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Fiat boosts engine output with new MultiAir technology


Fiat claims MultiAir can boost peak power by 10% while also reducing fuel consumption by the same amount

Fiat claims MultiAir can boost peak power by 10% while also reducing fuel consumption by the same amount

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Already a leader in advanced diesel engine technology, Fiat has added to its arsenal a new advancement for petrol engines the company claims will significantly boost power and torque, while cutting emissions. The new technology has been labeled it MultiAir and it will be debuting in the high-performance Alfa Romeo MiTo GTA at the end of the year.

The key to controlling petrol engine combustion, and therefore performance, emissions and fuel consumption, is the quantity and characteristics of the fresh air charge in the cylinders. In conventional petrol engines the air mass trapped in the cylinders is controlled by keeping the intake valve opening constant and adjusting upstream pressure through a throttle valve and camshafts.

One of the drawbacks of this simple conventional mechanical control is that the engine wastes about 10% of the input energy in pumping the air charge from a lower intake pressure to the atmospheric exhaust pressure.

MultiAir is unique in that it uses an electro-hydraulic system to actuate the valves as opposed to the more common electro-mechanical setup. This relatively simple system can alter the timing of the valve's opening and closing in relation to how much power or efficiency is required at any specific moment. Additionally, it draws very little power from the engine.

Fiat claims MultiAir can boost peak power by 10%, lower the RPM levels for peak torque by 15%, reduce fuel consumption by 10% and reduce carbon dioxide emissions by between 10 and 25%.

MultiAir’s first application will be the 1.75L four-cylinder unit from the upcoming MiTo GTA, which will feature a specific horsepower rating of 240hp (179kW). To achieve such a high output from the low-displacement mill, Fiat employs both conventional turbocharging technology as well as the new MultiAir element. Further down the track Fiat will use the technology to boost the performance of a new range of two-cylinder engines.
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Comments (4)
  1. if this comes to america... all bets are off for the fiesta. just putting it out there.
     
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  2. Great engine for the Chrysler Fiat based products
     
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  3. The United States welcomes this technology and Chrysler can get it introduced here! If the US Automotive Industry is going to bounce back this needs to happen. Lets face it'll take advantages like this and their diesel technology to compete with Japanese and Korean manufacturers! Who would have thought Italian and US Autos team up to lead the world!
     
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  4. Complex control systems using valves requires an automatic control based input of an actuator. The actuator strokes the valve allowing the valve to be positioned accurately and allowing control over a variety of requirements.
     
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