December 18, 2003

Mercedes-Benz develops new six cylinder engine

Stuttgart, Germany – For the future SLK-Class car, Mercedes-Benz has developed a new 3.5 litre six-cylinder engine. Mercedes says it sets new standards in fuel consumption and quietness with a number of technical innovations.

With an output of 272 horsepower and 350 Newton metres of torque, the new Mercedes six-cylinder unit is one of the most powerful V6 engines in its displacement class. The maximum torque is available from 2500 rpm and remains constant over a wide engine speed range up to 5000 rpm, providing powerful acceleration.

For the first time in a V6 engine it has variable intake and exhaust camshaft adjustment, which increases the output and torque while contributing to fuel economy. A two-stage intake manifold, tumble flaps in the intake ducts and an intelligent heat management system are further technical highlights.

An intelligent heat management system also contributes to fuel economy. Mercedes engineers have developed a new, electronic map-controlled thermostat which is active in all engine operating situations. It directs the heat flows inside the powerplant in such a way that the engine oil and coolant are always at the best possible temperatures.

By virtue of variable camshaft adjustment, tumble flaps in the intake ducts, internal exhaust gas recirculation, secondary air injection and other features, the exhaust emissions of the new Mercedes six-cylinder engine are already at a very low level during the combustion process.

In addition to these engine-specific measures, an efficient emission control system ensures that exhaust emission values remain below the stringent EU 4 limits coming into force in 2005.

The crankcase and cylinder head of the new Mercedes six-cylinder are made of aluminium. The state-of-the-art, lightweight engine also has weight-reduced connecting rods, pistons and balancer weights which contribute to the exemplary smoothness of the unit. Between the cylinder walls, a balancer shaft counter-rotates with the crankshaft and compensates the inherent vibration moments of the V6 unit. The cylinder liners are in aluminium-silicon technology for particularly low friction, distortion and weight.

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