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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.
Cutaway view of Variable Valve Timing with intelligence on a ZR engine in Techniquest Glyndŵr. VVT-i, or Variable Valve Timing with intelligence, is an automobile variable valve timing petrol engine technology manufactured by Toyota Group and used by brands Groupe PSA (Peugeot and Citroen), Toyota, Lexus, Scion, Daihatsu, Subaru, Aston Martin, Pontiac and Lotus Cars.
The 1GZ-FE is a 4,996 cc (5.0 L) 48-valve DOHC V12 engine with variable valve timing ().Bore is 81 mm and stroke is 80.8 mm, with a compression ratio of 10.5:1. The official power output advertised in Japan per the gentlemen's agreement is 206 kW (276 hp; 280 PS) at 5,200 rpm, though it was advertised as 220 kW (295 hp; 299 PS) in export markets.
Toyota commissioned Yamaha to design the 2ZZ-GE, based on Toyota's ZZ block, for high-RPM operation and producing a power peak near the top of the RPM range. The high-pressure die-cast aluminum alloy engine block of the 2ZZ-GE featured cylinder walls with Metal Matrix Composite (MMC) , which is a reinforcement material composed of ceramic parts ...
The 3UR-FE is a 5.7-litre (5,663 cc) engine designed for use in the Toyota Tundra, Sequoia, Land Cruiser, and Lexus LX570 vehicles, without the D-4S gasoline direct injection but with Dual VVT-i. Bore and stroke is 94 mm × 102 mm (3.70 in × 4.02 in), it produces 381 hp (284 kW; 386 PS) @ 5,600 rpm and 55.4 kg⋅m (401 lb⋅ft; 543 N⋅m) of ...
Nissan SR20VE 2.0-liter straight-4-cylinder head with DOHC, Nissan's Neo VVL variable valve timing with lift control and four valves per cylinder. Multi-valve train of Volvo's 2005 truck diesel engine D13A, a 12.8-liter turbocharged straight-6 (21.1-28.1 kW/liter) with SOHC and four valves per cylinder located around a central injector, and VEB ...