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MultiAir or Multiair is a hydraulically-actuated variable valve timing (VVT) and variable valve lift (VVL) engine technology enabling "cylinder by cylinder, stroke by stroke" [1] control of intake air directly via a gasoline engine's inlet valves. Developed by Fiat Powertrain Technologies, the technology addresses a primary engine inefficiency ...
Fiat was the first auto manufacturer to patent a functional automotive variable valve timing system which included variable lift. Developed by Giovanni Torazza in the late 1960s, the system used hydraulic pressure to vary the fulcrum of the cam followers (US Patent 3,641,988). [ 1 ]
Fiat was the first auto manufacturer to patent a functional automotive variable valve timing system which included variable lift. Developed by Giovanni Torazza in the late 1960s, the system used hydraulic pressure to vary the fulcrum of the cam followers (US Patent 3,641,988). [ 9 ]
Fiat's TwinAir debuted at Internationale Automobil-Ausstellung 2007 in the Fiat Panda Aria concept car. [ 3 ] as an 80 PS (59 kW), turbocharged, CNG-hydrogen mix and gasoline bifuel unit. The production TwinAir engine was launched at the 2010 Geneva Motor Show in 85 PS (63 kW), turbocharged gasoline form and became available later in 2010 in ...
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.
In January 2011, VM Motori launched its brand new engine 3.0L V6 Variable Valve Timing A 630 DOHC With 241 hp (180 kW; 244 PS) and 550 N⋅m (410 lb⋅ft) of torque. Thanks to a collaboration with Fiat Powertrain Technologies, the engine features the latest FPT Common Rail Multijet2 technology for improved performance, fuel economy and NVH. In ...
The system has the advantage that it is continuously variable rather than switching in at a set speed. Its disadvantage is the complexity of the system and corresponding price. Other systems will achieve similar results with less cost and simpler design (electronic control). For a more detailed description, see the sandsmuseum link below.
The system, developed by Fiat Powertrain Technologies, is an hydraulically-actuated variable valve timing (VVT) technology enabling "cylinder by cylinder, stroke by stroke" control of intake air directly via a gasoline engine's inlet valves. [5] In February 2019, Jaguar Land Rover announced their long-rumoured inline-6 engine.
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