Nissan Ecology Oriented Variable Valve Lift and Timing (commonly known as VVL & VVT) is an automobile variable valve timing technology developed by Nissan.

VVL varies the duration, and lift of valves by using hydraulic pressure switch between two different sets of camshaft lobes.

The crankshaft has a shorter stroke, which lowers the displacement, but allows the engine to safely rev to higher RPM.

Nissan's technical information about this engine states that it is 9:1 compression ratio, but it really adds up to 8.8:1.

[citation needed] Compared to the SR20DET (used in the Nissan Silvia, and Bluebird), the SR20VET (aside from having VVL technology) has improved airflow in the cylinder head, higher compression, and also improved coolant passages.

One difference from Honda's VTEC system is that NEO VVL engages the change of intake and exhaust cams independently for a flatter, more consistent power band.

However this trait was not included on the newer '20V' version, as both camshafts engage at the same RPM.