TwinAir (MultiAir)

Automaker Fiat introduced the revolutionary TwinAir engine debuting in the new Fiat 500 This engine works with an active regulation of air sucked into the cylinder. The development of new engine worked motorářská division of Fiat, Fiat Powertrain Technologies (FPT). The development of this revolutionary engine lasted twenty years.

The newly developed gasoline engine is equipped with electro-hydraulic system that can open independently of the intake valve camshaft position and above all independently from the other cylinders. This increases the efficiency of performance MultiAir air cylinders. The new system actually substitutes the function of the variable valve timing , but has lower losses and thus a much lower energy intensity. For example, there is no system MultiAir roughly ten percent loss arising from the passage of the air intake throttle.

head of a new engine technology MultiAir

Automaker Fiat from the new technology promises to increase performance, reduce fuel consumption and reduce emissions . The first car with the engine MultiAir Alfa Romeo MiTo GTA. His performance, drawn from a modest volume of 1.75 liters, the 240 horses. Fiat says that thanks to the MultiAir can increase peak power by 10%, while decreasing the speed required to achieve maximum torque by 15%. At the same time the new engine has 10% lower fuel consumption. Depending on the operating conditions are 10% to 25% better and exhaust emissions .

Principle:

Developers of the Italian Fiat eliminate direct mechanical link between the intake valves and camshafts. This member of the binding replace elektrohydaulickým able to open the suction valve to a large extent independently of how the position of the cam shaft and the other cylinders. Valve is simply extruded a short high-pressure line. Ability of independent opening valve significantly improves engine performance and more accurate. The mechanical design of the engine is easier because there is no need for the second cam and complex variable timing mechanism , which have engines with VVT systems.

The main benefit is the ability of the system earlier intake valve closure, thus preventing the already aspirated air to the intake manifold. Timely conclusion of the combustion chamber to increase the amount of air in the cylinder and significantly increasing efficiency. MultiAir system is applicable to gasoline and diesel engines, turbo-charged and filled with atmospheric, while the turbo significantly increases its efficiency.

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