Bugatti Special Features

Special Features

The special features of the Bugatti W-16 engine are amazing. For example:

The engine has four valves per cylinder, for a total of 64 valves.
It has a dry sump lubrication system borrowed from Formula 1 race cars, along with an intricate internal oil path to ensure proper lubrication and cooling within the 16 cylinders.
It has electronically controlled, continuously variable cam timing to create optimal performance at different engine rpm settings.
It has a massive radiator to deal with all of the waste heat that burning 1.33 gallons of gasoline per minute can generate.

Everything about the engine is superlative.

And it is remarkably compact. It measures just 710 mm (27 inches) long, 889 mm (35 inches) wide and 730 mm (28.7 inches) high. This is the beauty of Bugatti's W-16 approach -- the engineers managed to fit 1,000 hp into a reasonably sized package.

In order to harness all of this horsepower and torque, you need an amazing transmission...

The Transmission

The transmission is unique, in particular because it has to harness about twice as much torque as any previous sports-car transmission. It has:

Seven gears
A dual clutch system
Sequential shifting
A paddle-driven, computer-controlled shifting system

This computer-controlled system is identical to the sort of system found in a Formula 1 car or a Champ car. There is no clutch pedal or shift lever for the driver to operate -- the computer controls the clutch disks as well as the actual shifting. The computer is able to shift gears in 0.2 seconds.

See Audi: Uninterrupted Power: Technical Details for more information on dual-clutch systems.

It would be almost impossible for all of the torque available from the W-16 engine to flow out to just two wheels without constant wheel-spin. Therefore, the Veyron has full-time all-wheel drive. By applying the engine's power to all four wheels through a computer-controlled traction-control system, the car is able to harness all of the engine's horsepower, even at full acceleration.

See Audi: Quattro for an explanation of the Quattro all-wheel drive system. See also How Differentials Work and How Four-Wheel Drive Works.

How much gas is that?

1,000 horsepower is equivalent to roughly 2.6 billion joules per hour. A gallon (3.8 liters) of gasoline contains 132 million joules, so a 1,000-hp engine has to be able to burn just over 20 gallons of gasoline per hour.
However, car engines are only about one-quarter efficient -- three quarters of the gasoline's energy escapes as heat rather than as power to the wheels. So the engine actually has to be able to burn at least 80 gallons per hour, or 1.33 gallons (5 liters) per minute.
Let's convert over to metric. Gasoline requires about 14.7 kilograms of air to burn 1 kilogram of gas. Air weighs 1.222 kilograms per cubic meter at sea level. A gallon of gasoline weighs 2.84 kilograms. So the engine has to be able to process 2.84*1.33*14.7 kilograms of air per minute, or roughly 45 cubic meters of air per minute. That's 45,000 liters of air per minute.
If a V-8 engine is turning at 6,000 rpm, it can inhale a total of 24,000 cylinders' full of air per minute. If it needs to inhale 45,000 liters of air per minute, it works out to roughly 2 liters per cylinder-full. That's a 16-liter engine.