This VVT is controlled to change the valve overlap of the intake valve and {HEAD ~ an exhaust valve}, thereby adjusting {TAIL ~ the suction} and exhaust in and from a combustion chamber 
adjusting
This VVT is controlled to change the valve overlap of the intake valve and { HEAD ~ an exhaust valve } , thereby adjusting { TAIL ~ the suction } and exhaust in and from a combustion chamber
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH