Depends on which system you're referring to.Aimer said:Hows it work?
What are the benefits? (pros/cons)
And when does it kick in?
EDIT:5. CVVT (CONTINUOUSLY VARIABLE VALVE TIMING) SYSTEM
The CVVT unit is mounted on the exhaust camshaft and controls the intake valve timing by advancing and retarding the intake camshaft in relation to the exhaust camshaft. The Powertrain Control Module (PCM) controls the amount of timing advance up to 40° (crank angle) 20° (cam angle) depending on engine load and speed. The three main advantages of the CVVT system are:
1. Improved performance at high rpm and increased torque at low rpm
through increased volumetric and thermodynamic efficiencies.
2. Improved fuel economy due to better cylinder charge achieved through increased valve overlap.
3. Reduced NOx emissions due to the EGR effect created by optimizing valve