BMW N74B66 Engine Specs, Problems And Reliability

The BMW N74B66 engine was produced according to a personal drawing, in order to use parts from previous released engines, eliminate their errors and simplify the production stages.

The power units of the N74 engine release operate on a similar principle, are endowed with similar characteristics and embody upgraded versions of previous models, they differ only in device calculations.

This is a line of the most powerful gasoline N74B66 engines and top-end diesel powertrains. They were mounted mainly on the BMW 7 series, as well as the Rolls-Royce Ghost and Rolls-Royce Wraith.

Engine of this N74B66 series are popular everywhere, including in three large countries such as the USA, Russia, China, and to this day confirm the reputation of luxury cars.

Rolls-Royce competes with cars of such well-known brands as Mercedes Benz S class, Audi A8, Lexus LS, Jaguar XJ, Cadillac, Infiniti Q45 and others.

 BMW N74B66 Specifications

The N74B66 gasoline engine is a V-shaped 12-cylinder unit with 4 valves per cylinder, with a turbine supercharger and a fuel injection system with distributed direct injection.

It features an N74B66 engine capacity of 6592 cubic centimeters and a maximum performance of 563 to 624 horsepower, a cylinder diameter of 89mm, a piston stroke of 88.3 mm, a torque of 780 Nm / 1500 rpm to 800 Nm / 5000 rpm.

The start-stop system allows you to start the N74B66 engine quickly and silently. Dual water-cooled generators are built into the unit to minimize noise, and one of them is designed for the starter battery only. This is the result of manufacturers’ development powerful.

According to statistics, sports cars with turbo engines and compressors on average accelerate to 100 kilometers per hour in 10 seconds, serial-type cars accelerate to 100 kilometers per hour in 20 seconds.

And only a couple of dozen cars in the world reach a speed of 100 kilometers per hour in 4 seconds. One of the first representatives of this ten is the 2nd generation Rolls-Royce sedan.

On average, according to the passport, fuel consumption ranges from 12 liters to 14 liters per 100 kilometers. The manufacturer recommends the use of AI 95 and AI 98 gasoline, at least.

Emphasis should be placed on the merits of this N74B66 engine. These include a vacuum mechanism with a two-stage vacuum pump, a high-precision fuel injection mechanism, an independent piezoelectric mechanism that guarantees ignition, a pair of air heaters, acting on the principle of indirect through-pressure with indirect cooling and the Double-VANOS gas distribution mechanism.

An improved arrangement of camshafts and a toothed roller chain, as well as a complete set of all types of groups N74 engine with an individual mechanism for dispensing oil and crankcase ventilation is a hallmark of this series.

The direct injection mechanism, namely jet injection, provides a great opportunity to increase the amount of fuel injected, the duration of injection and to spread the mixture in the combustion chamber.

At the same time, power, torque and the fuel consumption metering mechanism benefit from this. The increase in the compression ratio of the mixture due to cooling by injected fuel is the difference between this N74B66 engine and N74B66 turbo engines with an injection mechanism into the intake manifold.

An overview of the N74B66 engine 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 5250 rpm and 780 Nm of torque at 1500 rpm with a turbocharger and a huge displacement.

The manufacturer praises the engine traction at low crankshaft speeds, which provides an impeccable response to pressing the accelerator pedal.

With a maximum speed limit of up to 250 kilometers per hour, installed by electronics, acceleration to one hundred kilometers per hour in the end is 4.9 seconds.

Fuel consumption varies according to the preferred pace of movement. Based on the calculation for 100 kilometers on a country road at a moderate pace, it will be about 9 liters, at a mixed pace about 13 liters and at a city pace about 20 liters.

The work of 8 automatic transmission ranges is invaluable, which allows you to smoothly and quickly gain momentum.

The work of torque, starting from low revs, inaudibly and rapidly picks up speed, while only at high revs can you hear a little of the 12-cylinder engine.

The car gives an immediate response when you press the pedal, without sharp shocks, which is certainly beyond praise.

It is worth noting the soft and inconspicuous work of the brakes. These engine indicators are close to those of sports cars.

Its owner can be both a lover of calm driving and a lover of high speeds. These engine indicators are close to those of sports cars.

Its owner can be both a lover of calm driving and a lover of high speeds. These engine indicators are close to those of sports cars. Its owner can be both a lover of calm driving and a lover of high speeds.

Rolls-Royce Wraith

The Rolls-Royce Wraith car unit is currently considered the most powerful in comparison with all releases of the company and has replaced the Rolls-Royce Ghost car.

The power unit is upgraded with a V12 6.6 Twin Turbo engine, produces 632 horsepower at 5600 rpm and 800 Nm of torque at 5500 rpm of the crankshaft, using a turbocharging system and an immense displacement.

With a maximum speed limit of up to 250 kilometers per hour, installed by electronics, acceleration to one hundred kilometers per hour in the end is 4.6 seconds.

Based on the calculation for 100 kilometers on a suburban highway at a moderate pace, it will be about 9.8 liters, at a mixed pace about 14 liters and at a city pace about 21 liters.