Holden Workshop Manual

Hot new Mercedes-Benz SLK AMG gains cylinder deactivation

The latest engines coming out of the workshop use high-pressure direct injection and now AMG is adding a new trick, cylinder deactivation, to its efficiency repertoire. The new SLK AMG will be the first car to feature the new cylinder deactivation technology. With it, the engine will cut fuel and spark to four of its eight cylinders when it is running under 3600rpm.

This feature will only take effect if the driver has put the car in C mode, which stands for Controlled Efficiency, according to Mercedes-Benz. The company assures us the transition from four- to eight-cylinder operation will be imperceptible.

The new engine, displacing 5.5 litres, produces 310kW of power and 540Nm of torque. That represents a 45kW increase over the previous AMG 5.5-litre engine. Mercedes-Benz never offered an SLK AMG featuring the newer 6.3-litre engine V8.

Cylinder deactivation is not new — we've tested it already in V8 Holden Commodores and Caprices , and it's also available in the Honda Accord. But in its announcement, Mercedes-Benz draws comparisons between its technology and that of Formula One race cars, lest we think that AMG has become mundane.

With cylinder deactivation, direct injection and a new idle-stop feature, which turns off the engine when the car is stopped in traffic, the SLK AMG is claimed to have 30 per cent better fuel economy than its predecessor. Although considering that fuel test cycles will probably run primarily when the V8 is chugging away on just four cylinders, the variation between the posted numbers and real-world driving should be substantial.

The new Mercedes-Benz SLK AMG will be unveiled at the 2011 Frankfurt Auto Show.

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