Kia Forte: CVVT & Camshaft 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.

CVVT & Camshaft Components

1. Camshaft bearing cap 2. Camshaft front bearing cap 3. Exhaust camshaft 4. Intake camshaft 5. Exhaust CVVT assembly 6. Intake CVVT assembly ...

CVVT & Camshaft 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:

Component Location
1. Start Stop Button(SSB) 2. FOB key 3. Smart key unit 4. Interior antenna 5. Trunk antenna 6. Door handle & door antenna 7. Bumper antenna 8. Trunk lid open sw ...

Special Service Tools
Tool Name / Number Illustration Description Steering wheel puller 09561-11001 Remove the steering wheel ...

Component Location
1. Head lamp (Low) 2. Head lamp (High) 3. Position lamp / DRL 4. Turn signal lamp 5. Front fog lamp 6. Turn signal lamp (Outside mirror) 7. Overhead console lamp 8. ...