Mercedes has revealed the tantalizing specs of the 2012 SLK55 AMG, the most powerful example of the retractable hardtop roadster ever built. Sharing a similar front-end design with its big brother, the SLS AMG, the new SLK55 shoehorns a V-8 engine and some clever fuel-saving technology into its petite proportions.
At the heart of the car is the new M152 engine, which is based on the M157 bi-turbo 5.5-liter V-8 that can be found in the E63 AMG, CLS63 AMG, S63 AMG and CL63 AMG. Mercedes has jettisoned the turbochargers in the M152, but technical aspects such as the displacement, bore and stroke, and direct-injection systems are identical in both engines. In the SLK55 AMG, the 5.5-liter V-8 pushes out 425 bhp at 6800 rpm and 398 lb.-ft. of torque at 4500 rpm.
According to Mercedes’ estimates, the new 2012 SLK55 will accelerate from 0 to 60 mph in 4.5 seconds. The top speed is electronically limited to 155 mph, though the optional AMG Handling Package raises this to 174 mph.
Mercedes hasn’t simply shoved a big engine into a small car. The German automaker has also loaded the SLK 55 AMG with fuel saving features that include a stop/start system and cylinder deactivation. With the 7-speed automatic transmission in “C”—Controlled Efficiency mode—the SLK55 will determine if it can save fuel by switching to 4-cylinder operation. (more)
Keep Reading: 2012 Mercedes-Benz SLK55 AMG – First Look >>
Photos: 2012 Mercedes-Benz SLK55 AMG >>
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