust ports. On turbocharged vehicles the pressurized system benefits from the roughness of the port walls in keeping the air/gasoline mix atomized. You need an atomized mixture for good combustion.

You can however polish the combustion chamber, valves on the combustion chamber side and piston tops. It also helps to reduce the heat transfer to these parts.

You can do minor porting on a turbocharged engine to allow the ports to work properly and remove the manufacturing flaws. Your porting should be restricted to removing the excess material around the exhaust and intake port valve guides and cleaning up the area directly under the valve seat. (Do not undercut in the port are below the valve seat). If there are blobs of metal in the ports where material has filled in or restricted part of the port then you can remove these as well, however on a turbo engine porting like a normally aspirated engine is a waste of time and hurts performance.

if you know someone experienced in our heads that has done many before they might know when and where and how far to go on certain parts of the head to make decent gains, but its also easy to hurt performace as well if the person is not familiar with your application. There can be decent gains by headwork it just depends on whos doing the work and how much you would like to spend for the amount of gain you will recieve

hope this helps with your decision