Fiat’s two-cylinder, 875cc petrol TwinAir engine was awarded the top title after its launch at the end of last year.
Judges at the awards, recognised as the biggest and most respected engine titles in the world, were impressed by the use of two-cylinder technology and the road tax-free CO2 emissions of under 100g/km – the only petrol car in the UK to qualify for the lowest VED band.
Dean Slavnich, editor of Engine Technology International and co-chairman of the International Engine of the Year Awards, says: "Fiat has now produced one of the all-time great engines. Who would have thought that a two-cylinder unit could have won the International Engine of the Year title when we launched the Awards in 1999?
"Its triumph is a clear signal that less is more: people want low-emission, fuel-efficient yet powerful engines, and just two cylinders certainly seems to provide a comprehensive solution!"
The Fiat 500 TwinAir was launched in the UK late in 2011 and after initial success, Fiat took the decision to launch an entire range using the TwinAir name.
The Fiat 500 TwinAir range features unique body colours and TwinAir badging to identify the efficient technology used in the award-winning engine.
Fiat’s TwinAir engine took four titles in all including Best New Engine, Best Sub-1.0-litre and Best Green Engine – finishing ahead of the likes of the Nissan Leaf electric car in the process.
Dario Sacco, Engines Platform Vice President at Fiat, said: "Today’s success is the crowning moment of all our hard work in researching innovative technological solutions and designing increasingly efficient engines."
The Fiat 500 TwinAir range is available from under £11,000 in entry-level specification from all Fiat dealerships in the UK.