2. most 4 valve per cylinder engines are DOHC because it's easier to design them that way. SOHC engines tend to be 2 valves per cylinder. of course, there are exceptions to both.
ang DOHC ba ay 4v/cyl = 16valve
and ang SOHC, 2v/cyl = 8 valve?

hindi bat 16valve na mga lumalabas ngayon ng SOHC?
e san naman napupunta ung ibang 8 valve?