2012 Mercedes-Benz SLK55 AMG: official details, photos, specs and price

Article by Christian Andrei, on August 24, 2011

Mercedes-Benz is preparing to launch the SLK roadster for 2012, considered to be the most powerful version of the sports car. The SLK gets an AMG trim and the SLK’s look is made more attractive with a series of enhancements. The SLK will also be getting 415hp from its naturally aspirated V8, from 355hp in the existing model. U.S. dealerships will start to receive the 2012 SLK in early 2012. It is reinforced further with an AMG suspension and high-performance brakes.

The athletic ethos is also evident in the spoiler, body treatments and chrome tailpipes. The roadster will enable the eight cylinders propel the car to 60 mph in 4.5 seconds en route to an electronically limited top speed of 155 mph. Its torque rating is at 398 lb-ft.

The engine is fitted with a cylinder-deactivation setup, enabling the roadster to be driven on four cylinders.

The powertrain features a seven-speed automatic, which Mercedes refers to as Speedshift. There are three modes for it: controlled efficiency, sport and manual.

Mercedes-Benz said that the AMG performance pack is being offered as an option. It features an even stiffer chassis, rear-axle differential lock and upgraded brakes. Its impressive design cues include specific AMG LEDs, a front apron and special badges.

Exterior Design

While its proportions follow the ones observed in a standard roadster characteristic of the AMG design, it also provides clues to the qualities of the SLS AMG.

The 2012 Mercedes-Benz SLK55 AMG has a long hood that follows the usual shape with the greenhouse located to its rear and the sharp rear section. Designers made sure to complement this with the usual AMG styles at its rear, side, and front. In addition to the large air inlets, the front apron is also where the LED daytime running lights, specific to the AMG, are housed. Founded on the SLS AMG, in the middle of the radiator grille stands the large Mercedes star.

Specific to the SLK55 AMG, the slats located in the front apron as well as the lower cross strut have a high-gloss black paint finish. Both the clear-lens headlamps and the bi-color tail lamps have been darkened, though these are typically standard on higher V8 model range.

Made available as an option are the Bi-Xenon headlights fitted with the Active Curve Illumination. Meanwhile the front fenders have the vent grilles whose fins are chrome-plated and bring to mind not only the SLS AMG but also the 1950 Mercedes-Benz 300 SL Roadster.

While the 2012 SLK55 AMG is indeed part of the SLK series, what makes this 8-cylinder unit unique from the rest is the "V8 AMG" lettering that is just under the grilles. The side sill panels have a unique style and follow the design of its front apron and all the way to the rear apron. The rear apron sports a distinct shape and with the two twin tailpipes of its sports exhaust system being chrome-plated and the black diffuser insert having three fins, it completes that unique touch to this model.

Its trunk lid has a spoiler lip that has the same color of the body and allows the lift at its rear axle to be lowered. As such, it can enhance the driving stability even when running at higher speeds. One interesting feature of the 2012 SLK55 AMG is the retractable roof.

By simply pressing a button and waiting 20 seconds, this closed-top Coupe converts to an open-top Roadster. Mercedes-Benz though is offering customers the chance to have the panorama roof panel in a polycarbonate tint. However that’s not all as there is a third option which will be introduced in this new model and this is the panorama roof equipped with the MAGIC SKY CONTROL. What this does is by the touch of a button, the roof can be converted from dark or light.

Under the former, the roof gives the occupants that needed shade and even avoids the sun to heat the interior. For the light portion, the roof becomes almost transparent and gives a feeling of open air even under cold weather. Regardless of what roof variant is chosen, of all of the frames will be composed of magnesium. Because of this, it is lighter by 13 pounds when compared to the prior model.

It even results in the 2012 SLK55 AMG having a lowered center of gravity and thus enhances the agility. While it has the standard wind-stop, the pivoting AIRGUIDE wind-stop is offered as an option. This new feature comes with pivoting plastic wings, which are transparent, and fitted at the rear of its rollover bars. The biggest benefit of this is that no installation is needed.

Interior Design

The design of the 2012 Mercedes-Benz SLK55 AMG can be described as high-quality, displaying top style and full functions. Even then it still brings to mind the SLS AMG Roadster. Proof of this are the four air vents, which are styled similarly to jet engines, and the center console with brush aluminum finish. The AMG instrument cluster houses the AMG main menu, the unique dials, and the four circle-shaped instruments.

It has even been placed in a position so as to allow the driver to have a perfect field of vision. Meanwhile the center console is where the button that controls the C, S, and M, transmission modes are located. In the center of the dashboard meanwhile is the analog clock that is specific to the AMG and has the IWC design.

While the grip areas and the aluminum shift paddles have a perforated leather finish, the AMG Performance steering wheel has a metal trim with its top and bottom portions being flattened. Its sport seats are able to offer optimized lateral support and upholstered in premium leather. The backrests carry the AMG badge and it even has the neck-level AIRSCARF heating system.

Press Release

2012 Mercedes-Benz SLK55 AMG

The 2012 Mercedes-Benz SLK55 AMG is the most powerful SLK of all time. Its new AMG 5.5-liter V8 engine featuring cylinder shutoff combines the ultimate in performance with the lowest possible fuel consumption. With a peak output of 415 hp and maximum torque of 398 lb-ft, the 2012 SLK55 AMG is poised to outperform all of its direct competitors. High-performance driving is ensured thanks to the AMG sports suspension with Direct-Steer system, Torque Vectoring Brakes and 3-stage ESP®, as well as the AMG high-performance braking system. The 2012 SLK55 AMG will arrive in U.S. showrooms in early 2012.

Forming part of the third-generation of the SLK launched in June 2011, the new AMG model catches the eye at first glance: distinctive AMG light-alloy wheels, exclusive AMG body styling with AMG spoiler lip and two chrome-plated twin tailpipes at the rear complement the classic roadster proportions, while adding a distinct athletic touch. The expressive design of the 2012 Mercedes-Benz SLK55 AMG is both eye-catching and unmistakable.

The Mercedes-Benz SLK55 AMG is the perfect embodiment of the new AMG brand claim of "Driving Performance": in the compact high-performance Roadster segment there is nothing to compare to its combination of tangible driving dynamics, superior sportiness, unique high-technology and low fuel consumption. The SLK55 AMG accelerates from zero to 60 mph in 4.5 seconds, and reaches a top speed of 155 mph (electronically limited).

Helping to set new fuel efficiency standards for V8's, the 5.5 liter engine combines low consumption figures with superior power delivery and the typical exhaust growl which only a large-displacement eight-cylinder engine can produce.

In line with its "AMG Performance 2015" strategy, the new V8 engine continues to reduce both the fuel consumption and emissions of new models over the next few years - while reaching new heights with the central brand claim of "Driving Performance". At the same time, AMG is also demonstrating its social responsibility with the M152 engine.

New naturally aspirated eight-cylinder closely related to the V8 biturbo

The new M152 is based on the AMG M157 5.5-liter V8 biturbo engine presented in 2010, which powers the E63 AMG, CLS63 AMG, S63 AMG and CL63 AMG. Numerous design features are identical, such as the displacement, bore/stroke, distance between cylinders, ECO stop/start system and direct gasoline injection technology. Distinguishing features versus the M157 include the new intake air ducting, new cylinder heads, the modified valve drive, an adapted oil supply system and an optimized crankcase.

Exclusive combination of advanced technologies

The high-tech M152 motor dazzles with a combination of advanced technologies which is unequalled anywhere in the world. No other gasoline engine features direct injection at a pressure of 2,900 psi, spray-guided combustion and piezo injectors, all in conjunction with map-controlled cylinder shut-off, an all-aluminum crankcase with "spectacle" honing, fourvalve technology with continuous camshaft adjustment, a high compression ratio of 12.6:1, a stop/start system and generator management - while revving to a maximum speed of over 7,000 rpm. All of these features lead to high thermodynamic efficiency which is essential for high fuel efficiency and low exhaust emissions. Using a large-displacement, naturally-aspirated eight-cylinder engine with cylinder shut-off resolves the trade-off between high output/torque delivery and low fuel consumption figures.

AMG Cylinder Management

The AMG Cylinder Management cylinder shut-off system - developed completely by Mercedes-AMG - significantly improves efficiency: cylinders two, three, five and eight are cut off under partial load, which lowers fuel consumption considerably. In similar form, this technology is also used in the 750-hp V8 engines used in Formula 1. As efficiency also plays a major role at the pinnacle of motor racing, two or four of the eight cylinders are cut off e.g. when cornering at slow speed, during Safety Car laps or for pit stops.

The cylinder shut-off function is available over a wide engine speed range from 800 to 3,600 rpm if the driver has selected transmission mode "C" - Controlled Efficiency. The AMG main menu in the instrument cluster informs the driver whether cylinder shut-off is active, and whether the engine is currently running in four or eight-cylinder mode. No less than 170 lb-ft of torque is still available in four-cylinder mode - enough power to ensure plenty of acceleration in most driving situations. As soon as the driver has a need for more power and leaves the partial load range, cylinders two, three, five and eight are activated. The switch from four to eight-cylinder operation is immediate and imperceptible, leading to no loss of occupant comfort. At an engine speed of 3,600 rpm the activation process takes no more than 30 milliseconds.

Valves closed, fuel delivery and ignition deactivated

Cylinder shut-off is made possible by the intelligent engine management system, with 16 hydraulically compensating actuators and a sophisticated oil supply system in the cylinder head. The compensating actuators are integrated into the cylinder head, and keep the intake and exhaust valves of cylinders two, three, five and eight closed when cylinder shut-off is active. At the same time their fuel supply and ignition are deactivated. This not only enables the loadchange losses of the four deactivated cylinders to be reduced, but also increases the efficiency of the four remaining cylinders. This is because the operating point is transferred to the higher load range. The actuators are compact and lightweight, allowing taut valve train operation and engine speeds up to 7,200 rpm.

All-aluminum crankcase with Silitec cylinder liners

The crankcase of the new AMG 5.5-liter V8 engine features a diecast allaluminum construction. The low (dry) engine weight of just 412 lbs is the result of uncompromising lightweight construction methods. The bearing covers for the main crankshaft bearings are grey cast iron, and are bolted to the crankcase, as well as on the sides, for high rigidity.

The piston rings are carbon-coated to minimize internal friction and reduce wear. Cast-in Silitec cylinder liners ensure low friction for the eight pistons. Unique "Spectacle" honing is another measure to reduce friction and therefore fuel consumption: in this sophisticated and complex process, the cylinder liners receive their mechanical surface treatment when already bolted in place. As honing would no longer be possible with the cylinder head installed, a jig resembling spectacles is bolted to the crankcase. The cylinder liners distort as if the cylinder head were in place, and are only then given their mechanical surface treatment. As a result, any static distortion of the cylinder liners caused by tightening the cylinder head bolts can be completely eliminated.

Other measures to optimize efficiency:

weight-optimized cast aluminum pistons with special piston skirt coating
special ventilation holes in the crankcase
oil pump with electrically controlled pressure stage
separate oil pump for cylinder shut-off as a controllable, low-friction vane cell pump
engine cooling using especially efficient cross-flow principle
electronically controlled fuel pressure, fully variable and demand-related between 1,450 and 2,900 psi
The forged crankshaft of high-grade 38MnS6BY steel alloy rotates in five main bearings, has eight counterweights and has been optimized with respect to torsional rigidity, inertia, low rotating masses and a long operating life. A twomass viscous damper mounted at the front reliably eliminates vibrations. Each connecting rod journal on the crankshaft carries two forged, cracked connecting rods.

Four-valve technology with variable camshaft adjustment

Perfect charging of the combustion chambers is provided by large intake and exhaust valves, four per cylinder. The exhaust valves, which are subject to high thermal loads, are hollow and sodium-cooled. Four overhead camshafts operate the 32 valves via low-maintenance, low-friction cam followers. The infinitely variable camshaft adjustment within a range of 40 degrees on the intake and exhaust sides adapts to engine load and engine speed, leading to high output and torque values. This also provides consistent idling at a low speed. Depending on the engine speed, valve overlap can be varied for the best possible fuel/air supply to the combustion chambers and efficient removal of the exhaust gases. The variable camshaft adjustment is carried out hydraulically via four pivoting actuators. These are electromagnetically activated and controlled by the engine control unit. The camshafts are driven by three high-performance silent chains, which have considerable advantages in terms of noise comfort compared with cylinder roller chains.

Controlled Efficiency stop/start function as standard

The Controlled Efficiency stop/start function further contributes to the low fuel consumption. This system is standard equipment on the Mercedes-Benz SLK55 AMG and active in the fuel economy transmission mode "C". Once the driver brakes to a stop e.g. at a red traffic light, the V8 engine is automatically switched off. Once the brake pedal is released or the accelerator is depressed, the engine is immediately restarted and the car is able to move off quickly. Intelligent technology provides a comfortable and immediate starting procedure: a crankshaft sensor recognizes the direction of rotation and registers the resting position of all eight pistons. For an automatic engine start, the cylinder with the most favorable piston position receives an injection of fuel into its combustion chamber. The precise piezo-electric injectors greatly assist this process, as they make especially fast starts possible. The M152 always starts in eight-cylinder operation.

A framed "ECO" symbol in the AMG main menu shows the driver that the Controlled Efficiency stop/start function is active. When cylinder shut-off is active, the driver is informed by the symbol "ECO4", while "ECO8" stands for eight-cylinder operation. In the two more performance-oriented driving modes "S" (Sport) and "M" (Manual), the stop/start function is always deactivated. If required, the driver can also switch it off while in "C" mode as well. In this case neither a "stop/start" nor an "ECO" symbol appears.

Alternator management helps to save fuel

An alternator management system makes a further contribution to fuel economy: whenever the V8 engine is in overrun or when braking, kinetic energy is used to charge the battery rather than wasted as heat. In all other operating modes a combination of onboard network and alternator management enables the electrical system to be kept at a low voltage.

New AMG sports exhaust system with integrated exhaust flaps

AMG is premiering a new sports exhaust system featuring an exhaust flap on each side. This technology resolves the trade off between an emotional exhaust note during spirited driving and a more discreet engine sound in the partial load range. The main focus of the sound design was to achieve a perfect synthesis of perceptible performance and the long-distance comfort that is a hallmark of Mercedes.

Each of the two rear silencers has a flap which is variably activated on a logiccontrolled basis depending on the driver's power requirement and the engine speed. At low loads and engine speeds below 2,000 rpm the flaps remain closed. This causes the exhaust gases to cover a longer distance and flow through an additional damping element, so that the engine sound is pleasantly subdued and disruptive frequencies are effectively suppressed - resulting in a mellow tone especially in four-cylinder operation when cylinder shut-off is active.

When the driver accelerates, the flaps open at an angle of 15, then 30 and up to 50 degrees so that some of the exhaust gases cover a short distance while the remaining follow the longer, acoustically dampened path producing a sonorous engine note. Under full load at higher engine speeds in eight-cylinder mode, both flaps are fully opened so that the occupants are able to enjoy the distinct muscular sound typical of an AMG V8. This emphasizes the performance potential of the 415 hp naturally aspirated AMG eight-cylinder engine.

The two-pipe AMG sports exhaust system with two chromed twin tailpipes has a pipe diameter of 2.56 inches from the manifolds to the pre-silencer. The diameter is reduced to 2.36 inches from the pre-silencer to the rear silencers.

Effective emissions technology with new catalytic converter boxes

Low exhaust emissions, compliance with country-specific standards and a characteristic engine sound - the requirements for the exhaust system of the new, naturally aspirated AMG 5.5-liter V8 engine were multiple and complex. The 2012 SLK55 AMG complies with the current Euro-5 emission standard, as well as meeting all the requirements of the US market (LEV-III standard, On- Board Diagnosis II).

Air gap-insulated manifolds ensure a rapid catalytic converter response. For efficiency and to save space, this design has a tandem catalytic converter housing on each side of the vehicle: adjacent to the firewall, two thin-walled ceramic substrates are grouped into each housing. This setup makes the previous, additional underbody catalytic converters unnecessary. The two ceramic substrates differ to ensure rapid and efficient emissions control: the front one is coated with palladium, while the rear one has a bimetal coating of palladium and rhodium. One lambda sensor per row of cylinders is located in front of each catalytic converter housing, and there is a lambda diagnostic sensor between each of the two thin-walled substrates.

Highly variable: the AMG SPEEDSHIFT PLUS 7G-TRONIC

Power is transferred to the rear wheels by means of the AMG SPEEDSHIFT PLUS 7G-TRONIC automatic transmission which features three transmission modes: "Controlled Efficiency" (C), Sport (S) and Manual (M). The automatic rev-matching function when downshifting as well as the brief, precisely defined interruption of ignition and injection when upshifting under full load shorten shift times and increase emotional appeal. A double turbine torsional damper with centrifugal pendulum adapts to engine speed and helps minimize vibrations in four-cylinder operation as well as enhances comfort.

Perfect combination: highly expressive driving style and comfortable cruising

The AMG sports suspension with Torque Vectoring Brakes and AMG Direct- Steer system provides both impressive lateral dynamics as well as agile handling. Looking for a highly aggressive driving style or comfortable cruising? The new Mercedes-Benz SLK55 AMG is able to offer both. Independent suspension struts with stiffer spring/damper tuning, torque strut bearings on the front axle featuring higher rigidity, stiffer stabilizers at all four corners as well as a more negative camber on the rear axle result in high cornering speeds and low body roll in fast S-shaped bends.

In critical cornering conditions, the Torque Vectoring Brakes produce a defined rotational movement of the vehicle about the vertical axis in fractions of seconds, through selective brake actuation at the rear wheel on the inside of the bend. This results in the SLK55 AMG steering into the turn precisely and under full control, without any compromises where performance is concerned. Complementing this feature is the AMG Direct-Steer system which enhances handling and agility compared with the standard steering, while also reducing the amount of physical effort required when parking. A new power steering pump helps to reduce fuel consumption by using energy only when the driver is actually steering. In addition, the AMG Direct-Steer system has a parameter function adapted to match the AMG sports suspension. This results in optimum response from the central position, outstanding road feel and sharp handling in all driving situations.

The AMG-exclusive 3-stage ESP® gives individual control choices at the touch of a button: the ESP® button in the center console allows the driver to choose between "ESP ON", "SPORT Handling Mode" and "ESP OFF". The AMG highperformance brake system has internally ventilated and perforated brake discs on all wheels, measuring 14.2 in. x 1.4 in. at the front and 13 in. x .9 in. at the rear. The system is characterized by outstanding responsiveness, short stopping distances and excellent fatigue resistance.

Optional AMG Handling Package for even greater driving dynamics

The optionally available AMG Handling Package enhances the vehicle's sportiness even further. It comprises an AMG Performance suspension with stiffer tuning, an AMG rear axle differential lock, two-piece brake discs at the front and a three-spoke AMG Performance steering wheel finished in premium leather with Alcantara® inserts in the grip areas.

Unmistakable: uniquely styled design and appointments

Classic roadster proportions with typical AMG design characteristics as well as a hint of the SLS AMG -are striking visual highlights of the 2012 Mercedes-Benz SLK55 AMG. The AMG designers have complemented the exciting basic forms of the long hood, the greenhouse positioned well to the rear and crisp rear section with typical AMG styling at the front, sides and rear. The new AMG front apron has large air inlets and AMG-specific LED daytime running lights. Inspired by the SLS AMG super sports car, the wide radiator grill features a large, centrally-positioned Mercedes star. In the case of the SLK55 AMG, the slats in the front apron and the lower cross strut are painted in a high-gloss black finish. Darkened clear-lens headlamps and darkened bicolor tail lamps also come as standard exclusively on the top-of-the-range V8 model. Bi-Xenon headlights with Active Curve Illumination are also available as an optional extra.

The vent grilles with chrome-plated fins in the front fenders are not only reminiscent of the SLS AMG, but also evoke memories of the famous Mercedes-Benz 300 SL Roadster from the 1950s. The "V8 AMG" lettering beneath the grilles highlight the top-of-the-range eight-cylinder model from the rest of the SLK model series. AMG-specific, distinctively styled side sill panels continue the design of the front apron through to the new rear apron. With its own unique shape, black diffuser insert with three fins as well as the two chromeplated twin tailpipes of the AMG sports exhaust system, it gives a distinctive finishing touch to the vehicle. The spoiler lip on the trunk lid, painted in the vehicle body color, reduces lift at the rear axle and thereby increases driving stability at high speeds.

Inspired by the SLS AMG: high-quality, stylish interior

Functional, stylish, high-quality: the interior design of the Mercedes-Benz SLK55 AMG is also reminiscent of its bigger brother, the SLS AMG Roadster. Associations with the super sports car are evoked courtesy of the four air vents in the style of jet engines, as well as the center console finished in brushed aluminum. Placed in the center of the dashboard is an AMG-specific analog clock featuring an IWC design. The AMG Performance steering wheel, with its flattened top and bottom sections, also boasts metal trim, aluminum shift paddles and grip areas finished in perforated leather. The clearly-arranged AMG instrument cluster is positioned perfectly in the driver's field of vision and features four circular instruments, distinctive dials and the AMG main menu. The button for the transmission modes C, S and M is also located in the center console.

The AMG sports seats feature optimized lateral support and premium leather upholstery with AMG badges in the backrests and standard AIRSCARF necklevel heating system.

Magical: the panorama roof with MAGIC SKY CONTROL

The standard retractable hardtop opens and closes in less than 20 seconds, transforming the open-top Roadster into a closed-top Coupe with rigid roof at the touch of a button. Alternatively, a panorama roof panel in tinted polycarbonate can also be chosen. The third variant is a world premiere - the panorama roof with MAGIC SKY CONTROL. This glass roof switches to light or dark as required at the press of a button. When activated it is virtually transparent, offering an open-air experience even in cold weather. In its dark state the roof provides welcome shade and prevents the interior from heating up from the sun's intense rays. In other words: a comfortable atmosphere at the touch of a button.

The frames of the three roof variants are made of magnesium. This makes each roof around 13 lbs lighter than in the previous model, giving the car a lower center of gravity - which benefits its agility. A comfortable alternative to the standard wind-stop is the new AIRGUIDE pivoting wind-stop. It consists of pivoting transparent plastic wings which are attached to the back of the rollover bars. The advantage: no installation or removal effort required.

Exceptional position: modern assistance systems on board

The 2012 SLK55 AMG sets new standards when it comes to safety: a whole host of the latest assistance systems support the driver and help secure the new AMG Roadster's exceptional position in its segment. Standard equipment includes new, fiber-reinforced roll-over bar, two-stage driver and front passenger airbags, headbags, thorax airbags, knee airbags, seat belt tensioner with belt force limiters, NECK-PRO crash-active head restraints, three-stage ESP® and also ATTENTION ASSIST drowsiness detection.

Further assistance systems are available on request:

DISTRONIC PLUS: this proximity control system automatically maintains a set distance from the vehicle ahead, braking the Mercedes-Benz SLK55 AMG to a stop if necessary and also accelerating the Roadster again.
The PRE-SAFE® Brake detects the acute danger of a rear-end collision and prepares for autonomous braking. The system is active at speeds of between 19 and 124 mph when moving vehicles are detected in front of the car.
Three generations: the SLK made by AMG

The 2012 SLK55 AMG is already the third generation of the exclusively dynamic Roadster model made by AMG. It all started in 2001 with the SLK32 AMG. Its supercharged AMG V6 engine with a displacement of 3.2 liters produced 349 hp and maximum torque 332 lb-ft - as such, the SLK32 AMG was the most powerful vehicle among the competition.

At the end of 2004 this was followed by the Mercedes-Benz SLK55 AMG. With its AMG 5.5-liter V8 engine, which developed 355 hp and 376 lb-ft of torque, it also took the lead in its segment. No other vehicle in this class offers a large-displacement eightcylinder engine - and Mercedes-AMG has remained consistently true to this philosophy with the successor model. The new 2012 SLK55 AMG will celebrate its U.S. market launch in early 2012.

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