The new generation SL: Sportier than ever
Mar 10, 2008
AMG 6.3-litre V8 engine: High-revving design plus large displacement: naturally aspirated V8 made by Mercedes-AMG
  • AMG 6.3-litre V8 engine with thoroughbred motorsport technology
  • Innovative TWAS coating on the cylinder walls
  • AMG sports exhaust system for typical AMG eight-cylinder vocals
  • Large coolers for optimal sustained performance
  • Powerful V8 engines as an AMG tradition
The new Mercedes-Benz SL 63 AMG is powered by the most muscular version of the AMG 6.3-litre V8 engine introduced in 2005. As in the high-performance S 63 AMG and CL 63 AMG, this state-of-the-art eight-cylinder power unit delivers an output of 386 kW/525 hp at 6800 rpm and a maximum torque of 630 Newton metres in the Roadster. Thanks to its large displacement of 6208 cubic centimetres, this completely in-house development by AMG generates around 20 percent more torque than comparable naturally aspirated engines in this performance class.
The AMG 6.3-litre V8 engine uniquely combines a high-revving design with a large displacement, obtaining the best of both worlds: exhilarating liveliness accompanied by a high torque at low engine speeds. The driver of the SL 63 AMG experiences the decidedly sporty character of the engine in the form of great agility and dynamic responsiveness in all engine speed ranges. The AMG V8 already delivers 500 Newton metres to the crankshaft at 2000 rpm, while the maximum of 630 Newton metres is on tap at 5200 rpm – more than any other naturally aspirated engine in this output and displacement class. In short, the AMG eight-cylinder unit guarantees dynamic acceleration, rapid intermediate sprints and sheer driving pleasure at the highest level.
With its sporty AMG exhaust note which was designed during an extensive series of tests, the eight-cylinder unit from Affalterbach offers the excitement of a naturally-aspirated, high-revving V8 engine in unmistakable audible and tangible form at low, medium and high engine speeds. The SL 63 AMG accelerates from zero to 100 km/h in 4.6 seconds, and has a top speed of 250 km/h (electronically limited).
Key data at a glance:
Cylinder arrangement/ valves per cylinder
V8/ 4
Cylinder angle
Bore x strokemm
102.2 x 94.6
Distance between cylinders
Compression ratio
11.3 : 1
Output at
kW/hp rpm
386/525 6800
Output per litre
Max. torqu at
Nm rpm
630 5200
Torque per litre
Max. engine speed
Engine weight (dry)
Power/weight ratio
Fuel consumption combined
l/100 km
Acceleration 0-100 km/h
Max. speed
*Electronically limited
Technology transfer from motorsport
Made completely from high-strength aluminium, this naturally-aspirated V8 engine has a wealth of exciting features derived from motorsport, and impressively documents the successful motor racing history of AMG. Apart from the large overall displacement, the extremely high output and torque are above all due to the sophisticated intake system. Its major characteristics are large cross-sections, the streamlined design of the entire intake and exhaust tract, and the vertical arrangement of all ducts in line with motor racing practice. The patented variable intake manifold of magnesium, which has two parallel-action internal throttle flaps, is a world first. The combined action of these components, which are highly unusual in regular engine production, ensures excellent cylinder charging thanks to the short distances between the throttle flaps and the combustion chambers.
Innovative TWAS coating on the cylinder walls
The 32 valves in the cylinder heads are operated by bucket tappets for a rigid valve train and high engine speeds – a technology which has proved its worth in motor racing. Continuous adjustment of the camshafts on the intake and exhaust sides ensures that the eight combustion chambers are optimally supplied with the fuel/air mix. The interior of the AMG 6.3-litre V8 conceals yet another genuine world first, however: it is the world’s first regular production engine to feature a special TWAS (twin wire arc sprayed) coating on the cylinder walls, a new process which produces outstandingly low friction.
Motor racing genes are once again obvious in the crankcase: as in the supercharged AMG V8 engine for the Mercedes-Benz SLR McLaren, the engineers and technicians opted for a particularly rigid bedplate design with closed-deck technology. Special, cast-in steel components ensure even more rigidity, a reliable oil supply in all day-to-day operating situations and optimal long-term durability.
Electronically controlled fuel supply for great agility
The breathtaking agility and responsiveness of the V8 engine to movements of the accelerator is also due to the electronically controlled fuel supply. Featuring newly developed components, the system operates at a demand-responsive pressure of 3.8 to 5.0 bar. The fuel pressure is variably and instantly adjusted depending on the performance requirement and ambient temperature. The engine electronics execute commands from the accelerator pedal within milliseconds, leading to outstanding responsiveness and sporty overrun characteristics in all load and engine speed ranges.
For optimal sustained performance the SL 63 AMG is equipped with a particularly efficient water cooling system as well as large engine and transmission oil coolers. Located behind the apertures in the AMG front apron, these coolers guarantee non-critical operating temperatures at all times – even under the toughest conditions on the racetrack. TheAMG sports exhaust system with two chrome-plated, oval twin tailpipes is responsible for the characteristic eight-cylinder sound – whether the Vario-roof is open or closed. The tri-metallic coating used in the catalytic converters results in a faster response from a cold start, more efficient emission control as well as superior long-term durability. The SL 63 AMG fulfils all standard exhaust emissions limits such as EU 4 and the specific requirements of the U.S. market (LEV-II, On-Board Diagnosis II and oxygen sensor diagnosis).
Completely in-house development from Affalterbach
In design terms the eight-cylinder from Mercedes-AMG is a completely in-house development which has no characteristics or shared components in common with other eight-cylinder units from Mercedes-Benz. The 6.3-litre unit differs from previous AMG V8 engines in its bore/stroke ratio, the distance between cylinders, the crankcase concept, the sophisticated intake and exhaust tract and the valve train
Engines are traditionally hand-assembled at Mercedes-AMG – and this also applies to the AMG 6.3-litre V8 of the new SL 63 AMG. In the ultra-modern AMG engine workshops opened in 2002 , a single technician assembles the complete engine by hand according to the "one man, one engine" philosophy, and according to the most stringent quality standards – as witness his signature on the engine’s AMG badge.
Successful history of high-performance AMG V8 engines
AMG V8 engines have always been in a class of their own. The first highlight in the company’s history was the 6.8-litre, 309 kW/ 420 hp V8 racing engine in the legendary 300 SEL 6.8 AMG of 1971. At the 24-hour race in Spa-Francorchamps this fast Mercedes saloon immediately secured a highly acclaimed class victory and second place overall. Other milestones in the history of AMG include the first four-valve V8 of 1984, which generated 250 kW/340 hp from a displacement of five litres, the 6.0-litre eight-cylinder with 283 kW/385 hp and the supercharged AMG 5.5-litre V8 of the SLR McLaren, with a peak output of up to 478 kW/650 hp.
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