Nissan Ecology Oriented Variable Valve Lift and Timing (commonly known as VVL & VVT) is an automobilevariable 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 187hp (139kW) and 145lb⋅ft (197N⋅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 204hp (152kW), and 152lb⋅ft (206N⋅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 70mm (2.8in) throttle body (earlier SR20VE has 60mm).
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 173hp (129kW). 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 197hp (147kW). They had further upgraded camshafts, upgraded intake manifold using eight injectors and a larger 70mm (2.8in) 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 280PS (206kW; 276hp). Nissan's technical information about this engine states that it is 9:1 compression ratio, but it really adds up to 8.8:1.[citation needed] 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.
VTEC is a system developed by Honda to improve the volumetric efficiency of a four-stroke internal combustion engine, resulting in higher performance at high RPM, and lower fuel consumption at low RPM. The VTEC system uses two camshaft profiles and hydraulically selects between profiles. It was invented by Honda engineer Ikuo Kajitani. It is distinctly different from standard VVT systems which change only the valve timings and do not change the camshaft profile or valve lift in any way.
In internal combustion engines, variable valve timing (VVT) is the process of altering the timing of a valve lift event, and is often used to improve performance, fuel economy or emissions. It is increasingly being used in combination with variable valve lift systems. There are many ways in which this can be achieved, ranging from mechanical devices to electro-hydraulic and camless systems. Increasingly strict emissions regulations are causing many automotive manufacturers to use VVT systems.
VVT-i, or Variable Valve Timing with intelligence, is an automobile variable valve timing technology developed by Toyota. The Toyota VVT-i system replaces the Toyota VVT offered starting in 1991 on the 5-valve per cylinder 4A-GE engine. The VVT system is a 2-stage hydraulically controlled cam phasing system.
MIVEC is the brand name of a variable valve timing (VVT) engine technology developed by Mitsubishi Motors. MIVEC, as with other similar systems, varies the timing of the intake and exhaust camshafts which increases the power and torque output over a broad engine speed range while also being able to help spool a turbocharger more quickly and accurately.
The GM Ecotec engine, also known by its codename L850, is a family of all-aluminium inline-four engines, displacing between 1.4 and 2.5 litres. While these engines were based on the GM Family II engine, the architecture was substantially re-engineered for the new Ecotec application produced since 2000. This engine family replaced the GM Family II engine, the GM 122 engine, the Saab H engine, and the Quad 4 engine. It is manufactured in multiple locations, to include Spring Hill Manufacturing, in Spring Hill, Tennessee while the engine block and cylinder heads are cast at Saginaw Metal Casting Operations in Saginaw, Michigan.
The VK engine is a V8 piston engine from Nissan. It is an aluminum DOHC 4-valve design.
The VQ is a family of V6 24V automobile engines developed by Nissan with displacements varying from 2.0 L to 4.0 L. It is an aluminum block DOHC 4-valve design with aluminum heads. It is fitted with Nissan's EGI/ECCS sequential multi-point fuel injection (MPFI) system. Later versions feature various implementations of variable valve timing and replace MPFI with direct fuel injection. The VQ series engine was honored by Ward's 10 Best Engines list almost every year from the list's inception. The VQ series replaced the VG series of engines.
The RB engine is an oversquare 2.0–3.0 L straight-6 four-stroke gasoline engine from Nissan, produced from 1985 to 2004, and will be continuing production in 2019, after a 15 year hiatus. The RB followed the 1983 VG-series V6 engines to offer a full, modern range in both straight or V layouts.
The VG engine family consists of V6 engines designed and produced by Nissan for several vehicles in the Nissan lineup. The VG series was introduced in 1983, becoming Nissan's and Japan's first mass-produced V6 engine. VG engines displace between 2.0 L and 3.3 L and featured an iron block and aluminum heads at a 60° vee-angle. The early VG engines featured a SOHC arrangement with 2 valves per cylinder. Later versions featured a slightly different block, a DOHC arrangement with 4 valves per cylinder, and N-VCT, Nissan's own version of variable valve timing, for a smoother idle and more torque at low to medium engine speeds. The production blocks and production head castings were used successfully in the Nissan GTP ZX-Turbo and NPT-90 race cars which won the IMSA GT Championship three years in a row.
The QG engine is a 1.3 L (1,295 cc), 1.5 L (1,497 cc), 1.6 L (1,597 cc) and 1.8 L (1,769 cc) straight-4 piston engine from Nissan. It is a lean-burn aluminum DOHC 4-valve design with variable valve timing and optional NEO Di direct injection.
The Nissan SR engine is a 1.6 L (1,596 cc), 1.8 L (1,838 cc) or 2.0 L (1,998 cc) straight-four, four-stroke gasoline internal combustion engine manufactured by Nissan Motors. It has an aluminum head and block with steel sleeves and has a DOHC 4-valve design, with variable valve timing on select models. The engine was used in many small to medium Nissan vehicles including high-performance turbocharged variants. It was designed by Nissan as a replacement for the earlier CA series of engines. Power output shown is JIS Net PS or ECE Net kilowatts unless otherwise indicated.
The CA engine is a 1.6 to 2.0 L Inline-4 piston engine from Nissan designed for a variety of smaller Nissan vehicles to replace the Z engine and some smaller, four-cylinder L series engines. It is an iron block, aluminum head design with a timing belt, cheaper to make than the timing chain setup on the Z and L engines. Earlier versions featured SOHC and eight valves. The new CA block design was a scaled-up E series block with timing shaft and other ancillaries removed. The oil pump is fitted directly onto the crank nose and the distributor is driven by the end of the camshaft. Like the E series and the A block from which the E was derived, Nissan used a taller block for the largest stroked 2.0-litre engine. The CA was designed to be compact and light, with a CA16 requiring only 195 litres of space, while weighing 23% less at 115 kg (254 lb). The engine was called the "CA" series for Clean Air, due to the installation of Nissan emission reducing technology, called NAPS-X.
The Toyota JZ engine family is a series of inline-6 automobile engines. A replacement for the M-series inline-6 engines, the JZ engines were 24-valve DOHC engines in 2.5- and 3.0-litre versions.
Honda's first production V6 was the C series; it was produced in displacements from 2.0 to 3.5 liters. The C engine was produced in various forms for over 20 years (1985–2005), having first been used in the KA series Legend model, and its British sister car the Rover 800-series.
The SR20DET is part of the SR family of engines from Nissan.
The Honda K-series engine is a line of four-cylinder four-stroke car engine introduced in 2001. The K-series engines are equipped with DOHC valvetrains and use roller rockers on the cylinder head to reduce friction. The engines use a coil-on-plug, distributorless ignition system with a coil for each spark plug. This system forgoes the use of a conventional distributor-based ignition timing system in favor of a computer-controlled system that allows the ECU to control ignition timings based on various sensor inputs. The cylinders have cast iron sleeves similar to the B- and F-series engines, as opposed to the FRM cylinders found in the H- and newer F-series engines found only in the Honda S2000.
The Honda F-Series engine was considered Honda's "big block" SOHC inline four, though lower production DOHC versions of the F-series were built. It features a solid iron or aluminum open deck cast iron sleeved block and aluminum/magnesium cylinder head.
The MR is the name for a family of straight-four 16-valve full-aluminium automobile engines with variable valve timing co-developed by Renault and Nissan. Renault calls it the M engine. Other noteworthy features of this engine family include acoustically equal runner lengths and a tumble control valve for the intake manifold, a "silent" timing chain, mirror finished crankshaft and camshaft journals, and offset cylinder placement in an attempt for increased efficiency.
Nissan Variable Timing control or Nissan Valve Timing Control System is an automobile variable valve timing technology developed by Nissan. N-VTC was first introduced in 1987 on the VG30DE and VG20DET engine.
Variable valve lift (VVL) is an automotive piston engine technology which varies the height a valve opens in order to improve performance, fuel economy or emissions. There are two main types of VVL: discrete, which employs fixed valve lift amounts, and continuous, which is able to vary the amount of lift. Continuous valve lift systems typically allow for the elimination of the throttle valve.
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