: By optimizing valve overlap, VVT can act as an internal Exhaust Gas Recirculation (EGR) system, reducing nitrogen oxide (NOx) formation.
: VVT adjusts valve opening and closing times across all RPM ranges to ensure optimal cylinder charging. Download Variable Valve Timing pdf
: Documentation distinguishes between cam-phasing (shifting camshaft angle) and cam-changing (switching between different cam profiles). What to Look for in a VVT PDF VVT Systems - Engine Professional : By optimizing valve overlap, VVT can act