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by Matt Brogan

Chrysler will debut Fiat’s 1.4-litre, in-line four-cylinder Fully Integrated Robitised Engine (FIRE) featuring MultiAir in the Fiat 500 from next year.

The engine develops 75kW @ 5,750rpm and 129Nm of torque at 4,250rpm making it ideal for small car applications. The 1.4-litre FIRE features Fiat’s Multiair technology, which significantly reduces emissions while improving fuel economy and power delivery.

Featuring four valves per cylinder and incorporating state-of-the-art technology for Fully Variable Valve Actuation (FVVA), also known as MultiAir, the engine delivers an increase in power of up to 10 per cent while also reducing fuel consumption and emissions by the same amount.

A turbocharged version of the engine is also planned and will produce a fuel economy improvement of up to 25 per cent when compared to a V6 engine with equivalent power.

The MultiAir system consists of electro-hydraulic variable valve actuators filled with conventional oil, which is interposed between the camshaft and each valve. A solenoid valve is energized every 360-degree camshaft rotation, regulating the quantity of oil addressed to the actuator or to a reservoir. The lift of the valve is a function of the quantity of oil addressed to the actuator, ranging from full lift to complete valve closure. Each solenoid valve may also delay application of the actuator in advance, leading to late valve opening or early valve closing.

MultiAir is exclusive for Chrysler Group in North America and is based on a series of Fiat Powertrain patents related to hardware, combustion strategies and controls that allow for full control of the lift and timing of engine valves.

In the early 1970s, robotics in assembly plants was not common. The term “FIRE” came into existence when Fiat integrated the use of robotics in the production process of manufacturing plants. Although mechanised assembly is commonplace today, the brand name FIRE has remained with Fiat’s powertrain lineup

The 1.4-litre FIRE with MultiAir is the world’s first mass production engine to incorporate such technology to control the intake valves. Dedicated components have been developed to accommodate four “bricks” (one for each cylinder), which package relevant components. MultiAir technology can be adapted to different types of engines, including Diesels for enhanced NOx control, and is planned for Chrysler Powertrain’s four-cylinder World Gas Engine and all-new Pentastar V6.




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