From BMW's press material
Munich. Six-cylinder power units have always had particular appeal, offering not only supreme
smoothness and refi nement, but also superior power and performance as well as a truly emotional
driving – or, in this case, riding – experience. A further point is that the typical sound of a
straight-six almost like a turbine is absolutely incomparable, with straight-six power units at BMW
having stood for fascinating engine technology in BMW cars for more than seven decades.
Looking at motorcycles, inventive engineers have also tried time and again to offer the enthusiast
the thrilling concept of a straight-six power unit. But while a few engines in straight-six
configuration have indeed been fitted in motorcycles both lengthwise and crosswise, the straight-six
has never really made a genuine breakthrough neither on production models nor in motorcycle racing.
Depending on the way the engine was fitted, six cylinders in-line inevitably made the engine either
very long or very wide, creating disadvantages in terms of the running gear, weight distribution and
the centre of gravity. A further drawback was much higher engine weight usually setting off the
benefits of extra engine power.
Enter text herThe BMW Concept 6 now proves that a straight-six, benefiting from the most advanced construction and
production technology, may offer not only unique prestige, but also a supreme standard of riding
dynamics.
The new BMW straight-six will further expand the K-Series in the foreseeable future. The fi rst model
to be introduced will be an innovative and luxurious BMW touring machine. Refl ecting the tradition
of the BMW K-Series, this will of course be a genuine top-of-the-line product.
Highly compact and dynamic six-cylinder. The starting point for this dynamic introduction of the straight-six in the new Concept 6 from BMW
Motorrad is of course the extremely compact form and configuration of the engine. The power unit is
approximately 100 mm or 4" slimmer than all former straight-six production engines and only a bit
wider than a large-capacity straight-four with conventional technology.
The reduction in width is achieved in particular by the slightly over-square bore: stroke ratio with
relatively long stroke and very small gaps between cylinders. To achieve this very compact
configuration with minimum width, the electrical ancillaries and their drive components are
positioned behind the crankshaft in the open space above the transmission.
.High-tech lightweight construction in all areas serves to make the power unit relatively light from
the outset, important components in this context being the two hollow-drilled camshafts and the very
light connecting rods. The perfect compensation of masses ensured by the configuration and layout of
the engine avoids the need for a balance shaft and its drive elements on the new straight-six, which
again means lower weight and enhanced running smoothness.
In its layout, the straight-six featured in the Concept 6 follows the well-known straight-four in the
K 1300 model series, again coming with cylinders tilted to the front by 55°. This ensures not only a
low centre of gravity, but also very good weight balance as an element essential above all under
sporting conditions for precise feeling and clear feedback from the front. A further advantage is
that the tilted engine provides extra space for the aerodynamically positioned intake manifold
directly above the engine and allows ideal configuration of the frame profiles following the fl ow of
power.
The straight-six featured in the BMW Motorrad Concept 6 comes with dry sump lubrication. Apart from
greater reliability even under extreme conditions, dry sump technology serves to keep the crankcase
particularly low and fl at, with the engine being fitted lower down and masses concentrated around
the centre of gravity. Doing without an oil sump, the engine may be positioned far lower than on a
conventional layout.
The oil reservoir is provided by an oil tank integrated at the rear of the engine block. This avoids
the need for a separate tank, again helping to make the entire power unit more compact and reduce
weight to a minimum.
Maximum supremacy in running refinement and performance. Designed and laid out as a straight-six, the engine also opens up new dimensions in motorcycling in
terms of supremacy, power reserves, performance and running refinement.
Output of the new six-cylinder will be in approximately the same range as on BMW’s 1.3-litre
straight-four power units. Torque, on the other hand, will be right at the top of the range, even in
comparison with the largest motorcycle engines, such superior power and muscle coming inter alia from
engine capacity of no less than 1.6 litres.
The engine’s power and performance characteristics are equally impressive, offering 130 Nm or 96 lb-
ft of torque from just 2,000 rpm and at the same time revving up almost to 9,000 rpm – a dynamic
potential quite unparalleled in the tourer segment. This alone qualifies the engine of the Concept 6
as the ideal power unit for a wide range of different motorcycles.
Environmental compatibility and all-round economy re-defined. The Concept 6 shows the absolute supremacy of its six-cylinder drive system also in ecological and
economic terms. Fuel consumption of this six-cylinder naturally equipped with a fully controlled
catalytic converter is lower than
on a comparable four-cylinder under normal touring conditions. The use of E-gas technology (ride-by-
wire) then offers further potentials for enhanced fuel economy and riding dynamics throughout a wide
range of different riding modes and conditions. And last but not least in this context, the straight
-six power unit featured in the Concept 6 offers long inspection intervals through the use of cup
tappets controlling the engine valves.
Dynamic and powerful design in Café Racer style. Supremacy and dynamism are also borne out clearly by the thrilling design of the Concept 6 and, as
usual, this project from BMW Motorrad is more than “just” the attempt to develop a motorcycle of a
kind never seen before.
Working on Concept 6, the designers at BMW Motorrad have therefore focused yet again on technical
function and quality and, in particular, the emotional element bringing together man and machine.
Their rule, quite simply, is that a motorcycle must not only follow the laws of functionality, but
also arouse emotion in all its facets. In a nutshell, therefore, the machine must be simply
thrilling.
Precisely this is why the design of the Concept 6 focuses in particular on the powerful straight-six
engine as the heart of the machine. Conceived as a mixture of classic and modern styling elements in
motorcycle construction, the Concept 6, with its long front end and short rear, takes up the design
language of the legendary Café Racer. Powerful and muscular, the body elements extend around the
power unit fi nished in a special platinum colour, presenting the engine almost adoringly from every
angle.
Smooth and soft lines ensure fully organic integration of the power unit within the machine, while at
the same time they create a powerful, exciting and dynamic contrast to the sharply contoured front
and rear ends.
The so-called Split Face, a well-known design element of the latest models from BMW Motorrad, extends
smoothly from the front of the fairing all along the top of the fuel tank made of carbon-fibre, again
confirming the high technological standard of the Concept 6 and forming an exciting contrast to the
outer shell in aluminium with its white layers. The division into three sections created by the Split
Face is further accentuated at the front by the LED headlight integrated longitudinally in the
machine in its rod shape and by the slender LED rear light extending far up into the seat hump.
The powerful and supreme character of the Concept 6 is also underscored by the six-chamber exhaust
system complete with sidepipes and the strong presence of the intake ducts again fi nished in
platinum look. Aerodynamic components such as the twin-tipped engine spoiler and the air guide
elements derived from the design of the new S 1000 RR Supersports, on the other hand, bridge the gap
between functional and clearly visible technology, on the one hand, and the soft and smooth design of
other body elements, on the other.
Innovative suspension technology and equipment.
The suspension of the BMW Motorrad Concept 6 is built around a light-alloy bridge frame as well as
Duolever and lightweight Paralever arms holding and guiding the wheels front and rear. Seventeen-inch
HP forged wheels as well as the extra-large brake system with its six-piston fi xed callipers
emphasise the sporting look of the new machine and its high level of technology.
The outstanding supremacy of the Concept 6 and its drivetrain is also refl ected by details such as
the instrument panel intentionally kept in minimalist design but nevertheless completely equipped
with all the instruments and gauges required. While a digital display performs its usual function of
clearly presenting road speed, there is intentionally no rev counter on account of the supreme fl ow
of power at all speeds. So instead of a conventional rev counter, a LED display shows the rider at
all times how much torque is readily available whenever required.