Mercedes has released a video of their new M152 powerplant, which is a naturally-aspirated V8. Based on the twin-turbocharged M157 with which it shares the same displacement, the M152 produces 416 horsepower and a torque figure just shy of 400 pounds-foot.
This is the very engine that is in the newly introduced 2012 SLK 55 AMG. One notable feature of this engine is its non-V8 fuel consumption characteristics. It’s because of AMG Cylinder Management, which can disengage half of the V8’s cylinders. By employing this system, the driver can see gains of up to 30 percent in fuel economy, which would give it a consumption figure of 8.5 liters per 100 kilometers. Pretty good for an 8-cylinder sports car. Despite this significant gain in fuel economy, the SLK 55’s engine can still produce 170 lb-ft of torque in 4-cylinder mode, which should be good enough to motoring around in the urban environment or tooling around on a lazy Sunday drive.