Bentley talks about Bentley Flying Spur engineJanuary 18, 2021
The 4.0-liter twin-turbo V8 engine delivers more than 137 hp per liter of displacement. The Flying Spur V8 has a range of over 709 km, CO2 emissions of 288 g / km, and acceleration to 100 km / h in 4.1 seconds.
The new Flying Spur continues Bentley’s more than 60-year tradition of V8 engines. The version features a distinctive deep engine sound, extended range and reduced CO2 emissions while maintaining outstanding dynamic performance. Such an exceptional and impressive combination was achieved thanks to the use of the latest engineering solutions and technologies.
The Bentley’s 4.0-liter V8 engine features a high-strength aluminum die-cast engine block, twin turbochargers, and camber primary catalytic converters. The fuel injectors and spark plugs are centrally located in the combustion chambers. This solution optimizes fuel atomization and combustion. The camshafts can vary valve timing up to 50 ° and disable half of the cylinders when the engine is running at part load, making it a perfectly balanced V-four.
An optimized design concept enables the V8 engine to deliver high torque and power output, while also delivering reduced emissions and maximum efficiency.
A five-bearing crankshaft and lightweight pistons ensure efficient operation of the compact V-engine. To reduce frictional power losses, the cooling system pump and timing chains are driven directly from the crankshaft using an intermediate shaft. In this engine, the piston stroke is equal to the cylinder bore (86 mm), which guarantees the perfect balance of power and torque. Twin-coil turbochargers help the engine deliver over 137 hp. from. power per liter of displacement and accelerate the Flying Spur V8 to 318 km / h.
The maximum power of the V8 engine is 550 hp. with., while the maximum torque of 770 Nm is achieved already at 2000 rpm and remains up to 4500 rpm.
Twin-scroll turbochargers feature two separate parallel ducts in the turbine housing, through which the exhaust gases flow to the turbine wheel blades. Such a solution acts as a guarantee of the development of high torque at a low crankshaft speed. The installation of turbochargers in the camber of the cylinder block made it possible to reduce the distance that the exhaust gases have to travel from the engine to the turbines. The turbocharger shaft can rotate at 176,000 rpm and deliver pressures of up to 1.6 bar. The impressive torque is delivered with lightning speed and accelerates from 0 to 100 km / h in 4.1 seconds.
In addition to the location of the turbochargers in the collapse of the cylinder block, among the features of the 8-cylinder power unit is the close location of catalytic converters to them. This arrangement allows the exhaust gas monitoring system to quickly reach its optimum operating temperature. The heating of the catalytic converters is accelerated by opening the wastegate of the turbochargers.
The two high pressure fuel pumps are driven directly from the camshafts. They supply fuel at pressures of up to 250 bar to eight solenoid-controlled injectors. The pressure developed by the pumps is 14 times higher than the pressure in a steam boiler required to move a 60-ton steam locomotive.
The injectors are located in the center of the combustion chambers next to the spark plugs. They atomize fuel through seven holes, which results in an optimal atomization pattern and, as a result, optimal formation of the fuel-air mixture. The special shape of the intake ports contributes to better air turbulence in the cylinders. This turbulent flow improves fuel distribution throughout the cylinder. An additional advantage is more complete combustion, after which less harmful substances are emitted into the atmosphere.
To increase resistance to significant loads and wear, the cylinders are coated with an iron alloy using an atmospheric plasma spraying process. As a result, the coating is durable, but at the same time very thin – only 150 microns, that is, like a sheet of paper.
To improve fuel efficiency at low engine load, when the torque does not exceed 250 Nm, and the crankshaft speed is 3500 rpm, it is possible to turn off four of the eight cylinders. At the same time, the transition to work on four cylinders is carried out imperceptibly for the driver and passengers and takes only about 20 milliseconds, which is ten times faster than blinking.
The engine uses a system with two-position cams of the intake and exhaust camshafts, due to which the second, third, fifth and eighth cylinders are switched off. By disabling four cylinders, fuel consumption is reduced by up to 30% (depending on load and speed), thereby increasing the range and reducing the environmental impact.
The new Flying Spur V8 focuses primarily on the driver, offering the incredible refinement, comfort and technology expected from a large, luxurious Gran Turismo.
The Flying Spur range features a fast-paced yet elegant look inspired by classic Bentley designs, best-in-class workmanship and original materials. The new version of the Flying Spur V8 is equipped not only with a modern engine, but also with the latest driver assistance and infotainment systems, which increase the level of safety, security and comfort on every journey.
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