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