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Nissan Ecology Oriented Variable Valve Lif … 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. VVT varies the valve timing throughout the RPM range. Together they function similarly to Honda's VTEC system. The SR20VE is the most common engine with NEO VVL. There have been two main versions of this engine. The first version made 187 hp (139 kW) and 145 lb⋅ft (197 N⋅m) torque. This engine was used by Nissan from 1997 to 2001. It is found in the Nissan Primera, Nissan Bluebird, and the Nissan Wingroad. The second variant of the SR20VE is found only in the 2001 and later P12 Nissan Primera. This version of the SR20VE makes 204 hp (152 kW), and 152 lb⋅ft (206 N⋅m) torque. This engine is commonly known as the SR20VE '20V'. Although, in automotive terms, '20V' would normally be interpreted as having twenty valves, this is incorrect. The name '20V' is the name of the trim level of the Nissan Primera that it is found in. It is also a shortened version of the name SR20VE. This engine has 16 valves like the rest of the SR20 engines. This newer '20V' engine, along with the SR20VET, were the only SR20 engines to get restyled valve covers. It also came with an upgraded intake manifold, which has longer runners and a larger 70 mm (2.8 in) throttle body (earlier SR20VE has 60 mm). Another version of the VVL SR engines, is the 1.6 L SR16VE. The engine block for the SR16VE is the same as the SR20VE; it also has the same cylinder bore. The crankshaft has a shorter stroke, which lowers the displacement, but allows the engine to safely rev to higher RPM. Although this engine has 1.6 L of displacement, it has more aggressive camshaft specifications. It manages to make 173 hp (129 kW). The camshafts from this engine are considered to be an upgrade for SR20VE owners. From 1997 to 1998, Nissan produced 500 limited-edition SR16VE N1 engines. These engines made 197 hp (147 kW). They had further upgraded camshafts, upgraded intake manifold using eight injectors and a larger 70 mm (2.8 in) throttle body. These engines were found in the limited-edition Nissan Pulsar VZ-R N1. They were only sold in Japan. The most powerful VVL engine so far is the SR20VET. The SR20VET is a turbocharged '20V' SR20VE. It uses a Garrett GT2560LS, and makes 280 PS (206 kW; 276 hp). Nissan's technical 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. as both camshafts engage at the same RPM.
, Il sistema Nissan Ecology Oriented Variabl … Il sistema Nissan Ecology Oriented Variable Valve Lift and Timing (conosciuto come VVL o NEO VVL) è un sistema sviluppato dalla Nissan, questo sistema funziona in modo simile al VTEC di Honda, variando la fasatura, la durata, l'apertura, tramite l'uso di , che permettono il passaggio d'utilizzo tra due diversi tipi di albero a camme.zo tra due diversi tipi di albero a camme.
, VVL,(ang. Nissan Ecology Oriented Variable … VVL,(ang. Nissan Ecology Oriented Variable Valve Lift and Timing) - system sterowania rozrządem poprzez przełączanie krzywek znajdujących się na wałku rozrządu opracowany przez Nissana. Umożliwia zmianę czasu otwarcia oraz wzniosu zaworów. Jest to system zbliżony do systemu VTEC, ale lewa i prawa krzywka posiadają ten sam profil. Przy niskich obrotach obydwa zawory są niezależnie napędzane przez krzywki o krótkim czasie otwarcia i niskim wzniosie. Przy wysokich obrotach wszystkie 3 dźwignie zostają spięte razem i napędzane przez krzywkę zapewniającą długi czas otwarcia i wysoki wznios. To rozwiązanie stosowane jest w układzie rozrządu typu DOHC zarówno na wałku ssącym, jak i wylotowym. Jest to system 3-stopniowy:
* 1 Faza (niskie obroty) - zarówno zawory dolotowe jak i wylotowe pracują przy ustawieniach typowych dla niskich obrotów. Zawory otwierają się w niewielkim stopniu, co sprzyja lepszemu napełnianiu cylindra. Mieszanka spalana jest dokładniej i efektywniej, dzięki czemu moc silnika oraz przebieg krzywej momentu obrotowego są bardzo korzystne, a przy tym jest na niskim poziomie. Kultura pracy jednostki napędowej jest przy tym bardzo wysoka.
* 2 Faza (średnie obroty) - zawory dolotowe pracują już na ustawieniach dla szybkich obrotów, natomiast zawory wylotowe na ustawieniach dla niskich obrotów
* 3 Faza (wysokie obroty) - zarówno zawory dolotowe jak i wylotowe pracują na ustawieniach dla wysokich obrotów. Zawory mają wówczas znacznie większy skok, a ich czas otwarcia jest dłuższy. Cylindry są jeszcze lepiej napełniane mieszanką paliwowo-powietrzną, co wpływa na maksymalne osiągi mocy i momentu obrotowego.ksymalne osiągi mocy i momentu obrotowego.
, NEO VVL（NEO Variable Valve Lift and timing）は、日産自動車が開発した4サイクルエンジン用の可変バルブタイミング・リフト機構および、その名称である。
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NEO VVL（NEO Variable Valve Lift and timing）は、日産自動車が開発した4サイクルエンジン用の可変バルブタイミング・リフト機構および、その名称である。
, VVL,(ang. Nissan Ecology Oriented Variable … VVL,(ang. Nissan Ecology Oriented Variable Valve Lift and Timing) - system sterowania rozrządem poprzez przełączanie krzywek znajdujących się na wałku rozrządu opracowany przez Nissana. Umożliwia zmianę czasu otwarcia oraz wzniosu zaworów. Jest to system zbliżony do systemu VTEC, ale lewa i prawa krzywka posiadają ten sam profil. Przy niskich obrotach obydwa zawory są niezależnie napędzane przez krzywki o krótkim czasie otwarcia i niskim wzniosie. Przy wysokich obrotach wszystkie 3 dźwignie zostają spięte razem i napędzane przez krzywkę zapewniającą długi czas otwarcia i wysoki wznios. To rozwiązanie stosowane jest w układzie rozrządu typu DOHC zarówno na wałku ssącym, jak i wylotowym. Jest to system 3-stopniowy:k i wylotowym. Jest to system 3-stopniowy:
, Il sistema Nissan Ecology Oriented Variabl … Il sistema Nissan Ecology Oriented Variable Valve Lift and Timing (conosciuto come VVL o NEO VVL) è un sistema sviluppato dalla Nissan, questo sistema funziona in modo simile al VTEC di Honda, variando la fasatura, la durata, l'apertura, tramite l'uso di , che permettono il passaggio d'utilizzo tra due diversi tipi di albero a camme.zo tra due diversi tipi di albero a camme.
, Nissan Ecology Oriented Variable Valve Lif … 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. VVT varies the valve timing throughout the RPM range. Together they function similarly to Honda's VTEC system. 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.ssions to keep up with emission standards.
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NEO VVL
, VVL
, Nissan VVL engine
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