N-VCT
Nissan Variable Cam Timing or Nissan Valve Timing Control System (commonly known as N-VCT, VCT, NVCS or NVTCS) is an automobile variable valve timing technology developed by Nissan. N-VCT was first introduced in 1987 on the VG30DE and VG20DET engine.
N-VCT varies valve timing by rotating the affected camshaft(s) relative to the sprocket; valve lift and duration are not altered. This rotation is achieved when an electric solenoid, controlled by the car's ECU, allows pressurized engine oil to flow into and through the cam and into a slave mechanism, axially advancing cam timing relative to the sprocket. Valve timing varies depending on whether engine speed is high or low and changes at fixed intervals. NVTCS is similar to Honda’s highly publicized VTEC (Variable Valve Timing and Lift Electronic Control System), but NVTCS is simpler, quieter, and requires no maintenance. Some Nissan engines only have N-VCT on the inlet cam (such as the GA16DE or RB25DE/DET) while others have it on both the inlet and exhaust cams. NVTCS was eventually phased out and replaced by Nissan's Continuous Variable Valve Timing Control System on newer engines such as the VQ and VK series.
Engines That Have N-VCT
- QG16DE
- QG18DE
- RB25DE (1993+) (intake only)
- RB25DET(1993+) (intake only)
- GA16DE
- SR20DE
- SR20DET
- VE30DE
- VG20DET
- VG30DE
- VG30DET
- VG30DETT
- VH45DE
See also
- Nissan's Continuous Variable Valve Timing Control System (CVTCS)
- Variable Valve Timing