V6 diesel engine from Mercedes
3 January 2005
Mercedes-Benz has announced new 6-cylinder diesel engine to replace the current in-line five and six cylinder engines, which are now used in such models as the C270 and E320, respectively. The new V6 engine, to enter series production in March 2005, has a power rating of 165 kW (224 hp) at 3800 rpm, thus representing a power increase by up to 38% over the existing five-cylinder engine, and 9% over the in-line six-cylinder. A maximum torque of 510 Nm (376 lb-ft) is available between 1600 and 2800 rpm.
Fuel consumption of the V6 engine remains at the previous levels, said Mercedes. The E320 with the in-line six cylinder 150 kW engine has a fuel economy of 6.9 l/100 km in the Euro 3 version, and 7.7 l/100 km in the Euro 4 version (34.0 and 30.5 mpg, respectively).
Selected features of the new engine include:
- Six cylinders in the V configuration at a 72° angle, with four valves per cylinder. Through the use of light-weight materials, the weight of the unit has been reduced to 208 kg—roughly the level of the in-line five-cylinder engine.
- The charge air system features a variable geometry turbocharger, combined with a downstream intercooler which reduces the temperature of the air by up to 95°C. After the intercooler and an EGR throttle, the air flows into a charge air distribution module, which evenly distributes the air into each cylinder. The distribution module features an integral, electrically controlled intake port shut-off function which allows to control the intake port cross-section for each cylinder, also affecting the swirl.
- Third-generation piezo-electric common rail fuel injection system with injection pressures up to 1600 bar. The injector nozzles have eight holes, up from the previous seven. Two pilot injections are provided for smoother combustion process and noise reduction.
- Euro 4 emissions are assured through an exhaust gas recirculation (EGR) system and two oxidation catalysts. In selected markets, the engine will be additionally equipped with a diesel particulate filter (DPF).