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5.5L V8 Kompressor
The AMG 5.5 Liter Kompressor promises unlimited driving potential in
any situation - track or city streets, hillside
or highway.
This is a reprint from press information supplied by Mercedes-Benz:
An abundance of power and high-tech components from the world of motorsport - these are the major features of the
5.5-liter supercharged V8 engine. It comes with excellent credentials: a maximum output of 373 kW/507 hp at 6000 rpm (as
configured in the G55 AMG). The torque band equally impressive: at a mere 1500 rpm, the driver can elicit no less than
500 Nm of torque from the V8 engine, rising to 650 Nm at 2000 rpm and 690 Nm at 2500 rpm. The rev counter still only
displays 2650 rpm when maximum torque is reached: a massive 700 Nm.
The impressive power development in the eight-cylinder engine is largely due to a belt-driven supercharger enthroned between the cylinder banks. It works on the principal of a "Lysholm" compressor and achieves about 30 percent more charge pressure than other comparable belt-driven supercharging systems. The compressor screws - Teflon-coated aluminum castings - rotate at over 23,000 rpm (equivalent to an engine speed of 6500 rpm) and, in doing so, press 1850 kilograms of air per hour into the engine's combustion chambers. The maximum charge pressure is 0.8 bar.
On the basis of the engine speed and load, the engine management unit calculates whether to activate the screw-type compressor. With lightening speed, the electronic system actuates an electromagnetic clutch which drives the compressor by means of a separate poly-V-belt. The advantage of this direct link to the crankshaft is that the supercharger can spontaneously react when the driver presses the accelerator and provide powerful thrust at an engine speed barely above idle.
Besides the compressor, the supercharger module houses an intercooler between the cylinder banks. This charge air cooler operates as an air-to-water heat exchanger, extracting heat from the compressed air and transferring it to the coolant. A pump allows the water to flow through a special low-temperature cooler which is located in the cooling module, between the air-conditioning condenser and the radiator.
The actual water circuit in the 5.5-liter engine works independently of the low-temperature system for the charge air. An electrical suction-type fan uprated to 850 watts takes the greater cooling requirements of the supercharged engine into account. The oil cooling system is another example of the innovation shown by the AMG engineers: a separate oil cooler is installed in the front apron of the high-performance sports car, the warm air from which is channeled off upstream of the cooling module.
The AMG engineers' vast experience of designing high-performance engines for motorsport provided exceptional insight during development of the 5.5 Liter Kompressor powerplant. Te result? Another Engine of the Year Award for AMG's increasingly crowded trophy case. And an incredible experience for discerning drivers.
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© Marcus B. Fitzhugh 2005
Mercedes-Benz Specifications