The 2012 Mercedes-Benz SLK55 AMG marked a significant leap forward for the iconic SLK roadster, delivering unprecedented power and efficiency. As the most potent SLK variant to date, this model year showcased a revolutionary AMG 5.5-liter V8 engine equipped with cylinder shutoff technology. This innovation allowed the Mercedes Benz Amg 2012 to masterfully blend exhilarating performance with a surprising degree of fuel economy, setting a new benchmark in its class. With an impressive 415 horsepower and 398 lb-ft of torque at its command, the SLK55 AMG was engineered to surpass its rivals in every measure of driving dynamism. Complementing this raw power was the meticulously tuned AMG sports suspension, featuring a Direct-Steer system, Torque Vectoring Brakes, and 3-stage ESP®, all working in harmony with the AMG high-performance braking system to ensure exceptional handling and control. The arrival of the mercedes benz amg 2012 in dealerships in early 2012 heralded a new era of performance roadsters.
Athletic Elegance: The Exterior Design of the 2012 SLK55 AMG
As part of the third generation SLK family introduced in June, the mercedes benz amg 2012 immediately commands attention with its striking aesthetics. Distinctive AMG light-alloy wheels and exclusive AMG body styling immediately set it apart. The inclusion of an AMG spoiler lip and two chrome-plated twin tailpipes at the rear not only emphasize the classic roadster silhouette but also inject a bold, athletic character.
AMG light-alloy wheels enhance the sporty profile of the 2012 Mercedes-Benz SLK55 AMG.
The expressive design language of the mercedes benz amg 2012 is both captivating and instantly recognizable. It successfully merges the inherent elegance of the SLK roadster with the aggressive and dynamic cues synonymous with the AMG brand. The result is a vehicle that is as visually arresting as it is thrilling to drive.
“Driving Performance” Embodied: The Performance Prowess of the 2012 SLK55 AMG
The mercedes benz amg 2012 SLK55 AMG stands as a perfect embodiment of AMG’s core philosophy: “Driving Performance.” Within the realm of compact, high-performance roadsters, no other vehicle at the time could rival its fusion of tangible driving dynamics, superior sportiness, cutting-edge technology, and surprisingly efficient fuel consumption. The raw performance figures speak volumes: the SLK55 AMG accelerates from 0 to 60 mph in a mere 4.5 seconds. Its top speed is electronically limited to 155 mph, underscoring its focus on controlled yet exhilarating power delivery.
The speed and agility of the 2012 Mercedes-Benz SLK55 AMG are showcased on a winding road.
This impressive performance is not just about straight-line speed. The mercedes benz amg 2012 was engineered to deliver a holistic driving experience, where power is seamlessly integrated with agile handling and responsive control. It represents a harmonious blend of raw power and refined engineering, creating a driving experience that is both thrilling and rewarding.
The Heart of the Beast: Unveiling the 5.5-Liter V8 Engine in the 2012 SLK55 AMG
At the heart of the mercedes benz amg 2012 SLK55 AMG lies the groundbreaking AMG 5.5-liter V8 engine. This powerplant is not just about brute force; it represents a sophisticated approach to performance engineering. Setting new standards for V8 fuel efficiency, this engine masterfully combines reduced fuel consumption with potent power delivery and the unmistakable, deep growl that only a large-displacement eight-cylinder engine can produce.
| Specification | Value |
|---|---|
| Displacement | 5,461 cc |
| Bore x Stroke | 3.86 in x 3.56 in |
| Compression Ratio | 12.6 : 1 |
| Output | 415 hp @ 6,800 rpm |
| Max. Torque | 398 lb-ft @ 4,500 rpm |
| Engine Weight (dry) | 412 lbs |
| Acceleration (0-60 mph) | 4.5 s |
| Top Speed | 155 mph (electronically limited) |
In line with AMG’s “Performance 2015” strategy, this new V8 engine was designed to progressively reduce fuel consumption and emissions in future models while simultaneously elevating the brand’s “Driving Performance” ethos. The M152 engine within the mercedes benz amg 2012 exemplifies AMG’s commitment to both performance and environmental responsibility.
New Naturally Aspirated V8: A Close Relative to the Biturbo Powerhouse
The innovative M152 engine in the mercedes benz amg 2012 shares a close lineage with the AMG M157 5.5-liter V8 biturbo engine, which debuted in 2010 and powered models like the E63 AMG and CLS63 AMG. Numerous design elements are shared between these engines, including displacement, bore/stroke dimensions, cylinder spacing, ECO stop/start system, and direct gasoline injection technology.
However, the M152 distinguishes itself through features tailored for a naturally aspirated application. These include redesigned intake air ducting, new cylinder heads, a modified valve drive, an adapted oil supply system, and an optimized crankcase. These distinctions highlight AMG’s meticulous engineering approach, adapting proven technologies to create a unique and highly effective naturally aspirated V8 for the mercedes benz amg 2012.
Advanced Technologies: An Exclusive Combination for Peak Performance
The M152 engine within the mercedes benz amg 2012 boasts an unparalleled combination of advanced technologies. Its high-tech design is truly world-leading. Features like direct injection at an immense 2,900 psi pressure, spray-guided combustion, and piezo injectors are seamlessly integrated with map-controlled cylinder shut-off, an all-aluminum crankcase with “spectacle” honing, four-valve technology featuring continuous camshaft adjustment, a high 12.6:1 compression ratio, a stop/start system, and generator management. All of this technology works in concert while allowing the engine to rev to over 7,000 rpm.
These technologies collectively contribute to exceptional thermodynamic efficiency. This efficiency is crucial for achieving both high fuel economy and low exhaust emissions. By employing a large-displacement, naturally-aspirated eight-cylinder engine with cylinder shut-off, the mercedes benz amg 2012 successfully resolves the traditional trade-off between powerful output/torque delivery and reduced fuel consumption.
AMG Cylinder Management: Mastering Efficiency without Compromising Power
A key innovation in the mercedes benz amg 2012 is the AMG Cylinder Management system. This cylinder shut-off system, entirely developed by Mercedes-AMG, significantly enhances fuel efficiency. Under partial load conditions, cylinders two, three, five, and eight are deactivated, dramatically reducing fuel consumption. This technology finds parallels in Formula 1, where similar cylinder deactivation is used in 750-hp V8 engines for efficiency during cornering, safety car periods, or pit stops.
Diagram illustrating AMG Cylinder Management, enhancing fuel efficiency in the 2012 Mercedes-Benz SLK55 AMG.
Cylinder shut-off operates across a broad engine speed range, from 800 to 3,600 rpm, when the driver selects “C” (Controlled Efficiency) transmission mode. The AMG main menu in the instrument cluster clearly informs the driver when cylinder shut-off is active, indicating whether the engine is running in four or eight-cylinder mode. Even in four-cylinder mode, a substantial 170 lb-ft of torque remains available, providing ample power for typical driving situations. When the driver demands more power and moves out of the partial load range, cylinders two, three, five, and eight are instantly reactivated. The transition between four and eight-cylinder operation is seamless and imperceptible, ensuring no compromise in occupant comfort. At 3,600 rpm, the activation process is completed in a mere 30 milliseconds.
Deactivation Mechanism: Valves Closed, Fuel and Ignition Off
Cylinder shut-off in the mercedes benz amg 2012 is enabled by a sophisticated engine management system featuring 16 hydraulically compensating actuators and an advanced oil supply system within the cylinder head. These actuators are integrated into the cylinder head and effectively keep the intake and exhaust valves of cylinders two, three, five, and eight closed when cylinder shut-off is engaged. Simultaneously, fuel supply and ignition to these cylinders are deactivated.
This deactivation strategy not only minimizes load-change losses from the four inactive cylinders but also boosts the efficiency of the remaining four cylinders. This is achieved by shifting the operating point to a higher load range. The actuators are designed to be compact and lightweight, allowing for taut valve train operation and engine speeds up to 7,200 rpm.
All-Aluminum Crankcase and Silitec Cylinder Liners: Lightweight and Durable
The crankcase of the new AMG 5.5-liter V8 in the mercedes benz amg 2012 is constructed from diecast all-aluminum. This design choice contributes to the engine’s remarkably low dry weight of just 412 lbs, a testament to uncompromising lightweight construction principles. The bearing covers for the main crankshaft bearings are crafted from grey cast iron and are bolted to the crankcase, both vertically and laterally, ensuring exceptional rigidity.
To minimize internal friction and reduce wear, the piston rings are coated with carbon. Cast-in Silitec cylinder liners further reduce friction for the eight pistons. “Spectacle” honing, a unique and complex process, further reduces friction and, consequently, fuel consumption. In this sophisticated procedure, the cylinder liners receive their mechanical surface treatment after being bolted in place. A specialized jig, resembling spectacles, is bolted to the crankcase to mimic the distortion that would occur with the cylinder head installed. This ensures that any static distortion of the cylinder liners caused by tightening the cylinder head bolts is completely eliminated, optimizing piston movement and efficiency.
Further Efficiency Optimizations in the 2012 SLK55 AMG Engine
Beyond cylinder management and lightweight construction, the mercedes benz amg 2012 engine incorporates a suite of additional measures to optimize efficiency:
- Weight-optimized cast aluminum pistons with a special piston skirt coating to reduce friction.
- Special ventilation holes in the crankcase to reduce pumping losses.
- An oil pump with electrically controlled pressure staging for on-demand lubrication.
- A separate, controllable, low-friction vane cell oil pump specifically for cylinder shut-off.
- Engine cooling employing a highly efficient cross-flow principle for optimized temperature management.
- Electronically controlled fuel pressure, fully variable and demand-related between 1,450 and 2,900 psi, ensuring precise fuel delivery.
The forged crankshaft, made from high-grade 38MnS6BY steel alloy, rotates within five main bearings. It features eight counterweights and is optimized for torsional rigidity, inertia, low rotating masses, and extended operating life. A two-mass viscous damper at the front effectively eliminates vibrations. Each connecting rod journal on the crankshaft supports two forged, cracked connecting rods, demonstrating the engine’s robust and high-performance design.
Four-Valve Technology and Variable Camshaft Adjustment: Optimizing Combustion
The mercedes benz amg 2012 engine utilizes four-valve technology with large intake and exhaust valves per cylinder to ensure optimal charging of the combustion chambers. The exhaust valves, subjected to high thermal stress, are hollow and sodium-cooled. Four overhead camshafts actuate the 32 valves via low-maintenance, low-friction cam followers.
Infinitely variable camshaft adjustment, spanning 40 degrees on both the intake and exhaust sides, adapts to engine load and speed. This adjustment optimizes both power and torque output across the rev range and ensures consistent idling at low speeds. Depending on engine speed, valve overlap can be varied to achieve the most effective fuel/air mixture delivery to the combustion chambers and efficient exhaust gas removal. The variable camshaft adjustment is hydraulically actuated via four pivoting actuators, electromagnetically activated and controlled by the engine control unit. The camshafts are driven by three high-performance silent chains, which offer significant noise comfort advantages compared to cylinder roller chains.
Controlled Efficiency Stop/Start: Standard Fuel Saving Technology
The Controlled Efficiency stop/start function, standard on the mercedes benz amg 2012 SLK55 AMG, further reduces fuel consumption. Active in the “C” transmission mode, this system automatically shuts off the V8 engine when the vehicle comes to a stop, such as at a traffic light. Upon releasing the brake pedal or depressing the accelerator, the engine restarts instantaneously, allowing for quick acceleration.
Intelligent technology ensures a comfortable and immediate restart. A crankshaft sensor detects the direction of rotation and the resting position of all eight pistons. For an automatic engine start, the cylinder with the most favorable piston position receives a fuel injection into its combustion chamber. Precise piezo-electric injectors facilitate exceptionally fast starts. The M152 engine always starts in eight-cylinder mode.
A framed “ECO” symbol in the AMG main menu indicates when the Controlled Efficiency stop/start function is active. When cylinder shut-off is also active, the symbol changes to “ECO4,” while “ECO8” signifies eight-cylinder operation without cylinder shut-off. In the more performance-oriented “S” (Sport) and “M” (Manual) driving modes, the stop/start function is always deactivated. Drivers can also manually deactivate it in “C” mode if desired.
Alternator Management: Boosting Fuel Economy Through Energy Recovery
An alternator management system in the mercedes benz amg 2012 further contributes to fuel economy. During engine overrun or braking, kinetic energy is harnessed to charge the battery, rather than being wasted as heat. In other operating modes, a combination of onboard network and alternator management keeps the electrical system voltage at a lower level, reducing parasitic losses and improving overall efficiency.
AMG Sports Exhaust System: Harmonizing Sound and Performance
AMG introduced a new sports exhaust system for the mercedes benz amg 2012, featuring an exhaust flap on each side. This technology ingeniously balances the desire for an emotive exhaust note during spirited driving with a more subdued engine sound during relaxed cruising. The sound design prioritizes a perfect blend of audible performance and the long-distance comfort expected of a Mercedes-Benz.
Each rear silencer incorporates a flap that is variably activated based on driver input and engine speed. At low loads and engine speeds below 2,000 rpm, the flaps remain closed. This forces exhaust gases to travel a longer path through an additional damping element, resulting in a pleasantly muted engine sound and effective suppression of disruptive frequencies – particularly beneficial during four-cylinder operation with cylinder shut-off active.
The AMG sports exhaust system with integrated exhaust flaps allows for variable sound profiles in the 2012 Mercedes-Benz SLK55 AMG.
When the driver accelerates, the flaps progressively open, starting at 15 degrees, then 30, and up to 50 degrees. This allows a portion of the exhaust gases to take a shorter path, while the remainder follows the longer, acoustically dampened route, creating a sonorous engine note. Under full load at higher engine speeds in eight-cylinder mode, both flaps fully open, unleashing the distinct and muscular sound characteristic of an AMG V8, emphasizing the performance potential of the mercedes benz amg 2012.
The two-pipe AMG sports exhaust system, featuring two chromed twin tailpipes, has a pipe diameter of 2.56 inches from the manifolds to the pre-silencer, reducing to 2.36 inches from the pre-silencer to the rear silencers, optimized for both sound and performance.
Effective Emissions Technology: Meeting Global Standards
The exhaust system of the mercedes benz amg 2012 naturally aspirated 5.5-liter V8 was engineered to meet stringent and complex requirements: low exhaust emissions, compliance with global emissions standards, and a characteristic AMG engine sound. The SLK55 AMG successfully meets the Euro-5 emission standard, as well as all US market requirements (LEV-III standard, On-Board Diagnosis II).
Air gap-insulated manifolds ensure rapid catalytic converter response. For efficiency and space optimization, a tandem catalytic converter housing is used on each side of the vehicle. Positioned near the firewall, each housing contains two thin-walled ceramic substrates. This design eliminates the need for previous underbody catalytic converters. The two ceramic substrates within each housing are differentiated to ensure rapid and efficient emissions control: the front substrate is coated with palladium, while the rear features a bimetal coating of palladium and rhodium. Lambda sensors are positioned upstream and downstream of each catalytic converter housing to monitor and optimize emissions control.
AMG SPEEDSHIFT PLUS 7G-TRONIC: Highly Versatile Transmission
Power in the mercedes benz amg 2012 SLK55 AMG is delivered to the rear wheels via the AMG SPEEDSHIFT PLUS 7G-TRONIC automatic transmission. This transmission offers three distinct modes: “Controlled Efficiency” (C), Sport (S), and Manual (M). Automatic rev-matching during downshifts and brief, precisely timed interruptions of ignition and injection during upshifts under full load reduce shift times and enhance the driving experience. A double turbine torsional damper with centrifugal pendulum adapts to engine speed and minimizes vibrations, particularly in four-cylinder operation, while also improving overall comfort.
Chassis and Handling: A Perfect Blend of Dynamics and Comfort
The AMG sports suspension, equipped with Torque Vectoring Brakes and AMG Direct-Steer system, provides the mercedes benz amg 2012 with both exceptional lateral dynamics and agile handling. Whether seeking an aggressive driving style or comfortable cruising, the SLK55 AMG adeptly caters to both. Independent suspension struts with firmer spring/damper tuning, torque strut bearings on the front axle with increased rigidity, stiffer stabilizers at all four corners, and increased negative camber on the rear axle contribute to high cornering speeds and reduced body roll during rapid changes of direction.
In challenging cornering situations, the Torque Vectoring Brakes system selectively applies braking force to the inside rear wheel, generating a controlled rotational movement around the vertical axis. This helps the mercedes benz amg 2012 steer precisely and predictably into corners, maintaining full control without compromising performance. Complementing this is the AMG Direct-Steer system, enhancing handling and agility compared to standard steering while reducing parking effort. A new power steering pump further enhances fuel efficiency by consuming energy only when steering input is actually applied. The AMG Direct-Steer system also incorporates a parameter function specifically tuned to the AMG sports suspension, resulting in optimal responsiveness, excellent road feedback, and sharp handling in all driving scenarios.
The AMG-exclusive 3-stage ESP® system offers driver-selectable control: “ESP ON,” “SPORT Handling Mode,” and “ESP OFF,” accessible via a button on the center console. The AMG high-performance braking system features internally ventilated and perforated brake discs on all wheels, measuring 14.2 inches x 1.4 inches at the front and 13 inches x 0.9 inches at the rear, providing outstanding responsiveness, short stopping distances, and excellent fade resistance.
Optional AMG Handling Package: Elevating Driving Dynamics Further
For drivers seeking an even more focused and dynamic driving experience, the mercedes benz amg 2012 offered an optional AMG Handling Package. This package further amplified the vehicle’s sportiness with an AMG Performance suspension featuring stiffer tuning, an AMG rear axle differential lock for enhanced traction, two-piece brake discs at the front for improved braking performance and reduced unsprung mass, and a three-spoke AMG Performance steering wheel trimmed in premium leather with Alcantara® inserts in the grip areas for enhanced tactile feel and control.
Unmistakable Design: Unique Styling and Appointments
The mercedes benz amg 2012 SLK55 AMG’s design is characterized by classic roadster proportions infused with distinctive AMG styling cues and a hint of inspiration from the SLS AMG. AMG designers enhanced the inherently appealing lines of the long hood, rearward-positioned greenhouse, and crisp rear section with signature AMG styling elements at the front, sides, and rear.
The new AMG front apron features large air inlets and AMG-specific LED daytime running lights. Inspired by the SLS AMG, the wide radiator grille prominently displays a large, centrally-positioned Mercedes star. On the SLK55 AMG, the slats in the front apron and the lower cross strut are finished in high-gloss black. Darkened clear-lens headlamps and darkened bicolor tail lamps are standard and exclusive to this top-of-the-range V8 model. Bi-Xenon headlights with Active Curve Illumination were also available as an option.
The front design of the 2012 Mercedes-Benz SLK55 AMG showcases AMG styling cues and LED daytime running lights.
The vent grilles with chrome-plated fins on the front fenders not only echo the SLS AMG but also pay homage to the iconic Mercedes-Benz 300 SL Roadster of the 1950s. “V8 AMG” lettering beneath the grilles clearly identifies the top-tier eight-cylinder model within the SLK range. AMG-specific side sill panels seamlessly extend the front apron’s design towards the new rear apron. Featuring a unique shape, a black diffuser insert with three fins, and the two chrome-plated twin tailpipes of the AMG sports exhaust system, the rear apron provides a distinctive finishing touch. The spoiler lip on the trunk lid, painted in body color, reduces lift at the rear axle, enhancing stability at higher speeds.
SLS AMG Inspired Interior: High-Quality and Stylish
The interior of the mercedes benz amg 2012 SLK55 AMG mirrors the functional, stylish, and high-quality design of the SLS AMG Roadster. Jet-engine-inspired air vents and a center console finished in brushed aluminum evoke the super sports car. An AMG-specific analog clock with an IWC design is positioned centrally on the dashboard. The AMG Performance steering wheel, with its flattened top and bottom sections, features metal trim, aluminum shift paddles, and perforated leather grip areas. The clearly laid-out AMG instrument cluster, positioned perfectly within the driver’s field of vision, includes four circular instruments, distinctive dials, and the AMG main menu. The button for selecting transmission modes C, S, and M is conveniently located on the center console.
AMG sports seats offer enhanced lateral support and are upholstered in premium leather with AMG badges embossed in the backrests. The standard AIRSCARF neck-level heating system further elevates comfort, especially during open-top driving in cooler conditions.
MAGIC SKY CONTROL Panorama Roof: A Touch of Magic
The standard retractable hardtop of the mercedes benz amg 2012 opens and closes in under 20 seconds, transforming the roadster into a closed coupe with a rigid roof at the touch of a button. Alternatively, a panorama roof panel in tinted polycarbonate was available. However, the truly groundbreaking option was the panorama roof with MAGIC SKY CONTROL. This innovative glass roof could switch between light and dark at the press of a button. In its transparent state, it provided an open-air experience even in cold weather. When darkened, the roof offered welcome shade and prevented the interior from overheating in strong sunlight, providing climate comfort at the touch of a button.
The frames of all three roof variants were constructed from magnesium, making each roof approximately 13 lbs lighter than the previous model. This weight reduction contributed to a lower center of gravity, further enhancing the car’s agility. A comfortable alternative to the standard wind-stop was the new AIRGUIDE pivoting wind-stop. It consisted of pivoting transparent plastic wings attached to the back of the rollover bars, eliminating the need for manual installation or removal.
Exceptional Safety and Assistance Systems: Modern Standards
The mercedes benz amg 2012 SLK55 AMG set new safety benchmarks in its segment. A comprehensive suite of the latest assistance systems supported the driver and reinforced the roadster’s exceptional position. Standard safety equipment included a new, fiber-reinforced roll-over bar, two-stage driver and front passenger airbags, headbags, thorax airbags, knee airbags, seat belt tensioners with belt force limiters, NECK-PRO crash-active head restraints, three-stage ESP®, and ATTENTION ASSIST drowsiness detection.
Optional assistance systems included:
- DISTRONIC PLUS: This adaptive cruise control system automatically maintained a preset distance from the vehicle ahead, even capable of braking the SLK55 AMG to a complete stop and resuming acceleration.
- PRE-SAFE® Brake: This system detected an imminent rear-end collision and prepared for autonomous braking, active at speeds between 19 and 124 mph when moving vehicles were detected ahead.
AMG SLK Heritage: Three Generations of Performance Roadsters
The mercedes benz amg 2012 SLK55 AMG represents the third generation of AMG’s exclusively dynamic roadster model. The lineage began in 2001 with the SLK32 AMG, powered by a supercharged AMG V6 engine producing 349 hp and 332 lb-ft of torque, making it the most powerful vehicle in its competitive set at the time.
In late 2004, the SLK55 AMG followed. Equipped with an AMG 5.5-liter V8 engine generating 355 hp and 376 lb-ft of torque, it once again led its segment in power. No other vehicle in this class offered a large-displacement eight-cylinder engine – a philosophy Mercedes-AMG consistently upheld with the mercedes benz amg 2012 successor model, continuing the legacy of high-performance open-top driving.
In conclusion, the 2012 Mercedes-Benz SLK55 AMG is a testament to AMG’s dedication to driving performance and innovation. It masterfully blends raw power with advanced technology and sophisticated design, solidifying its position as a leader in the high-performance roadster segment.
