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Bugatti looks back at how how it developed the W16 engine

As the end of the Chiron's production run nears, Bugatti is taking a look back at the W16 engine that has powered its cars since it returned to the scene nearly 20 years ago. The engine is relatively compact, hugely powerful, and it has helped the firm set several world records. Former Volkswagen boss Ferdinand Karl Piech knew that successfully reviving Bugatti required building a car that stood out from everything else on the road at the time. He initially planned to power the then-upcoming Veyron with an 18-cylinder engine and sketched it out on an envelope while riding on a high-speed train from Tokyo to Osaka in Japan in 1997. His concept later became a 16-cylinder engine, but dropping a pair of cylinders didn't make the unit easier to develop. Bugatti engineers started from scratch in order to make the W16 a reality. "We had to engage in basic development for every component; every vehicle part had to be constructed anew and tested — even the engine test bench. The only thing we didn't change was the pencils we used for drawing," said former Bugatti head of technical development Gregor Gries. The initial goal was to launch the Veyron with over 1,000 horsepower, and even some insiders doubted that this could be achieved. Bugatti pulled it off: The Veyron entered production in 2005 with a quad-turbocharged, 8.0-liter W16 engine rated at 1,000 horsepower and 922 pound-feet of torque. Horsepower increased to 1,200 in the Veyron Super Sport, and the Chiron inaugurated a new version of the engine rated at 1,500 horsepower thanks in part to bigger turbos, though the Chiron Super Sport offers a 1,600-horsepower output. Engineers faced several significant challenges during the Veyron's development process. Getting the W16 to make 1,000 horsepower wasn't one; it broke the symbolic barrier the first time it was put on a test bench in 2001. Keeping its temperature in check required designing a massive cooling system that takes over 10 gallons of coolant and installing a titanium exhaust system. With the engine ready to go, Bugatti turned its attention to creating a car capable of coping with 1,000 horsepower, both in terms of comfort and in terms of aerodynamics. "Back then, there was no literature or empirical data for production engines with more than 12 cylinders or for production vehicles that could go faster than 217 mph," said Karl-Heinz Neumann, Volkswagen's former head of engine development.

Bugatti Bolide's Le Mans-ready underpinnings highlighted

The limited-edition, track-only Bugatti Bolide uses the familiar 8.0-liter W16 engine, but writing it off as merely a rebodied Chiron would be a cruel understatement. The French company is highlighting the new monocoque it developed for the model to show some of the differences. While nothing suggests that Bugatti will enter the Bolide in the 24 Hours of Le Mans, the model's carbon fiber monocoque is capable of withstanding such an arduous race because it was designed to the meet the same requirements that apply to LMDh cars. Starting with a blank slate allowed engineers to move the quad-turbocharged engine forward by about 2.4 inches to better integrate it into the monocoque.  Bugatti then turned its attention to what it calls one of the most difficult requirements to meet: rollover protection. LMDh regulations require a car to withstand a 7.5-metric-ton load on each A-pillar without bending more than approximately two inches. Additionally, the car fails this test if the A-pillar breaks within about four inches of the impact point. The upcoming Bolide passed this test as well as two other roll-over tests. There's more to safety than the ability to withstand one hell of an impact. Bugatti installed an automatic, military-grade fire extinguisher system and integrated the outer section of the headrests into the doors to facilitate the task of getting in and out of the cockpit. It also added six-point harnesses for the two passengers but it didn't forget about comfort: a high-performance climate control system comes standard. Running the air conditioning at full blast shouldn't have a noticeable effect on performance, as power comes from an 8.0-liter W16 engine that's quad-turbocharged to develop 1,578 horsepower. The Bolide weighs under 3,200 pounds and develops 6,600 pounds of downforce.  Bugatti will continue testing the Bolide in the coming months, and deliveries are scheduled to start in 2024. Production is limited to 40 units, and pricing starts at approximately ˆ4 million (about $4.29 million at the current conversion rate). Every example is already spoken for. Related video: Featured Gallery Bugatti Bolide monocoque Bugatti Coupe Racing Vehicles Performance

Limited-edition Bugatti Chiron Sport bridges the gap between cars and planes

Bugatti is highlighting the little-known link between some of its earliest race cars and aviation with a limited-edition variant of the Chiron Sport named Les Legendes du Ciel. Although it doesn't gain wings and an air-cooled radial engine, the model features several design tweaks made to catch the eye of vintage car and airplane buffs alike. "Many successful Bugatti racing drivers, such as Albert Divo, Robert Benoist and Bartolomeo ‘MeoÂ’ Costantini, flew for the French Air Force. It is therefore almost an obligation for us today to pay tribute to the legends of that time and dedicate a special edition to them," explained company boss Stephan Winkelmann in a statement.  Starting with a Chiron Sport, stylists painted the body in a specific shade called Gris Serpent (which means "snake gray" in French) that's inspired by the color of some of the planes that flew during the 1920s. For contrast, they added a white stripe that stretches from the grille to the rear wing, and they painted the front part of each rocket panel blue, white and red. Exposed carbon fiber accents add a finishing touch to the overall design. Look closely at the front end, and you'll notice another edition-specific touch. Instead of mesh, the grille's insert is made with laser-cut strips of aluminum arranged to look like a group of planes flying in a formation.  Brown leather upholstery dominates the cabin, and aluminum trim pieces create another visual link between the Les Legendes du Ciel and planes built over a century ago. Each door panel gains a hand-sketched image showing a Bugatti Type 13 racing against a Nieuport 17 biplane. Released in 1910, the Type 13 was the first car to wear the Bugatti name. Launched in 1916, the 17 was a single-seater appreciated for its speed and reliability. Power for the Les Legendes du Ciel comes from a quad-turbocharged 8.0-liter W16 engine, which produces 1,500 horsepower and 1,180 pound-feet of torque. It spins the four wheels via a seven-speed dual-clutch automatic transmission linked to steering wheel-mounted shift paddles, and it sends the Chiron to a top speed that's electronically limited to 261 mph. In other words, it's faster than some of the planes it pays tribute to. Bugatti will make 20 units of the Chiron Sport Les Legendes du Ciel, and pricing starts at 2.88 million euros, a figure that represents $3.41 million at the current conversion rate. It sounds like build slots are still available.