Engineer or artist? Mario Illien is both.  The Swiss engine designer powered McLaren to glory in the 1990s, and helped make F1’s current hybrid engines the most efficient in the world. Working in isolation for up to 18 hours a day, Mario has spent decades using exotic materials to make light, efficient and powerful engines for F1 and IndyCar legends. He tells Tom Clarkson the secrets of a great F1 power unit, which drivers were able to get the most out of an engine, and how he and his company Ilmor powered teams to Indy 500 victories and F1 World Championships. Plus, tales of 1000 horsepower engines, top secret projects and racing from Paris to Beijing.

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