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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 1ZR-FAE is a DOHC, 16-valve, 1.6 L (1,598 cc) engine also equipped with Dual VVT-i and Valvematic. Output for this engine is rated at 132 hp (98 kW) at 6400 rpm and 118 lb⋅ft (160 N⋅m) of torque at 4400 rpm for most applications. Compression ratio has been increased to 10.7:1, red line is at 6600 rpm.
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.
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
Alfa Romeo was the first manufacturer to use a variable valve timing system in production cars (US Patent 4,231,330). The 1980 Alfa Romeo Spider 2.0 L had a mechanical VVT system in SPICA fuel injected cars sold in the US. Later this was also used in the 1983 Alfetta 2.0 Quadrifoglio Oro models as well as other cars.
The VTi Engine (Variable Valve Lift and Timing injection) is a variable valve timing (VVT) system for Prince engine created jointly by both PSA (Peugeot, Citroën, DS Automobiles) and Mini from the BMW Group.
With traditional fixed valve timing, an engine will have a period of "valve overlap" at the end of the exhaust stroke, when both the intake and exhaust valves are open. The intake valve is opened before the exhaust gases have completely left the cylinder, and their considerable velocity assists in drawing in the fresh charge. Engine designers ...
The variable valve timing (VANOS) is a continuously variable design and is present on both the intake and exhaust camshafts. The VANOS units were designed as integral components of the chain drive, and the adjustment ranges are 63 degrees for the intake camshaft and 60 degrees for the exhaust camshaft. [4]
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