Toyota Corolla — What’s the difference between the VVT-i T2 and the…

1 Июн 2015 | Author: | No comments yet »
Toyota Corolla Compact IV

Toyota Corolla — the difference between the VVT-i T2 and the T3?

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VVT-i, or Valve Timing with is an automobile variable valve technology developed by Toyota, in performance to the BMW#039;s VANOS. The VVT-i system replaces the VVT offered starting in 1991 on the per cylinder 4A-GE engine. The VVT is a 2-stage hydraulically controlled cam system.

VVT-i, introduced in varies the timing of the intake by adjusting the relationship between the drive (belt, scissor-gear or and intake camshaft. Engine oil is applied to an actuator to adjust the position.


In 1998, Toyota offering a new technology, VVTL-i, can alter valve lift duration) as well as valve In the case of the 16 valve 2ZZ-GE, the has 2 camshafts, one operating intake and one operating exhaust valves. camshaft has two lobes per cylinder, one low rpm and one high rpm, high long duration lobe. cylinder has two intake valves and two valves. Each set of two valves are by one rocker arm, which is by the camshaft. Each rocker arm has a follower mounted to the rocker arm a spring, allowing the slipper to move up and down with the lobe without affecting the arm. When the engine is below 6000-7000 rpm (dependent on car, and ECU installed), the low lobe is the rocker arm and thus the valves. the engine is operating above the engagement point, the ECU activates an oil switch which pushes a pin under the slipper follower

on each rocker arm. in effect, switches to the high causing high lift and duration.

Toyota has now ceased production of its engines for most markets, the engine does not meet IV specifications for emissions. As a result, engine has been discontinued on Toyota models, including of the Corolla T-Sport (Europe), Sportivo (Australia), Celica, XRS, Toyota Matrix and the Pontiac Vibe GT, all of which had the engine fitted.

The Lotus continues to offer the 2ZZ-GE and the engine, while the Exige the engine with a supercharger.

Dual VVT-i

In 1998, VVT-i which adjusts on both intake and exhaust was first introduced on the RS200 3S-GE engine.

Dual is also found in Toyota#039;s new V6 engine, the 3.5-liter 2GR-FE appearing on the 2005 Avalon. engine can now be found on numerous and Lexus models. By adjusting the timing engine start and occurs virtually unnoticeably at compression. In addition fast of the catalytic converter to its light-off is possible thereby reducing emissions considerably.

Toyota#039;s UR engine V8 also use technology. Dual VVT-i was introduced to Toyota#039;s latest 4-cylinder ZR engines found in vehicles such as the new Toyota and Scion XD and in larger 4-cylinder AR found in the Camry and RAV4.

uses an electric motor of hydraulic system to control valve timing offering precision at lower rpms and


Toyota first details about its latest technology in June 2007.[2] made its first appearance in in the Noah[3] and later in early-2009 in the ZR family used on the Avensis. system is simpler in design to Valvetronic and VVEL, allowing the head to remain at the same

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