D16Y8

Started the development of a new cylinder head for a new customer. This is  a D16Y8 head.
It's a weird head. Honda always seeks for performance but in  this one, looked for combustion efficiency instead high flow head. Air tends to flow more throught the right port and then making swirls to maximize
air fuel mix improving combustion.
This is for a D16 low boost turbo setup.
Done a 3 angle seat valve job, resurface the valve with 45º and 30º angles, light work in the valve throat, smoothing the short and long radius.
Achieved today 192CFM at .387 valve lift which is customers camshaft lift choice.
Next must do the remaining 75º and 15º valve seat angle job and see if we can get more CFM without loosing CFM at lower valve lifts.