Mercedes-Benz is adding a second BlueEFFICIENCY model to its W204 C-Class range – the petrol-powered Mercedes-Benz C 350 CGI BlueEFFICIENCY. Stuttgart claims 8.3 litres of premium grade fuel consumed per 100km, and CO2 emissions of 193g/km.
Peak power for the 3.5 litre V6 engine is 292 horsepower and 365Nm of torque, which is more than the conventional port-injected 3.5L V6 of the C 350 by 20 horses and 15Nm. It is also more fuel efficient by 1.4 litres per 100km. The engine is mated to the 7G-Tronic automatic and takes the car up to 100km/h in 6.2 seconds.
The 3.5 litre V6 engine is claimed to be the world’s first engine (at its time of introduction in 2006) with spray-guided direct injection. In a conventional wall-guided direct injection engine (such as Volkswagen’s FSI), the injector points at an angle at a trough-shaped piston floor. The fuel hits the through, causing it to swirl up and mix with the air.
In a spray-guided direct injection engine, the piston floor is flat and a hollow cone of fuel forms at the injection nozzle thanks to a special nozzle shape. Benefits include the ability to run the engine in lean burn mode over an increased rev range.