4g13 piston.... maximum oversize

[vr2turbo]

You shave too much off the head, cam timing will change unless you have adjustable cam to counter back....

 

[Izso]

Before i skim my 4G13 head, i saw below the side got marking i think is the skim limit that your can go. That marking is about 1 mm, and i just skim is flat. Up until now my car does not face any overheat issues, even i rev to 6000 rpm and drive up to 180 km speed. Refer attach picture.

Mine was skimmed to the marking max also

 

[waltertan]

You shave too much off the head, cam timing will change unless you have adjustable cam to counter back....

You can still adjust with your timing belt tensioner.

---------- Post added at 07:40 AM ---------- 6 hour anti-bump limit - Previous post was at 07:38 AM ----------

Mine was skimmed to the marking max also

In that case, i leave my spar head original for my future turbo setup. As you have skim to max like my already overheat and warped the head.

 

[waltertan]

Here is my 4G12 low compression ratio piston install my my 4G13 photo for sharing.

 

[vr2turbo]

You can still adjust with your timing belt tensioner

If skim a little, Belt tensioner will help, but too much off, if not mistaken the cam angle will differs slightly...

 

[^pomen_GTR^]

Here is my 4G12 low compression ratio piston install my my 4G13 photo for sharing.

looks like low comp turbo piston design...easy to BOT later

 

[waltertan]

Well I still feel not difference before and after skim.

---------- Post added at 06:24 PM ---------- 6 hour anti-bump limit - Previous post was at 06:23 PM ----------

As for the extra head still have not decide to keep it for turbo setup or not