Nissan NEO VVL Valve Timing.
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Nissan Motor Company, has what is called Nissan Ecology Orientated Variable Valve Lift and Timing. The Neo VVL engine was developed by Nissan around 1997. It saw limited release on some models. This in essence is a system similar to the Honda VTEC valve lift system, but is also has variable valve timing. This means that on a given rotational range, the engine will change the lift and timing, on the intake and exhaust cam independently. The NEO VVL engine has a camshaft with two different cam lobe profiles. When one cam profile is no longer needed or after 5000 RPM, the lift profile changes, and allows the engine to keep putting out power all the way to the redline. Neo VVL engines can generally rev to around 8200 RPM in stock form. This in effect has the best of both worlds, a great idle response and high RPM power.
The Neo VVL engine changes the cam profiles independently. The Intake cam changes first, and then the Exhaust camshaft thereafter. Other manufactures, like Honda's V-Tec and Toyota's VVTi switch both cams together. The end result is greater power generation on the smooth side.
The Nissan Neo VVL uses two separate camshaft profiles. One profile works best at low RPMs, while the other is meant for higher engine revolutions. It also uses 3 activation stages. The low and high RPM profiles, are effected by means of a ...
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