information about this engine states that it is 9:1 compression ratio, but it really adds up to 8.8:1. 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. In 1998 Nissan's RB engine was also improved using the NEO Head Technology (but no VVL), which provided the motor better fuel economy and lower exhaust emissions to keep up with emission standards. 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. On the SR20VE, the intake camshaft is switched at 5000 rpm, and the exhaust at 6500 rpm. However this trait was not included on the newer '20V' version, as both camshafts engage at the same RPM. See also Nissan Continuous Variable Valve Timing Control Nissan SR engine Nissan Variable Cam Timing Nissan Variable Valve Event and Lift Sources New Zealand Primera Club Nissan Primera Owners Club - Valuable Primera Information SR20forum VVL FAQ FAQ about VVL Nissan Japan Official Nissan of Japan site NeoVVL Owners Club The Resource for the NeoVVL Engine Nissan Variable valve timing