2012 Mercedes-Benz SLK55 AMG to get a new V8 engine

Article by Christian Andrei, on July 19, 2011

A new 5.5-liter V8 engine will be used to power the Mercedes-Benz SLK-Class AMG that will be displayed at the Frankfurt Motor Show. This 5,461cc engine is a normally aspirated version of the twin-turbo 5.5-liter V8 engine that is used on the new CLS63 AMG and E63 AMG models.

The two turbos had to be removed so that the all aluminum 187kg V8 can be fitted in the SLK. A post at autocar.co.uk revealed that the new 5.5 V8 offers 60hp more than the old V8 in the outgoing SLK55 AMG to 420 hp.

Meanwhile, torque had increased from 509 Nm to 539 Nm (376lb-ft to 398lb-ft). In addition, the fuel economy and CO2 emissions got a 30% boost in the new SLK55-AMG compared to the previous model.

This engine is fitted with an F1-inspired AMG Cylinder Management shut-off system, which permits the engine to run on just four cylinders under partial loads to improve economy. In addition, the SLK55 AMG gets a new sports exhaust system with two separate rear silencer flaps.

These remain closed at low revs below 2000rpm. They progressively open as the driver applies more throttle, resulting to a louder exhaust note. At the Frankfurt show, the SLK55 AMG will be displayed beside a diesel version of the new SLK.

This marks the first time that an oil-burner has features in the roadster. Powering the Mercedes SLK250 CDI is a 201hp four-cylinder turbodiesel that is used in several staple Mercedes models. These two models are scheduled to arrive at showrooms by early 2012.

Here comes the latest version of the Mercedes-Benz’s performance-laden roadster – the new SLK 55 AMG. It is now sportier and more dynamic in terms of handling and styling. The only vehicle in its class to offer a V8 engine, the new SLK 55 AMG is specified with a much improved AMG SPEEDSHIFT 7G-TRONIC transmission that provides quicker and more seamless gear changes. Handling is enhanced by a new direct steering system with variable servo assistance, thereby making the SLK 55 AMG more responsive and more agile than before.

This direct steering element is well conveyed inside the SLK 55 AMG with the presence of the new three-spoke AMG ergonomic sports steering wheel. It features a well-shaped grip area wrapped in perforated leather and a vertical spoke with silver-colored insert. The AMG steering wheel features two aluminum AMG shift paddles that facilitate manual gear shifting. As a performance roadster, the SLK 55 AMG is fitted with dark-tinted projection-beam headlamps and a new front apron with a more pronounced arrow-shape, as well as a modified Mercedes star and larger air dams.

This front apron feature side outlets that take care of discharging the hot air from the integral engine oil cooler. In addition, the SLK 55 AMG features a black-painted transverse fin on the lower section. Moreover, the car features large, round fog lamps with chrome surrounds positioned further outwards to highlight its width.

The SLK 55 AMG also features LED indicator repeaters in an arrow design as well as larger exterior mirrors that offer improved rearward visibility. In addition, the SLK 55 AMG is fitted with AMG side skirts, AMG spoiler lip and AMG rear apron with a black insert. Accentuating the sides of the SLK 55 AMG are new multi-spoke 18-inch AMG light-alloy wheels. The wheels are finished in titanium grey and feature a high-sheen star for a striking contrast when viewed from the side.

With widths of 7.5 inches on the front and 8.5 inches at the rear, the AMG light-alloy wheels are wrapped in size 225/40 front and 245/35 rear tires. Customers may also avail of two-spoke high-sheen 18-inch AMG light-alloy wheels. Deceleration and stopping are taken care of by AMG high-performance braking system that features internally ventilated brake discs all-round at sizes of 345 x 30 mm on the front and 300 x 22 mm at the rear.

Meanwhile, the interior of the SLK 55 AMG has elements that reflect its performance nature. For instance, it comes with an AMG instrument cluster with a 320 km/h speedometer scale, silver/red needles and AMG lettering. Moreover, the AMG instrument cluster has new graphics that helps drivers better recognize the roadster’s speed and rpm. When operated in "M" mode, the AMG main menu would display the car’s current gear selection and even provides an upshift recommendation.

It would also display the battery voltage, the RACETIMER and the engine oil temperature. Occupants are treated to AMG sports seats with a special upholstery layout that features pronounced side bolsters that offer enhanced lateral support during high-speed cornering – with further support from the Alcantara inserts in the shoulder areas. As standard, the interior of the SLK 55 AMG is appointed with fine nappa leather upholstery, which could be availed in four attractive colors, including the black/gullwing red combination.

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