The air-fuel mixture required for combustion 
is guided in by opening and closing the intake valves.
The movement of the valve is determined 
by the profile of the cam lobe.
There are ideal cam profiles for 
low- to mid-rpm and for high-rpm.
A VVA system alternates between 
these two cams based on engine rpm,
delivering the right combustion characteristics
to reap the benefits of both.
This helps bring good ridability 
across a wide rpm range.
