The AMG 6.3-litre V8

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The world’s most powerful naturally aspirated V8 engine in terms of specific output and specific torque– made by Mercedes-AMG

Mercedes-AMG has broken completely new ground: the new AMG 6.3-litre V8 engine is the first in the world to combine a high-revving design with a large displacement. Developed entirely by AMG, this high-performance engine has a displacement of 6.3 litres and generates an output of 375 kW/510 hp at 6800 rpm with a maximum torque of 630 newton metres, which makes the new powerpack by AMG the world’s most powerful naturally aspirated V8 engine in terms of specific output and specific torque. Thanks to its large displacement, the V8 by AMG develops around 20 percent more torque than comparable naturally aspirated engines in this output class.

Made completely from high-strength aluminium, this naturally aspirated V8 engine has a wealth of exciting features derived from motorsport, and stands as an impressive reference to the successful motor racing history of AMG. Together with a variable intake manifold featuring two integral throttle flaps, the vertical arrangement of the intake and exhaust ducts ensures optimum cylinder charging. Bucket tappets in the cylinder heads allow a stiff valve train and therefore high engine speeds. Variable camshaft adjustment, a particularly rigid closed-deck crankcase and cylinder walls with a new, revolutionary LDS coating are further attributes of this ultra-modern Mercedes-AMG V8 engine.

This eight-cylinder unit was developed to series production maturity exclusively by the engineers and technicians in Affalterbach. The AMG 6.3-litre V8 engine is celebrating its premiere in the new Mercedes-Benz ML 63 AMG, and will subsequently ensure rousing and sporty driving pleasure in further AMG models.

The high expectations of AMG customers and the impressive history of AMG eight-cylinder engines were both an incentive and an obligation for the engineers and product planners at Mercedes-AMG to come up with a superlative new V8 power unit. A mere glance at the key technical data shows that they have fulfilled their mission. From a displacement of 6208 cubic centimetres, the AMG V8 aluminium engine develops a peak output 375 kW/510 hp at 6800 rpm and a maximum torque of 630 newton metres which is available at 5200 rpm. The maximum engine speed is 7200 rpm.

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Key figures at a glance:

Cylinder arrangement: V8
Cylinder angle: 90°
Valves per cylinder: 4
Displacement: 6208 cc
Bore/Stroke: 102.2/94.6 mm
Dist. Between cylinders: 109 mm
Compression ratio: 11.3 : 1
Output: 375 kW/510 hp at 6800 rpm
Power to volume ratio: 60.4 kW/82.1 hp
Max. torque: 630 Nm at 5200 rpm
Torque to volume ratio: 101.5 Nm
Max. engine speed: 7200 rpm
Weight (dry): 199 kg
Power to weight ratio: 1.88 kW/kg

This unique combination of a high-revving design with a large displacement offers the best of both worlds: exhilarating liveliness and high torque at low engine speeds. For the AMG driver the result is lively, ultra-spontaneous response. The high agility, the exciting, fast-revving characteristics and the high torque are very noticeable in all engine speed ranges. The new AMG V8 already delivers 500 newton metres to the crankshaft at 2000 rpm, and the maximum torque of 630 newton metres is available at 5200 rpm – figures which surpass those of any other naturally aspirated engine in this output and displacement class. In short, the new AMG eight-cylinder allows dynamic acceleration, rapid intermediate sprints and sheer driving pleasure at the highest level.
With its new, sporty AMG exhaust note which was designed during an extensive series of tests, the eight-cylinder unit from Affalterbach offers the excitement of a high-revving V8 engine in unmistakable audible and tangible form at low, medium and high engine speeds.

Unique variable intake manifold and revolutionary cylinder walls

Aside from the large overall displacement, the extremely high output and torque are due above all to the sophisticated intake system. Here, AMG has taken a completely new approach. The major characteristics of this system are large cross-sections, the streamlined design of the entire intake and exhaust tracts, and the vertical arrangement of all ducts in line with the practice in the field of motorsport. Built from magnesium, the newly developed and patented variable intake manifold, which has two parallel-action internal throttle flaps, is a world first. Owing to the short distances between the throttle flaps and the combustion chambers, the combined action of these components, which are highly unusual in regular engine production, ensures dynamic responsiveness and optimum cylinder charging.

Revolutionary LDS-coated cylinder walls

The 32 valves in the cylinder heads are operated by bucket tappets, which allow stiff valve guidance and therefore high engine speeds. This is a familiar and very successful technology adopted from motor racing. Continuous adjustment of the camshafts on both the intake and exhaust sides is another special feature of this ultra-modern AMG V8 engine. The interior of this powerful new unit features a genuine world first: the AMG 6.3-litre V8 engine is the very first series production engine to feature a special LDS coating (twin wire arc spraying) on the cylinder walls, a new process which produces optimum low-friction characteristics.

Motor racing genes are recognisable in the crankcase, too: 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.

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Completely independent development from Affalterbach

In design terms the new eight-cylinder engine by Mercedes-AMG is the first completely autonomous development, with no characteristics or components whatsoever in common with other eight-cylinder units by Mercedes-Benz. The new 6.3-litre unit differs from the other AMG V8 engines based on Mercedes designs in the distance between cylinders, the crankcase concept, the sophisticated intake and exhaust tracts and the valve train; the bore/stroke ratio is also a completely new departure for Mercedes-AMG.

The new powerpack is produced at the ultra-modern AMG engine facility, according to the “one man, one engine” philosophy. This means that a single specialist assembles the complete engine by hand. To reflect this, the engine’s AMG badge bears the specialist’s signature.

Successful history of high-performance AMG engines

AMG engines have always been in a class of their own. The first highlight was the 6.8-litre, 309 kW/420 hp V8 racing engine in the legendary 300 SEL 6.8 AMG of 1971. At its first participation in the 24-hour race in Spa-Francorchamps this speedy Mercedes saloon secured a highly acclaimed class victory and took second place overall. Other milestones in the history of AMG included the first four-valve V8 (built in 1984), which generated 250 kW/340 hp from a displacement of five litres, and the 6.0-litre eight-cylinder unit with 283 kW/385 hp. The 368 kW/500 hp 5.5-litre, supercharged V8 engine in the SL 55 AMG, the supercharged AMG V8 engine generating 460 kW/626 hp in the Mercedes-Benz SLR McLaren and the AMG V12 biturbo engine with an output of 450 kW/612 hp and 1000 newton metres of torque are further highlights in the history of AMG engine technology.

In 2003 and 2004, the AMG 5.5-litre supercharged V8 and the AMG 6.0-litre V12 biturbo engine took first place against well-known competitors in the “Best Performance Engines” category of the “Engine of the Year Awards”.

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