Engine of Bugatti Veyron

The Veyron features an 8.0-litre (1.8 imp gal; 2.1 US gal) W16 engine — sixteen cylinders in two banks of eight cylinders, or the equivalent of two narrow angle V8 engines mated in a "W" configuration. Each cylinder has four valves for a total of sixty four, but the narrow staggered eight configurations allows two overhead camshafts to drive two banks of cylinders so only four camshafts are needed. The engine is fed by four turbochargers and displaces 7,993 cubic centimetres (487.8 cu in), with a square 86 mm by 86 mm (3.4 in × 3.4 in) bore and stroke.
The transmission is a dual clutch Direct-Shift Gearbox computer-controlled automatic with seven gear ratios, with magnesium paddles behind the steering wheel and a shift time of less than 150 milliseconds.
According to Volkswagen Group, the DIN rated[citation needed] motive power output, approved by TÜV Süddeutschland, of the final production Veyron engine produces 1,001 metric horsepower (736 kW; 987 bhp) and generates 1,250 newton metres (922 ft•lbf) of torque. The figure has been confirmed by Bugatti officials to actually be conservative, with the real total being 1020 bhp or more.
The top speed was verified by James May on Top Gear for the November 2006 issue, again at Volkswagen Group's private Ehra-Lessien test track, where the final-production car hit 407.9 km/h (253.5 mph), which equated to almost one-third of the speed of sound at sea level.

http://wapedia.mobi/en/Bugatti_Veyron
Picture from:http://www.seriouswheels.com/abc/Bugatti-EB-16-4-Veyron-Study-Engine-1280x960.htm