Thursday, July 21, 2011

Mercedes SLK 55 AMG: Official new 5.5 naturally aspirated V8 engine M152

Mercedes officially confirmed that the engine in the SLK 55 AMG is a naturally aspirated V8 with direct injection of fuel to 5,461 cc. The power of this unit, code-named M152, is 422 hp at 6800 rpm while peak torque of 540 Nm affects the value at 4500 rpm. Thanks to the aluminum base, weighs only 187 kg and is equipped with piezoelectric injector capable of ensuring a fuel injection pressure of 200 bar.

Compared to the M157 of the CLS 63 AMG and the lack of the two turbochargers, the engine has new intake, cylinder heads renovated housing of valves revisited and a new fuel pump. Significant reduction in consumption mode of operation to 4 cylinders in certain conditions, calculated by the electronic control unit, the engine will be capable of running on half its cylinders to the benefit of fuel consumption and emissions, a technology derived directly from world of Formula 1 and the durations used or under the Pit Stop Car Safaty.

Capable of running up to 7200 rpm, the unit is also equipped with Start & Stop system and energy recovery during braking. These interventions have helped to reduce power consumption by 30% compared to the previous SLK AMG, despite 62 hp and 30 Nm of torque more: the average consumption of 8.5 L/100 km is said, against 12 of the old units.

CO2 emissions amounted to 199 instead of g / km. Euro 5. The automatic shutdown of the cylinder can only be made in the driving modes "C" (Controlled Efficiency), the selectable automatic transmission: in this way the engine can operate at half of its split from the 800 up to 3600 rpm. Even at these operating conditions the driver is always available to 230 Nm from 3600 rpm onwards, when you need more power, the cylinders 2, 3, 5 and 8 are reactivated in 30 milliseconds in a process that is undetectable for the occupants of the passenger.

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