Kia Rio: Description

Continuous Variable Valve Timing (CVVT) system advances or retards the valve timing of the intake and exhaust valve in accordance with the ECM control signal which is calculated by the engine speed and load.

By controlling CVVT, the valve over-lap or under-lap occurs, which makes better fuel economy and reduces exhaust gases (NOx, HC) and improves engine performance through reduction of pumping loss, internal EGR effect, improvement of combustion stability, improvement of volumetric efficiency, and increase of expansion work.

This system consist of

The engine oil getting out of the CVVT oil control valve varies the cam phase in the direction (Intake Advance/Exhaust Retard) or opposite direction (Intake Retard/Exhaust Advance) of the engine rotation by rotating the rotor connected with the camshaft inside the cam phaser.

Components

1. Exhaust camshaft 2. Intake camshaft 3. Exhaust CVVT 4. Intake CVVT 5. Camshaft bearing cap 6. Camshaft front bearing cap 7. O-ring 8. Oil control valve (OCV) ada ...

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 ...

See also:

Input Speed Sensor Description
Input speed sensor (A) is a vital unit that measures the rate of rotation of the input shaft inside the transaxle and delivers the readings to the TCM. The sensor provides critical input data ...

TJ Joint Components
[LH] 1. BJ assembly 2. BJ circlip 3. BJ boot band 4. BJ boot 5. Shaft 6. TJ boot band 7. TJ boot 8. Spider assembly 9. Snap ring 10. TJ c ...

Engine Oil: Oil And Filter Replacement
   • Prolonged and repeated contact with mineral oil will result in the removal of natura ...