Does Nissan have variable valve timing?
Does Nissan have variable valve timing?
Nissan Variable Timing control or Nissan Valve Timing Control System (commonly known as N-VTC, VTC, NVCS or NVTCS) is an automobile variable valve timing technology developed by Nissan. N-VTC was first introduced in 1987 on the VG30DE and VG20DET engine.
How does Nissan variable valve timing work?
Variable valve timing works by changing the timing interval for fuel and air injection into the combustion chamber in order to maximize burn rates, thus lowering fuel usage. Most VVT engines can dynamically change these ratios and the timing of those injections at multiple RPM rates.
Who pioneered variable valve timing?
Developed by Giovanni Torazza in the late 1960s, the system used hydraulic pressure to vary the fulcrum of the cam followers (US Patent 3,641,988). The hydraulic pressure changed according to engine speed and intake pressure.
What is Vvel Nissan?
The letters VVEL are important to the architecture of Nissan engines. Those four letters stand for Variable Valve Event and Lift. What that refers to is a Nissan engine that operates without the use of a throttle body. Instead, the air flowing into the engine is metered by way of the cams and valves.
What was the name of the Nissan Variable Timing System?
Variable Timing Control (VTC, sometimes called Variable Cam Timing (VCT), or NVCS (Nissan Variable [timing] Control System or Nissan Variable Cam System) was the name given to the variable cam phasing system featured on the VG30DE (TT) and other similar engines from the era.
Where is the Variable Timing Control on a VG30DE?
Variable Timing Control was, at least in the case of the VG30DE, used only on the intake cams. Interestingly, the exhaust side of the head features a cutout that would otherwise appear to accommodate a VTC solenoid.
Why does the Nissan VG30DE have a VTC system?
Most engines compromise somewhere in the middle, but VTC allowed Nissan to have it’s cake and eat it, too. In short, the VTC system allowed the ECU to advance the cam phasing on the intake cams, depending on different engine situations. This allowed the VG30DE to maintain good low-end torque and smoothness, without sacrificing top-end power.