Automotive Intelligence - the web for automotive professionals and car enthusiasts
September 11, 2008
With the new diesel engine, which celebrates its world premiere in this model, Mercedes-Benz shows that frugal consumption and high output - and with them both environmentally-friendly driving and driving pleasure - can be mutually compatible.
A displacement of 2143 cc, 150 kW / 204 hp, and 500 Nm of torque - these are the engine's key figures. Figures that place this newly-developed four-cylinder diesel engine in the top position among the diesel engines of its class. At the same time, in the C 250 CDIBlueEFFICIENCY Prime Edition, the engine consumes on average just 5.2 litres of fuel per hundred kilometres (NEDC), a value achieved by no other comparable motor car.
Apart from exceptional power output figures, the new powerplant offers significantly improved torque build-up from low engine speeds, compared to its predecessor model. The benefit of this is that in everyday driving situations it enables low-consumption driving at low engine speeds. In addition, the new engine will assume market leadership in terms of untreated exhaust emissions. Already today, it complies with the future EU5 emissions standards and, beyond that, has the potential to comply with the EU6 and BIN5 standards as well.
Exemplary figures in terms of power output, consumption and emission characteristics are achieved by the new engine thanks to the implementation of a whole package of innovative technologies. This includes among other things: a maximum ignition pressure of 200 bar, fourth-generation common-rail technology with a rail pressure increased by 400 bar to 2000 bar, as well as a new piezo-injector concept with direct nozzle needle control for greater flexibility in injection timing, leading to smoother running of the engine, larger, variable oil spray nozzles and variable water pump, dual-stage supercharging.
Another design innovation is the camshaft drive positioned at the rear. This way, with a north-south installation design and engine bonnet rising towards the rear, it is possible to comply even better with pedestrian protection regulations.
For an engine of its displacement, it is exceptionally compact, so that it can be fitted in different installation spaces. Beginning in 2008, this new four-cylinder diesel engine will replace four of the existing diesel engines at Mercedes-Benz. It can be installed either lengthways or crossways in various model series, and several power rating variants will be available. Apart from the C-Class, the engine will also be installed in the E-Class, in the new GLK-Class and in the future E‑Class Coupé. With its impressive output figures, the new engine will replace higher-displacement engines in heavier vehicles, where it will be able to reduce consumption effectively through this "downsizing".
In the Mercedes-Benz C 250 CDI BlueEFFICIENCY Prime Edition the new diesel engine is combined with a sporty six-speed manual transmission with overdrive. This, too, contributes to the great efficiency of the model. Furthermore, Mercedes-Benz engineers have drawn up an additional package of measures in order to achieve the most exceptional consumption figures. The package includes among other things: aerodynamic finishing touches, with particularly airflow-enhancing exterior-mirror housings as well as smooth underbody cladding; newly developed tyres that reduce rolling resistance by 10 percent; an efficient energy-management system with adaptive power steering, which with the help of an additional valve, closes the flow of the power-steering pump when it is not required.
Useful information: new gearshift and consumption display on dashboard
Experience from Mercedes-Benz eco-training shows that the driver, too, can save fuel by adopting an energy-conscious style of driving - and also do that without compromising driving pleasure. In the C 250 CDI BlueEFFICIENCY Prime Edition a newly-developed gearshift display on the dashboard assists the driver by informing him of the best moment to shift gear in order to save fuel. In addition to this gearshift recommendation, the instrument cluster shows the precise current fuel consumption.
Prime Edition limited to 5000 units
The C 250 CDI BlueEFFICIENCY Prime Edition model can be delivered in obsidian black, palladium silver or iridium silver. It is also optionally available in the special paint finish diamond white metallic. The sporty appearance can be emphasised even more forcefully with the optional AMG sports package, which includes distinctively-styled front and rear aprons as well as side skirts.
Production of the C 250 CDI BlueEFFICIENCY Prime Edition is limited to 5000 units. It is a consummate performer in terms of its sportiness, environmental protection and economic efficiency. Its price (including VAT) is 40,638.50 euros.
(September 8, 2008)