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Tomorrow’s world: Fiat's MultiAir engine tech

By Jesse Crosse Motor Industry 14 October 2009 16:50 Fiat this year launches what it claims is a big step forward in variable valve timing: MultiAir. It's the first time that a manufacturer has made a properly variable valve system a production reality, and will slowly be rolled out across most of Fiat's and Alfa's car ranges.How does Fiat's MultiAir vary from existing variable valve timing (VVT) systems?Current VVT systems rely on mechanical systems to open and close the valves. Engineers have long understood the benefits of changing valve opening and closing times to tweak an engine's power and emissions performance, depending on the need for power or parsimony.Valves are an engine's nose and mouth – it inhales through inlet valves and exhales through exhaust valves.

New Images: Mercedes Unimog concept

Mercedes-Benz's Special Trucks unit (MBS) recently revealed a design study celebrating the 60th anniversary of the Unimog at the Daimler plant in Wörth, Germany. Called simply '60 Years Unimog', the concept is said to inform the future form language of Mercedes-Benz commercial vehicle design. Developed jointly by the MBS development team, the Daimler commercial vehicle designers in Sindelfingen and a model designing partner, the Unimog concept was inspired by the poison dart frog, a natie of Central and South America.

Dodge revives the 392 Hemi in the 2011 Challenger SRT8

The 2011 Dodge Challenger SRT8 392 marks the return of the 392-cubic-inch Hemi V8. The 392-cubic-inch Hemi (6.4 liters), which has not been in a production car for 52 years, produces 470 hp and 470 lb-ft of torque. That is up 45 hp and 50 lb-ft over the previous 6.1-liter Hemi V8 in the Challenger SRT8.