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About Bentley Mulsanne Engine
The new Bentley Mulsanne is a high-end luxury car produced by Bentley Motors Limited in the United Kingdom.
Despite the gumption, it’s not a diesel. The Mulsanne generates all that thrust barely off-idle from a gasoline-powered 6.75-liter twin-turbo V8. 505 horsepower, too. The engine is all new, made from aluminum and lightweight internals including a forged crankshaft. It also features cam-phasing (variable valve timing) and variable displacement (cylinder deactivation). One benefit of all that tech is that the staggering torque number is available across the rev range, another is better fuel economy, as if that really matters to Bentley prospects.
Re-engineered V8 engine and new chassis: power, refinement and efficiency
The Bentley powertrain engineers were set three objectives for the Mulsanne:
1) To produce the effortless torque from extremely low revs that customers expect of a grand Bentley
2) To maintain the highest levels of refinement
3) To satisfy strict current and future environmental standards through improved engine efficiency
Under the bonnet is a heavily updated version of the Arnage’s L-series 6.75 litre V8, which can trace its origins back to the firm’s first V8 from 1959. The engine also has improved torque delivery, with much more available lower down the rev range.
Bentley’s engineers have made many changes to the engine to make it suitable for the car and to pass modern emissions legislation.
While other powertrain configurations were considered early on in the project, it soon became clear that these targets could best be achieved with a totally revised version of the 6¾-litre V8 engine – the very configuration that had been used so successfully in the past. However for the new Mulsanne, all the major building blocks of the engine would be comprehensively re-engineered to integrate the very latest technologies.
Lighter, more efficient components such as the water pump and many new internal components (inlcuding cam phasing and variable displacement) help to cut the engine’s mass and improve fuel consumption by 15 per cent.
The new result is a remarkable 6.75 litre, 90-degree V8 engine, an all new 505bhp engineering marvel that generates 1020Nm of torque is now delivered even earlier at 1800 rev/min. . All the major building blocks of the engine are new and have been designed to optimise performance. They also contribute towards meeting three key objectives: maximising torque, refinement and efficiency. Nowhere is this better demonstrated than in the introduction of two new electro-mechanical control systems: cam phasing and variable displacement. The pioneering use of these two technologies in combination allows the Mulsanne’s engine management system not only to actively adjust the V8’s breathing, but to effectively throttle back four of the cylinders entirely, independently of the others, when not required.
This ability to finely control the engine’s fuel-air intake and timing allows for the maximum availability of huge amounts of torque. At the same time, it ensures that the engine operates in as economical and refined a manner as possible when more relaxed motoring is the order of the day. Variable displacement also has a significant effect on the new engine’s fuel consumption thanks to its ability to idle four of the eight cylinders when cruising. This, in conjunction with the new eight-speed automatic transmission with quick-shift, reduces CO2 emissions and offers a potential 15 per cent saving in fuel compared to the previous V8.
To achieve a significant reduction in fuel consumption and CO2. emissions, the Mulsanne V8 sees the introduction of two new control systems: cam phasing and, a first for the ultra-luxury sector, variable displacement. The pioneering use of these two technologies in combination allows the Mulsanne’s engine management system not only to adjust the V8’s breathing for improved engine idle quality and torque delivery, but also to close the valves of four of the eight cylinders for maximum fuel economy when cruising.
New lightweight componentry including pistons, connecting rods and forged crankshaft reduce reciprocating mass and internal friction for improved engine response.
This dramatic improvement in torque delivery from just above idle and right across the rev range ensures that with a mere tap of the accelerator the driver is immediately rewarded with that characteristic deep, muffled V8 burble and phenomenal acceleration.
Engine Specification
Type: Twin-turbocharged V8
Installation: Front, longitudinal, rear-wheel drive
Construction: Alloy heads and block
Capacity: 6750cc
Power: 512PS / 505bhp / 377kW
Torque: 1020Nm / 752 lb ft
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