Mercedes-Benz unveils new V6 and V8 units, boasts increased power and efficiency –

Mercedes-Benz isn’t just making changes to its performance engines, like the new 5.5-liter twin-turbo AMG unit, but also on its mainstream powerplant lineup.

As such, it has just revealed two new direct injection units: a 4.7-liter twin-turbo V8 and a 3.5-liter naturally-aspirated V6. Both engines now feature a wide array of new technologies, from an improved direct injection, to a multi-spark system that works together with a direct auto start-stop mechanism.

The main goals of these new engines are to increase power output and to keep fuel averages plus emissions as low as possible.

The V8 engine now develops 435 HP (as opposed to the outgoing 388 HP), while reducing the fuel average by 22%, from 19.12 mpg to 24.75 mpg (on the EU test cycle). CO2 emissions have also dropped by 22%, from 288 g/km to 224 g/km. Last but not least, torque was increased to 516 lb-ft.

The V6 unit suffered a bigger change that its V8 brother, as its V angle was modified, from 90 degrees to 60. This resulted in a decreased weight, affecting both performance and fuel average. The new 3.5-liter engine develops 306 HP (as opposed to the previous 272 HP) and has a torque rating of 272 lb-ft. The unit is 24% more efficient, averaging 30.94 mpg and emitting just 177 g/km of CO2.

Both the twin-turbo V8 and the V6 will be appearing late this year on the S and CL Class models, with other cars getting them in 2011.

Source: Mercedes-Benz

Post tags: Tags: engines, mercedes benz cl, mercedes benz s class, Mercedes-Benz, technology