New V6 and V8 engines for Mercedes-Benz
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The new Mercedes-Benz V6
The new Mercedes-Benz V8
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Mercedes-Benz
9th May, 2010
Mercedes-Benz is setting previously unachievable efficiency standards
in the premium segment with completely newly developed V6 and V8 engines.
The new V8 engine has a displacement of 4,663 cc and develops an output of 320 kW (435 hp), which is around 12 per
cent more than its predecessor despite approx. 0.8 litres less displacement. Torque has increased from 530 Nm to 700
Nm – i.e. by no less than 32 per cent. Fuel consumption has however been reduced by 22 per cent.
With the same 3,499 cc displacement as its predecessor, the new V6 engine develops 225 kW (306 hp). Torque has
increased from 350 Nm to 370 Nm. Here too, the improvement in fuel efficiency is remarkable. The S 350 with the new
V6 engine consumes an economical 7.6 litres per 100 kilometres, a saving of 24 per cent compared to its
predecessor.
Mercedes-Benz has achieved this considerable leap in efficiency with the use of a start/stop function as standard
and other features such as newly developed, third-generation direct petrol injection with spray-guided combustion,
multiple injection and multi-spark ignition. With this new generation of V-engines, Mercedes-Benz is clearly
demonstrating that with concerted further development, internal combustion engines still have a great deal of
potential, and that V6 and V8 engines with their great running refinement can continue to be used to good effect in
the future.
Considerably less fuel consumption despite a much higher output was the development objective for the new
Mercedes-Benz V-engine generation, which will initially be used as an 8-cylinder in the CL-Class, and later in the
S-Class from the northern autumn 2010. Mercedes-Benz developed the new six and eight-cylinder units because optimised
internal combustion engines continue to have specific advantages over other drive systems with respect to operating
range and refuelling time and costs, while offering the greatest short-term potential to achieve significant fuel
savings in day-to-day operation.
"The new six and eight-cylinder engines from Mercedes-Benz are a unique synthesis of effortless power delivery,
comfort and efficiency," says Dr. Thomas Weber, the member of the Daimler AG Executive Board responsible for
corporate research and development at Mercedes-Benz Cars. "Both impress with refinement at the highest level, as
well as exemplary environmental compatibility."
The new Mercedes-Benz engine family is uncompromisingly based on modularisation. It allows the use of a start/stop
function, 4MATIC all-wheel drive and combination with a hybrid module.
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The V8 is in a new league of its own
On the basis of its predecessor, the new V8 has undergone concerted further development. For example, it has a 15
per cent smaller displacement (4,663 cc rather than 5,461 cc) but generates 320 kW (435 hp) and therefore around 12
per cent more output than the preceding unit (285 kW/388 hp). Whereas the current CL 500 consumes 12.3 litres per 100
kilometres, this figure drops to 9.5 litres with the new engine – a reduction of 22 per cent. CO2 emissions have
likewise fallen by 22 per cent, from 288 g/km to 224 g/km – an outstanding figure for this performance class. At the
same time torque has been raised from 530 Nm to 700 Nm – an increase of 32 per cent.
As the high maximum torque is already available from 1,800 rpm, the new high-tech V8 already exhibits an
outstanding power delivery at low engine speeds, together with smoothness and refinement that is remarkable even for
an eight-cylinder.
In the new V8, Mercedes-Benz engineers primarily achieved a high output for a lower displacement by using two
turbochargers - one for each bank of cylinders. The chargers were configured to provide high torque even at low
engine speeds – compared to the previous engine the result is an increase of more than 40 per cent at 2,000 rpm. An
outstanding 600 Nm is available between 1,600 and 4,750 rpm. The driver therefore perceives no turbo delay, but
experiences the same pleasant and effortless performance from the new V8 as that delivered by a mighty, naturally
aspirated 7 litre engine.
The V6 particularly impresses with its low fuel consumption
The new V6 engine is naturally aspirated, and has the potential for future use of a turbocharger thanks to the
modular design concept. The most striking change between the new V6 unit and its predecessor is a reduction in the
V-angle between the cylinder banks from 90 degrees to 60 degrees. This enabled the balancer shaft countering
primary vibrations to be omitted, and as a result the driver registers an outstanding level of comfort.
A completely new intake and exhaust gas system with a variable-resonance intake manifold and optimised airflows
was also developed for the new V6. This enabled the output of the 3,499 cc engine to be increased to 225 kW (306 hp)
(Previous engine of the same displacement in the S-Class: 200 kW/272 hp). Torque has increased from 350 Nm to 370 Nm,
and is available between 3,500 and 5,250 rpm.
The improvement in fuel consumption is particularly remarkable. The S 350 with the new V6 engine consumes just
7.6 litres per 100 kilometres (CO2 emissions: 177 g/km), which makes it 24 per cent more economical than its
predecessor (10.0 l/100 km). It also makes the new V6 the benchmark in its segment for a comparable output
(provisional figures).
Innovative technology makes V6 and V8 engines fit for the future
Both the new V6 and the new V8 from Mercedes-Benz have aluminium crankcases, pistons and cylinder heads. The
crankshaft, connecting rods and valves are of special forged steel.
The technology package in the new engine generation includes a number of new developments that are unique in this
combination:
- In combination with multi-spark ignition, a further developed, third generation direct fuel injection system
with spray-guided combustion and piezo-electric injectors offers further possibilities for fuel savings – in the V8
by means of an improved, homogeneous combustion process, and in the V6 by a new, stratified combustion process with
a considerably extended characteristic map and fuel-efficient lean-burn technology.
- In conjunction with start/stop technology, shift point adjustment and specific friction-reducing measures,
improvements in day-to-day fuel consumption by more than 20 per cent are possible.
- Power consumption by ancillary units has been reduced. These include an optimised water pump with 2nd-generation
thermal management, a demand-controlled oil pump, a volume-controlled high-pressure fuel pump and an intelligent
generator management system.
Light weight construction techniques and detailed improvements have also reduced in-engine friction considerably
compared to the previous engine.
With its new-generation V-engines, Mercedes-Benz is clearly demonstrating that with concerted further development,
internal combustion engines still have a great deal of potential, and that V6 and V8 engines with their high level
of refinement are fit for the future.
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