BMW N74B66 engine

Power units of the N74 release work on a similar principle, are endowed with similar characteristics and embody modernized versions of previous models, have differences only in the calculation of devices. This is a line of the most powerful gasoline motors and top diesel power units. Mounted mainly on BMW 7 series, as well as Rolls-Royce Ghost and Rolls-Royce Wraith. Motors of this series are popular everywhere, including in three major countries such as the United States, Russia, China and to this day confirm the reputation of luxury cars. Rolls-Royce competes with such famous brands as Mercedes Benz S-class, Audi A8, Lexus LS, Jaguar XJ, Cadillac, Infiniti Q45 and others.

Engine specifications N74B66

Technical specifications

The BMW N74B66 engine is produced according to a personalized drawing, in order to use parts from previous engines to eliminate their inaccuracies and simplify the production stages.

The N74B66 gasoline engine is a V-shaped 12 cylinder unit with 4 valves per cylinder, turbocharger and injector fuel system with distributed direct injection. It is distinguished by engine displacement, which is 6592 cubic centimeters and maximum output from 563 to 624 horsepower, cylinder cross section 89mm, piston stroke 88.3 mm, torque from 780 Nm / 1500 rpm to 800 Nm / 5000 rpm. The start-stop system allows the engine to be started quickly and quietly. To minimize noise, the unit is equipped with dual water-cooled generators, and one of them is designed only for the starting battery. This is the result of the manufacturers’ development. The powerful 6.6 liter twin-turbo engine accelerates smoothly and lightning fast in perfect silence.

According to statistics, sports cars with turbo engines and compressors on average accelerate to 100 kilometers per hour in 10 seconds, cars of serial type accelerate to 100 kilometers per hour in 20 seconds. And only a couple of dozen cars in the world develop a speed of 100 kilometers per hour in 4 seconds. One of the first, a representative of this dozen is a sedan 2 generation Rolls-Royce. On average, according to the passport, fuel consumption ranges from 12 liters to 14 liters per 100 kilometers of mileage. The manufacturer recommends the use of AI 95 and AI 98 gasoline, no less. It is necessary to emphasize the advantages of this motor. They include a vacuum mechanism with a two-stage vacuum pump, a mechanism of high-precision fuel injection, an independent mechanism of piezo elements that guarantees ignition, a pair of air heaters operating on the principle of indirect through-air supercharging with indirect cooling and a mechanism of gas distribution Double-VANOS. Advanced camshaft and toothed roller chain arrangement, as well as equipping all types of N 74 motor groups with individual oil dispensing and crankcase ventilation mechanisms are the hallmarks of this series. The direct injection mechanism, i.e. jet injection, offers a great opportunity to increase the amount of fuel injected, the duration of injection and the distribution of the mixture in the combustion chamber. The power, torque and fuel metering mechanism benefit from this. The increase in the compression ratio of the mixture due to cooling by the injected fuel is the difference between this motor and turbo engines with an intake manifold injection mechanism. On the plus side, the xDrive all-wheel drive combines the most powerful motor with 12 cylinders.

Engine review on the example of two of the brightest representatives of the prestigious Rolls-Royce brand.

Rolls-Royce Ghost

The Rolls-Royce Ghost powertrain produces 563 horsepower at 5,250 rpm and 780 Nm of torque at 1,500 rpm through a turbocharger unit and an immense liter. The manufacturer praises the engine’s traction at low crankshaft speeds, providing impeccable response to the accelerator pedal. With a maximum speed limit of 250 kilometers per hour set electronically, acceleration to one hundred kilometers per hour ends up being 4.9 seconds. Fuel consumption varies accordingly with the preferred driving pace. From the calculation per 100 kilometers on a suburban highway at a moderate pace will be about 9 liters, at a mixed pace of about 13 liters and at an urban pace of approximately 20 liters. The work of 8 ranges of the automatic transmission is invaluable, which allows you to smoothly and quickly gain speed. The torque work, starting at low revs, is inaudible and picks up speed rapidly, with only at high revs can you hear the 12 cylinder engine slightly. The car gives an immediate reaction when pressing the pedal, without sudden jolts, which is certainly above all praise. It is worth noting the soft and unremarkable work of the brakes. These indicators of the motor are close to the indicators of sports cars. Its owner can become both a lover of quiet driving and a lover of high speeds.

Rolls-Royce Wraith

The Rolls-Royce Wraith powertrain is currently the most powerful of all Rolls-Royce Wraith models and has replaced the Rolls-Royce Ghost powertrain. The power unit is upgraded with a V12 6.6 Twin Turbo engine, producing 632 horsepower at 5600 rpm and 800 Nm of torque at 5500 rpm, with the help of a turbocharging system and an immense liter. With a maximum speed limit of 250 kilometers per hour set electronically, acceleration to one hundred kilometers per hour ends up being 4.6 seconds. From the calculation per 100 kilometers on a country road at a moderate pace will be about 9.8 liters, at a mixed pace of about 14 liters and at an urban pace of approximately 21 liters. The ZF 8-speed gearbox can determine the optimum speed based on GPS data, depending on the preferred driving style.

This engine is installed on the following models:

BMW 7-Series (G11, G12)