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Home >> Kia >> 2016 >> Optima SX Limited >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 89 (Cylinder Head Assembly - 1.6L - Optima (Except HEV)) >> CVVT & Camshaft >> Description and Operation >> Operation Principle >> [CVVT System Mode]

[CVVT System Mode]

WARNING: This page is about a different variant/trim than selected.
Fig 1: CVVT System Mode Graph
G11822909Courtesy of KIA MOTORS AMERICA, INC.
Fig 2: CVVT System Modes
G11822910Courtesy of KIA MOTORS AMERICA, INC.
Driving Condition Exhaust Valve Intake Valve
Valve Timing Effect Valve Timing Effect
(1) Low Speed/Low Load Completely Advance * Valve Under-lap
* Improvement of combustion stability		 Completely Retard * Valve Under-lap
* Improvement of combustion stability
(2) Part Load Retard * Increase of expansion work
* Reduction of pumping loss
* Reduction of HC		 Retard * Reduction of pumping loss
(3) Low Speed/High Load Retard * Increase of expansion work Advance * Prevention of intake back flow (Improvement of volumetric efficiency)
(4) High Speed/High Load Advance * Reduction of pumping loss Retard * Improvement of volumetric efficiency
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