![Kia Optima: [CVVT System Mode] - CVVT (Continuously Variable Valve Timing) System. Description
and Operation - Exhaust Emission Control
System - Emission Control System - Kia Optima TF 2011-2025 Service Manual](images/pages/small/3.png)
Kia Optima: [CVVT System Mode]
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(1) Low Speed / Low Load |
(2) Part Load |
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(3) Low Speed / High Load |
(4) High Speed / High Load |
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Driving Condition |
Exhaust Valve |
Intake Valve |
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Valve Timing |
Effect |
Valve Timing |
Effect |
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(1) Low Speed /Low Load |
Completely Advance |
* Valve Under-lap * Improvement of combustion stability |
Completely Retard |
* Valve Under-lap * Improvement of combustion stability |
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(2) Part Load |
Retard |
* Increase of expansion work * Reduction of pumping loss * Reduction of HC |
Retard |
* Reduction of pumping loss |
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(3) Low Speed /High Load |
Retard |
* Increase of expansion work |
Advance |
* Prevention of intake back flow (Improvement of volumetric
efficiency) |
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(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 contro ...
Engine Control/Fuel System
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h3 {color:#0033CC}
h2 {color:#008000}
h1 {color:#FF0000}
...
See also:
To Resume the Preset Speed
The vehicle will automatically resume the speed set prior to cancellation when
you press and release the RES/ACCEL switch, providing the vehicle speed is above
25 mph (40 km/h). ...
All season tires
Kia specifies all season tires on
some models to provide good performance
for use all year round,
including snowy and icy road conditions.
All season tires are identified
by ALL SEASON and/o ...
Keys
The key code number is stamped on the plate attached to your key set. Should
you lose your keys, this number will enable an authorized Kia dealer to duplicate
your keys easily. Remove this plate ...
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