1g vs 2g head (combustion chamber)

[motoman358]

I read somewhere that the 2g head had a more efficient combustion chamber, does anyone know the size of the 2g combustion chamber vs the 1g?

 

[RyanJ]

I think it has to do with the 2g having a more direct angle of entry on the intake. This leads to higher velocity air into the chamber, a better fuel/air mixture and better combustion.

 

[nightspeed87]

i think maybe you have it backwards with 1st g vs 2ndg heads

http://www.roadraceengineering.com/1g2gheadswaptechtip.htm

 

[motoman358]

I know people switch from the 2g head to the 1g head because of the port sizes, I was inquiring about the combustion chamber. Does anyone have the volume and valve angles of the 1g and 2g heads?