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