6.3 AMG
The M156 is the first automobile V8 engine designed autonomously by Mercedes-Benz subsidiary Mercedes-AMG, as previous AMG engines have always been based on original Mercedes engines. The engine was designed to be a naturally aspirated racing unit, and is also used in a number of high-performance AMG-badged Mercedes-Benz models.
6.3 AMG
The M156 displaces 6,208 cc (6.2 L; 378.8 cu in) and shares very little with other Mercedes-Benz engine families like the M155. The bore spacing, block design, and other features are unique to the AMG engine.
Some of the main issues that linger in all M156 models consist of failure of the breather valve. The most common issue with the breather valve is that the diaphragm on the valve deteriorates over time. Another issue with the breather valve is that the hose from the crankcase to the valve also deteriorates and starts to crack. These issues can cause excess oil burning, heavy smoke from tail pipes and misfires. Other common issues are premature wear of engine lifters and camshafts as well as cam shaft adjusters. Common signs of this is a ticking noise at cold start of the vehicle. Other common issues consist of intake manifold failure, head bolt issues in models from 07 to 11 and drive belt pulleys.
The M159 is a version used in Mercedes-Benz SLS AMG and current AMG GT3 racecar. Compared to the standard AMG engine, the SLS's engine includes an all-new intake system, reworked valvetrain and camshafts, the use of flow-optimised tubular steel headers and dethrottling of the exhaust system. The engine also utilizes a dry-sump lubrication system to lower the center of gravity of the car.[3]
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An entire family of high-performance AMG models are powered by the first engine developed entirely by AMG. The naturally aspirated 6.3-liter V8 produces between 451 and 518 horsepower, depending on the model.
The V8-powered AMG model lineup featuring this engine includes the C63 AMG, E63 AMG and S63 AMG sedans; the CL63 AMG and CLS63 AMG coupes; the ML63 AMG sport utility vehicle and the SL63 AMG roadster.
Built almost completely from a high-strength silicon-aluminum alloy, the 6.3-liter features four valves per cylinder, variable valve timing, bucket followers (rather than rocker arms) and a variable-length intake manifold.
The connecting rods and lightweight pistons are matched for extremely close weight tolerances that contribute to smooth running at high speeds. Small nozzles in the engine block spray cooling oil onto the underside of each piston crown.
The cylinder bores feature a twin-wire-arc-sprayed (TWAS) coating, an innovative process that results in impressively low friction and running surfaces that are twice as hard as conventional cast-iron cylinders.
At relatively low engine speeds, intake air flows through long runners, which helps to maximize engine torque. At higher engine speeds, the flaps allow intake air to flow through shorter pipes for maximum high-speed horsepower.
Twin overhead camshafts in each cylinder bank open the 32 valves via bucket-type followers. In other words, instead of rocker arms, the cam lobes sweep across the flat tops of the buckets, which sit directly on top of the valve stems.
At part throttle, the valve timing adjuster keeps the exhaust valves open as the intake valves are opening, using this valve overlap to create internal exhaust gas recirculation, reducing exhaust emissions and improving fuel economy.
However, approaching full throttle, the camshaft adjustment optimizes valve timing for maximum power. The intake cams are driven by a double chain from the crankshaft, and small gears on the intake cams drive the exhaust camshafts.
A normally aspirated 355-hp version of this 5,439-cc V8 is used in the SLK55 AMG model. For these models, the AMG V8 engine makes easy work of the 0-60 mph test track sprint in 4.9 seconds for the SLK and 5.4 seconds for the G55 AMG.
The engine management unit determines whether to engage the supercharger depending on the engine speed and load. Under light loads, when the throttle is open only slightly, the Kompressor V8s operate purely as a naturally aspirated engine.
However, the supercharger goes into instant action when the driver accelerates. Under 2,700 rpm, the supercharger runs only when the throttle is open and the engine is under load, but above 2,700 rpm, the supercharger is engaged full-time.
To improve efficiency even further, an intercooler sits between the cylinder banks, operating as an air-to-water heat exchanger, extracting heat from the compressed air and transferring it to the coolant.
A dedicated pump allows the water to flow through a special low-temperature cooler located between the air conditioning condenser and the radiator, and this system works independently of the primary coolant circuit for the engine.
All four catalytic converters feature thin-wall ceramic material, and large surface area inside the ceramic element ensures low exhaust back pressure, benefiting both performance and exhaust emissions.
AMG has been the high-performance subsidiary of Daimler AG since 1999 and is located near Stuttgart in the country village of Affalterbach, Germany. AMG employs more than 600 specialists in development, production and administrative areas.
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.
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 GmbH to come up with a superlative new V8 power unit.
A mere glance at the key technical data shows that this has been achieved: 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 from 5200 rpm. The maximum engine speed is 7200 rpm.
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 naturally-aspirated, fast-running V8 engine in unmistakable audible and palpable form at low, medium and high engine speeds.
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.
In design terms the new eight-cylinder engine by Mercedes-AMG is the first completely autonomous development to have no features or shared parts 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 manifolds and the valve train; the bore/stroke ratio is also a completely new departure for Mercedes-AMG.
Other milestones in the history of AMG included the first four-valve V8 of 1984, which generated 250 kW/340 hp from a displacement of five litres, and the 6.0-litre eight-cylinder engine with 283 kW/385 hp.
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.
The same applied to the completely new AMG 6.3-litre V8 engine. The primary development goals for the engineers and product strategists at Mercedes-AMG GmbH were dynamic responsiveness, great agility, exhilarating liveliness and a high torque even at low engine speeds.
A glance at the key technical data shows that the aim of developing a naturally aspirated, fast-running V8 engine with a decidedly sporty character was achieved in full: the new AMG engine generates a maximum output of 375 kW/510 hp at 6800 rpm from a displacement of 6208 cubic centimetres.
These remarkable figures reflect the Mercedes-AMG philosophy of building powerful engines with superlative output and torque characteristics, combined with dynamic and immediate responsiveness, which will enable drivers to use a sporty style of driving to the full.
With its unique, sporty AMG sound which was designed during an extensive series of tests, the eight-cylinder unit from Affalterbach offers the excitement of a naturally-aspirated, fast-running V8 engine in unmistakable audible and palpable form at low, medium and high engine speeds.
In conceptual and design terms the new eight-cylinder powerplant by Mercedes-AMG is a completely autonomous development which shares no features or common parts with other eight-cylinder engines 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 completely new crankcase concept, the sophisticated intake and exhaust manifolds and the valve train.
More than three decades of know-how gained in GT and Touring Car championships, as well as great experience in the production of powerful, high-performance engines, went into the design of the new AMG 6.3-litre eight-cylinder engine. 041b061a72