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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 Toyota 2ZR-FE is a DOHC, 16-valve, 1.8 L (1,798 cc) [3] engine also equipped with Dual VVT-i. This new engine replaced the 1ZZ-FE engine in most applications. [ 4 ] Output for this engine is rated at 98–103 kW (132–138 hp) at 6000 rpm and 173 N⋅m (127.5 lb⋅ft) of torque at 4400 rpm for the Corolla, Matrix, and Vibe and 95 kW (128 hp ...
The engine series shares many of the technologies in the AZ engine, while incorporating features such as variable valve timing on both intake and exhaust camshafts or dual VVT-i, low friction technologies including an offset crankshaft, roller rockers for the valvetrain, a three-stage variable oil pump, reduced-tension piston rings and ...
1,986 cc 3ZR-FAE DOHC 16-valve EFI straight-four with Dual VVT-i and Valvematic: Super CVT-i with 7-speed simulation 111 kW (149 hp; 151 PS) at 6,100 rpm 193 N⋅m (142 lb⋅ft) at 3,800 rpm 2013–2020 ASU60 (FWD) ASU65 (4WD) 1,998 cc 8AR-FTS DOHC 16-valve EFI turbocharged straight-four with VVT-iW and D-4ST 6-speed U661 automatic
Variable valve timing (VVT) is the process of altering the timing of a valve lift event in an internal combustion engine, and is often used to improve performance, fuel economy or emissions. It is increasingly being used in combination with variable valve lift systems.
Valvematic offers a broader range of continuously variable valve timing (lift and phasing) over VVT-i, providing more optimal intake valve (not on exhaust side) operation relative to engine demands conferring a five-percent improvement in fuel economy and engine output. [3] [44] The Eco model's engine also has an increased compression ratio of ...
The valve mechanism is equipped with 4-Valves per cylinder, DOHC, and implemented Toyota's Dual VVT-i and VVT-iW. It also uses multi-point or direct fuel injection . The 1NR, 2NR, 3NR, 4NR, 5NR, 6NR, and 7NR engines have Dual VVT-i standard and the 8NR engine has VVT-iW , enabling it to operate in the Otto cycle as well as a modified- Atkinson ...
It has four valves per cylinder and DOHC. Valve adjustment is by shim over bucket. The 2RZ-FE is an interference engine with a timing chain. [2] [3] A 2.2 L (2,185 cc) version called the 4RB3 is also manufactured in China which has a bore and stroke of 91 mm × 84 mm (3.58 in × 3.31 in), while sharing the 2RZ's 102.5 mm (4.04 in) bore spacing.