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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.
Early variable valve timing systems used discrete (stepped) adjustment. For example, one timing would be used below 3500 rpm and another used above 3500 rpm. More advanced variable valve timing systems offer continuous (infinite) adjustment of the valve timing. Therefore, the timing can be optimized to suit all engine speeds and conditions. [2] [3]
The Toyota 4ZR-FE is a 1.6 L (1,598 cc) DOHC, 16-valve engine with Dual VVT-i. Output for this engine is rated at 117 hp (87 kW; 119 PS) at 6000 rpm and 150 N⋅m (111 lb⋅ft) of torque at 4400 rpm. It is an analogue of the 1ZR-FE for use in China only. Applications. Toyota Corolla EX (ZRE120) (China only) Toyota Yaris (ZSP91) (China only)
For twin-cam or DOHC engines, VCT was used on either the intake or exhaust camshaft. (Engines that have VCT on both camshafts are now designated as Ti-VCT.↓) The use of variable camshaft timing on the exhaust camshaft is for improved emissions, and vehicles with VCT on the exhaust camshaft do not require exhaust gas recirculation (EGR) as retarding the exhaust cam timing achieves the same ...
It features DOHC, 16 valves and VVT-i. Bore and stroke is 86 mm × 86 mm (3.39 in × 3.39 in). Its power is 100 kW (134 hp; 136 PS) at 5,600 rpm, and 18.6 kg⋅m (182 N⋅m; 135 lbf⋅ft) of torque at 4,000 rpm with redline of 6000 rpm. Just like its sister, the 2TR-FE engine, the 1TR-FE engine also received a Dual VVT-i update. The updated ...
Implements variable valve timing system VVT-iE and engine operation by Miller / Atkinson cycle. [9] Main differences between 2NR-FE : Max. Output: 109 PS (80 kW; 108 bhp) at 6000 rpm; Max. Torque: 136 N⋅m (100 lb⋅ft) at 4400 rpm; Compression ratio: 13.5:1; Applications: Toyota Corolla Axio (April 2015 – present) [10]
1NZ-FE engine Updated Japanese market 1NZ-FE engine with different plastic engine cover. The 1NZ-FE is a 1.5 L (1,497 cc) conventional Otto-cycle variant of the 1NZ-FXE with VVT-i on the intake camshaft. The engine block is found in many Toyota models assembled in Japan and Asian countries.
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.
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