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7 Series - F01/F02 (2008 - ...) - Power Units

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Power units: superior, dynamic, and very efficient.
The world’s most efficient V8 gasoline engine, the most powerful straight-six in the BMW engine range, and the first representative of a new generation of straight-six diesels: The choice of power units available right from the start upon the introduction of the new BMW 7 Series is full of superlatives.
The three engines combine dynamic power and performance, supreme refinement and outstanding efficiency, offering a varying degree of these individual features while nevertheless sharing one overall forte they all have in common: In their respective segments, they offer an unparalleled balance of performance, on the one hand, and economy, on the other. The new eight-cylinder in the BMW 750i is the most efficient engine in its class. The two six-cylinders, in turn, enter a range of power and performance so far offered only by an eight-cylinder, at the same time combining this potential with exemplary efficiency and much lower weight. Reduced load on the front axle ensures a harmonious balance and thus enhances the overall agility of the car. The new power units are therefore worthy representatives of the BMW EfficientDynamics development strategy also serving to provide a number of further innovations in the new BMW 7 Series. Apart from the new engines, features such as Brake Energy Regeneration, on-demand management of ancillary units, consistent lightweight technology, and opti-mised aerodynamics including electronic management of the air flaps on the BMW 740i and the BMW 730d reduce both fuel consumption and emissions to an even lower level than before.
This enhancement of efficiency is particularly impressive with the new BMW 730d: Offering average fuel consumption of just 7.2 litres/100 kilometres (39.2 mpg imp) in the EU test cycle, this is the most economical car in its class.


Unique: eight-cylinder gasoline engine with Twin Turbo technology and High Precision Injection in the new BMW 750i.
The new BMW 7 Series is quite clearly the perfect synthesis of elegance and sportiness. Its engines combine superior refine-ment with dynamic power and performance, making them simply ideal for this outstanding saloon. The new eight-cylinder power unit in the BMW engine range offers all these qualities at the highest level of power and performance: Displacing 4.4 litres, the new V8 with Twin Turbo technology and direct petrol injection (High Precision Injection) offers maximum output of 300 kW/407 hp in the speed range between 5,500 and 6,400 rpm. Peak torque is 600 Newton-metres or 442 lb-ft maintained consistently between 1,750 and 4,500 rpm.An innovation in technology to be seen for the first time on an eight-cylinder gasoline engine is the arrangement of the turbo-chargers and catalysts in the V-section between the two rows of cylinders. This makes the engine unusually compact and at the same time allows re-arrangement of the intake and exhaust manifolds. The result is a reduction of manifold length and larger cross-sections, with pressure losses on the intake and exhaust side being minimised significantly.
The all-aluminium power unit of the BMW 750i offers the quali-ties typical of an eight-cylinder in exceptionally sporting style.
The engine combines superior torque and pulling force from low speeds with an ongoing and truly impressive surge of power, the BMW 750i accelerating from a standstill to 100 km/h in just 5.2 seconds. Power reserves remain more than sufficient also at higher speeds, acceleration thus continuing smoothly and swiftly all the way to 250 km/h or 155 mph, when the electronic control unit cuts in to keep top speed to this limit.

Twin Turbo technology for an ongoing surge of power and muscle.
The power and performance so characteristic of the new V8 power unit is determined primarily by BMW’s Twin Turbo technology. Featuring two turbochargers each supplying four cylinders with compressed air, this superior technology ensures unparalleled spontaneity in the engine’s reaction to the gas pedal. The turbo “gap” so typical of a conventional turbocharged engine – the time passing until the turbocharger develops its special “boost” – has been eliminated completely.
The engine therefore revs up smoothly and full of power, maintaining its high level of torque throughout an exceptionally wide speed range. In its power characteristics it is reminiscent of a significantly larger normal-aspiration engine, while the weight of the engine with its all-aluminium crankcase is significantly lower. Not only the weight, but also the fuel consumption of this new V8 power unit is exceptionally low for an engine in this performance category.
An important factor contributing to this superior fuel economy is double- VANOS infinite camshaft control now a regular feature of BMW power units. Double-VANOS is indeed one of the technologies which enables the V8 to develop exceptionally high torque from low engine speeds.
A key function in ensuring maximum fuel efficiency is provided by High Precision Injection, the second generation of direct gasoline injection featuring piezo-injectors positioned in the cylinder head directly next to the spark plugs and delivering fuel into the combustion chambers at a pressure of 200 bar. This principle and the particular configuration of the fuel supply sys-tem guarantees extremely precise fuel dosage, with a positive effect on fuel economy, exhaust emissions, and engine noise.
Average fuel consumption of the BMW 750i in the EU test cycle is 11.4 litres/ 100 kilometres, equal to 24.8 mpg imp. Compared with the former model, this is an improvement by approximately 3 per cent, with an increase in engine output by 30 kW or 41 hp.
In other words, the new V8 power unit is entering the level of power and performance nowadays only offered by twelve-cylinder engines while at the same time offering the highest level of efficiency worldwide in the eight-cylinder segment. CO2 emissions by the new BMW 750i are 266 grams per kilometre, fulfilling both the US exhaust standard and the EU 5 classification in Europe.

Even more power: straight-six with Twin Turbo and High Precision Injection in the BMW 740i.
The second gasoline engine version of the new BMW 7 Series boasts the most powerful straight-six within BMW’s complete range of power units. Like the new V8, the power unit featured in the BMW 740i comes with the combination of Twin Turbo tech-nology and High Precision Injection exclusive to BMW, offering unparalleled power and performance combined with truly impressive all-round economy, particularly in consideration of the car’s dynamic driving potential.
On this latest version of BMW’s 3.0-litre straight-six, engine output has been increased by appropriate modification of the turbocharger system to 240 kW/326 hp. This peak power comes at an engine speed of 5,800 rpm, with maximum torque of 450 Newton-metres or 332 lb-ft available from just 1,500 rpm.
On the straight-six with Twin Turbo technology, two exhaust gas turbochargers each deliver compressed air to three cylinders. The low inertia of these relatively small turbochargers ensures an optimum response with a virtually immediate surge of power and performance, building up turbocharger pressure without the slightest delay from low engine speeds.
The engine is therefore able to develop superior power and torque very quickly indeed, in a process further enhanced by infinite double-VANOS camshaft control. For the driver this unique quality of BMW’s Twin Turbo gasoline engines means a particularly superior form of elasticity and flexibility on the road.The extremely dynamic surge and build-up of power is also promoted by the high compression ratio of the engine made possible by High Precision Injection. With the fuel/air mixture being cooled by the direct injection of fuel, the compression ratio is higher than on a turbocharged engine with manifold injection.
Engine efficiency is likewise improved in the process, offering more power on less fuel.
Yet a further feature is the central arrangement of the piezo-injectors between the valves and in the immediate vicinity of the spark plug ensuring particularly precise dosage of the fuel injec-ted also on the straight-six power unit with High Precision Inject-ion. The supreme standard of power and performance offered by the straight-six with Twin Turbo and High Precision Injection was previously conceivable only with a far larger eight-cylinder.
Now BMW’s most powerful six-cylinder offers the same output and muscle on far less fuel. Engine weight is also much lower, inter alia on account of the all-aluminium crankcase, which naturally benefits the agility of the entire car: The BMW 740i accelerates to 100 km/h in 5.9 seconds and has a top speed limited electronically to 250 km/h or 155 mph.
Average fuel consumption in the EU test cycle is 9.9 litres/100 km (equal to 28.5 mpg imp), the CO2 emission rating is 232 grams per kilometre. Compared with its predecessor, the new BMW 740i therefore offers 15 kW/20 hp more power and, at the same time, 12 per cent better fuel economy.
And it almost goes without saying that the new BMW 740i fulfils all the requirements of the EU 5 emission standard.

Ultra-modern diesel power: new straight-six with third-generation common-rail fuel injection in the BMW 730d.
The first representative of a new generation of six-cylinder diesel engines is now making its world debut in the new BMW 730d.
Introducing this outstanding engine, BMW is indeed further enhancing its worldwide leadership in the development of diesel power units.
Completely new from the ground up, this outstanding engine consistently implements the BMW EfficientDynamics develop-ment strategy by enhancing output and performance on less fuel and with lower emissions. Displacing 3.0 litres, the power unit develops maximum output of 180 kW/245 hp at engine speed of 4,000 rpm. Maximum torque of 540 Newton-metres or 398 lb-ft comes at just 1,750 rpm, meaning that compared with its predecessor the new BMW 730d offers an increase in output by 10 kW/16 hp on fuel consumption down by 10 per cent.
As a result, the new BMW 740d clearly ranks right at the top in the luxury segment in terms of all-round economy.
Both the crankcase and the cylinder head on the new diesel engine are made of ultra-strong aluminium alloy. The thoroughly upgraded turbocharger system with variable intake geometry ensures superior development of power and performance tailored harmoniously to current driving conditions and require-ments. Fuel is supplied by third-generation common-rail direct injection incorporating piezo-injectors and operating at a peak pressure of 1,800 bar.
The injectors positioned in the centre of the combustion cham-bers and the valves in vertical arrangement guarantee a smooth and constant combustion process and help to reduce raw emissions at the same time. The diesel particulates filter and the oxidation catalyst are housed in the same unit positioned close to the engine directly downstream from the turbocharger turbine. A newly developed cylinder head made of aluminium serves to optimise engine acoustics, with engine noise and vibrations in the warming-up phase minimised also through the use of innovative ceramic glow plugs again serving to enhance engine efficiency. A further feature also important in this context is that the new diesel engine, through its lower height and the rearrangement of the chain drive and vacuum pump, offers optimum conditions for fulfilling future demands and standards in pedestrian safety. Weighing 185 kg or 410 lb, the new six-cylinder diesel is another 5 kg lighter than its predecessor. Again, this optimisation of weight serves to enhance not only the efficiency of the entire vehicle, but also its agility and dynamic handling on the road: The new BMW 730d accelerates to 100 km/h in 7.2 seconds and reaches a top speed of 245 km/h or 152 mph. Offering average fuel consumption of 7.2 litres/100 kilometres (equal to 39.2 mpg imp) in the EU test cycle, the BMW 730d is at the same time the most economical car in its segment, maximum cruising range of more than 1,100 kilometres or 680 miles likewise setting a new standard.
The CO2 rating of the new BMW 730d is 192 grams per kilometre, and the new diesel engine naturally also fulfils all the requirements of the EU 5 emission standard.

Last Updated on Monday, 12 April 2010 14:36  

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