Kia Rio Manuals

Kia Rio: [CVVT System Mode] - CVVT & Camshaft - Cylinder Head Assembly - Engine Mechanical System - Kia Rio UB 2012-2025 Service ManualKia Rio: [CVVT System Mode]


(1) Low Speed / Low Load
 (2) Part Load




(3) Low Speed / High Load
 (4) High Speed / High Load





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

Operation Principle
The CVVT has the mechanism rotating the rotor vane with hydraulic force generated by the engine oil supplied to the advance or retard chamber in accordance with the CVVT oil control valve con ...

Removal
1. Remove the cyliner head cover. (Refer to Timing System) 2. Remove the timing chain cover. (Refer to Timing System) ...

See also:

Foot Actuator (With Auto Defogging System) Replacement
1. Disconnect the negative (-) battery terminal. 2. Remove the glove box housing. (Refer to BD group - “Crash pad”) ...

Trunk Lid Adjustment
1. After loosening the trunk lid hinge (A) mounting bolt, adjust the trunk lid by moving it up or down, or right or left. 2. Adjust the tru ...

Front Seat Replacement
   • When removing or installing the front passenger seat, be sure to initialize the Weight ...

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