Forming part of the third-generation of the SLK launched in June 2011, the brand new AMG model catches the attention at first look: distinctive AMG gentle-alloy wheels, unique AMG physique styling with AMG spoiler lip and two chrome-plated twin tailpipes at the rear complement the traditional roadster proportions, while including a distinct athletic touch. The expressive design of the 2012 Mercedes-Benz SLK55 AMG is each eye-catching and unmistakable.
The Mercedes-Benz SLK55 AMG is the proper embodiment of the new AMG model declare of "Driving Performance": in the compact high-performance Roadster phase there's nothing to match to its mixture of tangible driving dynamics, superior sportiness, distinctive excessive-expertise and low fuel consumption. The SLK55 AMG accelerates from zero to 60 mph in 4.5 seconds, and reaches a prime speed of 155 mph (electronically restricted).Helping to set new gas effectivity standards for V8's, the 5.5 liter engine combines low consumption figures with superior power supply and the everyday exhaust growl which only a big-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 latest models over the next few years - while reaching new heights with the central model claim of "Driving Efficiency". At the same time, AMG can be 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. Quite a few design options are similar, such because the displacement, bore/stroke, distance between cylinders, ECO stop/begin system and direct gasoline injection technology. Distinguishing options versus the M157 embrace the new intake air ducting, new cylinder heads, the modified valve drive, an tailored oil supply system and an optimized crankcase.
Exclusive combination of superior applied sciences
The high-tech M152 motor dazzles with a mix of superior technologies which is unequalled anywhere within the world. No other gasoline engine features direct injection at a stress of two,900 psi, spray-guided combustion and piezo injectors, all along with map-controlled cylinder shut-off, an all-aluminum crankcase with "spectacle" honing, fourvalve know-how with steady camshaft adjustment, a excessive compression ratio of 12.6:1, a cease/begin system and generator administration - whereas revving to a maximum pace of over 7,000 rpm. All of these options result in excessive thermodynamic effectivity which is crucial for top gas efficiency and low exhaust emissions. Utilizing a large-displacement, naturally-aspirated eight-cylinder engine with cylinder shut-off resolves the trade-off between excessive output/torque delivery and low gas consumption figures.
AMG Cylinder Administration
The AMG Cylinder Administration cylinder shut-off system - developed completely by Mercedes-AMG - considerably improves effectivity: cylinders two, three, five and eight are minimize off underneath partial load, which lowers gasoline consumption considerably. In related kind, this know-how is also used within the 750-hp V8 engines used in Method 1. As efficiency additionally plays a significant function on the pinnacle of motor racing, two or four of the eight cylinders are minimize off e.g. when cornering at slow velocity, throughout Security Automobile laps or for pit stops.
The cylinder shut-off function is obtainable over a large engine pace vary from 800 to three,600 rpm if the driver has chosen transmission mode "C" - Controlled Efficiency. The AMG primary menu in the instrument cluster informs the driver whether cylinder shut-off is energetic, and whether or not the engine is at the moment working in 4 or eight-cylinder mode. A minimum of a hundred and seventy lb-ft of torque remains to be accessible in 4-cylinder mode - sufficient power to ensure loads of acceleration in most driving situations. As soon as the driver has a need for extra energy and leaves the partial load vary, cylinders two, three, 5 and eight are activated. The switch from 4 to eight-cylinder operation is quick and imperceptible, resulting in no lack of occupant comfort. At an engine speed of three,600 rpm the activation process takes not more than 30 milliseconds.
Valves closed, gasoline delivery and ignition deactivated
Cylinder shut-off is made attainable by the intelligent engine management system, with sixteen hydraulically compensating actuators and a classy oil provide system in the cylinder head. The compensating actuators are integrated into the cylinder head, and preserve the intake and exhaust valves of cylinders two, three, five and eight closed when cylinder shut-off is active. On the identical time their gas provide and ignition are deactivated. This not solely enables the loadchange losses of the 4 deactivated cylinders to be decreased, but in addition will increase the efficiency of the 4 remaining cylinders. This is because the operating point is transferred to the upper load range. The actuators are compact and lightweight, allowing taut valve practice 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 encompasses a diecast allaluminum construction. The low (dry) engine weight of just 412 lbs is the results of uncompromising lightweight construction methods. The bearing covers for the principle crankshaft bearings are gray cast iron, and are bolted to the crankcase, in addition to on the perimeters, for top rigidity.
The piston rings are carbon-coated to attenuate inner friction and scale back wear. Solid-in Silitec cylinder liners guarantee low friction for the eight pistons. Distinctive "Spectacle" honing is one other measure to reduce friction and therefore fuel consumption: on this sophisticated and complex course of, the cylinder liners obtain their mechanical floor treatment when already bolted in place. As honing would not be doable with the cylinder head put in, a jig resembling spectacles is bolted to the crankcase. The cylinder liners distort as if the cylinder head had been in place, and are solely then given their mechanical surface treatment. As a result, any static distortion of the cylinder liners caused by tightening the cylinder head bolts could be utterly eliminated.
Different measures to optimize effectivity:
* weight-optimized solid aluminum pistons with special piston skirt coating
* particular air flow holes within the crankcase
* oil pump with electrically controlled stress stage
* separate oil pump for cylinder shut-off as a controllable, low-friction vane cell pump
* engine cooling utilizing particularly efficient cross-circulation precept
* electronically controlled gas stress, absolutely variable and demand-related between 1,450 and 2,900 psi
The cast crankshaft of excessive-grade 38MnS6BY metal alloy rotates in 5 essential bearings, has eight counterweights and has been optimized with respect to torsional rigidity, inertia, low rotating lots and a long operating life. A twomass viscous damper mounted on the front reliably eliminates vibrations. Each connecting rod journal on the crankshaft carries two cast, cracked connecting rods.
4-valve technology with variable camshaft adjustment
Good charging of the combustion chambers is offered by massive intake and exhaust valves, four per cylinder. The exhaust valves, that are subject to excessive thermal loads, are hole and sodium-cooled. 4 overhead camshafts function the 32 valves via low-upkeep, low-friction cam followers. The infinitely variable camshaft adjustment inside a range of 40 levels on the intake and exhaust sides adapts to engine load and engine speed, leading to excessive output and torque values. This additionally offers constant idling at a low speed. Relying on the engine speed, valve overlap can be diversified for the absolute best gas/air provide to the combustion chambers and efficient removal of the exhaust gases. The variable camshaft adjustment is carried out hydraulically through four pivoting actuators. These are electromagnetically activated and managed by the engine management unit. The camshafts are driven by three excessive-performance silent chains, which have appreciable benefits in terms of noise comfort in contrast with cylinder roller chains.
Managed Efficiency stop/start operate as normal
The Managed Efficiency cease/begin perform further contributes to the low gasoline consumption. This system is normal gear on the Mercedes-Benz SLK55 AMG and lively within the fuel economic system transmission mode "C". As soon as the motive force brakes to a stop e.g. at a red site visitors mild, the V8 engine is mechanically switched off. Once the brake pedal is released or the accelerator is depressed, the engine is immediately restarted and the automobile is able to move off quickly. Clever know-how gives a cushty and instant starting procedure: a crankshaft sensor recognizes the direction of rotation and registers the resting position of all eight pistons. For an computerized engine start, the cylinder with probably the most favorable piston place receives an injection of gasoline into its combustion chamber. The exact piezo-electric injectors vastly help this process, as they make especially fast starts possible. The M152 at all times begins in eight-cylinder operation.
A framed "ECO" symbol in the AMG main menu exhibits the motive force that the Managed Effectivity stop/start operate is active. When cylinder shut-off is energetic, the driving force is informed by the symbol "ECO4", while "ECO8" stands for eight-cylinder operation. Within the two extra efficiency-oriented driving modes "S" (Sport) and "M" (Handbook), the cease/begin operate is at all times deactivated. If required, the driving force can also switch it off while in "C" mode as well. In this case neither a "stop/start" nor an "ECO" symbol appears.
Alternator administration helps to save lots of fuel
An alternator management system makes a further contribution to gasoline economy: each time the V8 engine is in overrun or when braking, kinetic vitality is used to charge the battery somewhat than wasted as heat. In all other working modes a combination of onboard network and alternator administration enables the electrical system to be stored at a low voltage.
New AMG sports activities exhaust system with built-in exhaust flaps
AMG is premiering a new sports exhaust system that includes an exhaust flap on each side. This technology resolves the trade off between an emotional exhaust word during spirited driving and a extra discreet engine sound within the partial load range. The main focus of the sound design was to realize an ideal synthesis of perceptible efficiency and the lengthy-distance comfort that is a hallmark of Mercedes.
Every of the 2 rear silencers has a flap which is variably activated on a logiccontrolled basis depending on the motive force's power requirement and the engine speed. At low loads and engine speeds under 2,000 rpm the flaps remain closed. This causes the exhaust gases to cover a longer distance and move by an additional damping aspect, in order that the engine sound is pleasantly subdued and disruptive frequencies are successfully suppressed - leading to a mellow tone especially in 4-cylinder operation when cylinder shut-off is active.
When the motive force accelerates, the flaps open at an angle of 15, then 30 and as much as 50 degrees in order that some of the exhaust gases cowl a short distance while the remaining comply with the longer, acoustically dampened path producing a sonorous engine note. Below full load at larger engine speeds in eight-cylinder mode, both flaps are absolutely 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 diminished to 2.36 inches from the pre-silencer to the rear silencers.
Efficient emissions technology with new catalytic converter packing containers
Low exhaust emissions, compliance with country-particular requirements and a characteristic engine sound - the necessities for the exhaust system of the brand new, naturally aspirated AMG 5.5-liter V8 engine had been a number of and complex. The 2012 SLK55 AMG complies with the present Euro-5 emission normal, in addition to assembly all the necessities of the US market (LEV-III standard, On- Board Diagnosis II).
Air gap-insulated manifolds ensure a fast catalytic converter response. For efficiency and to save lots of area, this design has a tandem catalytic converter housing on either side of the automobile: 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 make sure rapid and efficient emissions management: 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 situated in entrance of every catalytic converter housing, and there is a lambda diagnostic sensor between every of the 2 skinny-walled substrates.
Extremely variable: the AMG SPEEDSHIFT PLUS 7G-TRONIC
Power is transferred to the rear wheels by way of the AMG SPEEDSHIFT PLUS 7G-TRONIC automatic transmission which features three transmission modes: "Controlled Effectivity" (C), Sport (S) and Guide (M). The automatic rev-matching perform when downshifting in addition to the brief, precisely outlined interruption of ignition and injection when upshifting underneath full load shorten shift times and improve emotional appeal. A double turbine torsional damper with centrifugal pendulum adapts to engine velocity and helps reduce vibrations in four-cylinder operation in addition to enhances comfort.
Excellent mixture: highly expressive driving style and comfortable cruising
The AMG sports activities suspension with Torque Vectoring Brakes and AMG Direct- Steer system offers both impressive lateral dynamics as well as agile handling. On the lookout for a extremely aggressive driving style or snug cruising? The brand new Mercedes-Benz SLK55 AMG is able to offer both. Impartial suspension struts with stiffer spring/damper tuning, torque strut bearings on the front axle featuring larger rigidity, stiffer stabilizers in any respect 4 corners in addition to a extra detrimental camber on the rear axle result in excessive cornering speeds and low body roll in fast S-formed bends.
In important cornering circumstances, the Torque Vectoring Brakes produce a defined rotational motion of the car in regards to the vertical axis in fractions of seconds, via selective brake actuation at the rear wheel on the inside of the bend. This leads to the SLK55 AMG steering into the turn exactly and under full management, without any compromises where efficiency is concerned. Complementing this characteristic is the AMG Direct-Steer system which enhances handling and agility in contrast with the standard steering, whereas additionally lowering the quantity of physical effort required when parking. A new power steering pump helps to cut back gasoline consumption by utilizing energy solely when the driver is actually steering. As well as, the AMG Direct-Steer system has a parameter perform adapted to match the AMG sports suspension. This ends in optimum response from the central place, excellent highway feel and sharp dealing with in all driving situations.
The AMG-unique three-stage ESP® gives particular person management selections at the contact of a button: the ESP® button in the center console permits the driving force to decide on between "ESP ON", "SPORT Dealing with 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 thirteen in. x .9 in. at the rear. The system is characterized by excellent responsiveness, brief stopping distances and wonderful fatigue resistance.
Elective AMG Handling Package for even better driving dynamics
The optionally obtainable AMG Handling Bundle enhances the car's sportiness even further. It contains an AMG Efficiency suspension with stiffer tuning, an AMG rear axle differential lock, two-piece brake discs at the front and a 3-spoke AMG Performance steering wheel finished in premium leather with Alcantara® inserts in the grip areas.
Unmistakable: uniquely styled design and appointments
Basic roadster proportions with typical AMG design traits as well as a hint of the SLS AMG -are putting visual highlights of the 2012 Mercedes-Benz SLK55 AMG. The AMG designers have complemented the exciting basic types of the long hood, the greenhouse positioned well to the rear and crisp rear part with typical AMG styling at the front, sides and rear. The brand new AMG front apron has massive air inlets and AMG-particular LED daytime operating lights. Inspired by the SLS AMG tremendous sports car, the vast radiator grill options a big, 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 back lights additionally come as customary exclusively on the top-of-the-vary V8 model. Bi-Xenon headlights with Active Curve Illumination are additionally obtainable as an elective extra.
The vent grilles with chrome-plated fins within the entrance fenders will not be only paying homage to the SLS AMG, but in addition evoke reminiscences of the famous Mercedes-Benz 300 SL Roadster from the 1950s. The "V8 AMG" lettering beneath the grilles highlight the top-of-the-vary eight-cylinder mannequin from the rest of the SLK mannequin series. AMG-specific, distinctively styled aspect sill panels continue the design of the entrance apron by way of to the new rear apron. With its own distinctive form, black diffuser insert with three fins as well as the 2 chromeplated twin tailpipes of the AMG sports exhaust system, it gives a distinctive completion to the vehicle. The spoiler lip on the trunk lid, painted within the automobile physique coloration, reduces carry on the rear axle and thereby will increase driving stability at excessive speeds.
Inspired by the SLS AMG: excessive-quality, trendy interior
Purposeful, stylish, excessive-high quality: the interior design of the Mercedes-Benz SLK55 AMG is also reminiscent of its greater brother, the SLS AMG Roadster. Associations with the super sports activities automotive are evoked courtesy of the four air vents within the model of jet engines, as well as the middle console finished in brushed aluminum. Placed within the middle of the dashboard is an AMG-specific analog clock featuring an IWC design. The AMG Efficiency steering wheel, with its flattened prime and backside sections, additionally boasts metallic trim, aluminum shift paddles and grip areas completed in perforated leather. The clearly-arranged AMG instrument cluster is positioned completely in the driver's field of vision and options 4 round instruments, distinctive dials and the AMG fundamental menu. The button for the transmission modes C, S and M is also located in the center console.
The AMG sports activities seats feature optimized lateral support and premium leather-based upholstery with AMG badges in the backrests and normal AIRSCARF necklevel heating system.
Magical: the panorama roof with MAGIC SKY CONTROL
The usual retractable hardtop opens and closes in less than 20 seconds, reworking the open-prime Roadster into a closed-high Coupe with inflexible roof on the contact of a button. Alternatively, a panorama roof panel in tinted polycarbonate will also be chosen. The third variant is a world premiere - the panorama roof with MAGIC SKY CONTROL. This glass roof switches to mild or darkish as required at the press of a button. When activated it is just about transparent, providing an open-air experience even in cold weather. In its dark state the roof gives welcome shade and prevents the interior from heating up from the solar's intense rays. In other words: a comfortable environment at the contact of a button.
The frames of the three roof variants are fabricated from magnesium. This makes every roof round 13 lbs lighter than within the earlier mannequin, giving the automotive a lower heart of gravity - which benefits its agility. A comfortable alternative to the usual wind-cease is the new AIRGUIDE pivoting wind-stop. It consists of pivoting clear plastic wings that are hooked up to the again of the rollover bars. The advantage: no installation or elimination effort required.
Distinctive place: trendy assistance systems on board
The 2012 SLK55 AMG sets new standards in the case of safety: an entire host of the most recent help systems assist the driver and assist safe the new AMG Roadster's distinctive place in its segment. Commonplace tools includes new, fiber-strengthened roll-over bar, two-stage driver and front passenger airbags, headbags, thorax airbags, knee airbags, seat belt tensioner with belt power limiters, NECK-PRO crash-lively head restraints, three-stage ESP® and also ATTENTION ASSIST drowsiness detection.
Additional help techniques can be found on request:
* DISTRONIC PLUS: this proximity management system robotically maintains a set distance from the car ahead, braking the Mercedes-Benz SLK55 AMG to a stop if vital and likewise accelerating the Roadster again.
* The PRE-SAFE® Brake detects the acute danger of a rear-finish collision and prepares for autonomous braking. The system is active at speeds of between 19 and 124 mph when transferring automobiles are detected in entrance of the car.
Three generations: the SLK made by AMG
The 2012 SLK55 AMG is already the third era of the solely 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 probably the most highly effective automobile among the competition.
At the finish 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 additionally took the lead in its segment. No different car on this class gives a large-displacement eightcylinder engine - and Mercedes-AMG has remained constantly true to this philosophy with the successor model. The new 2012 SLK55 AMG will rejoice its U.S. market launch in early 2012.
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