2012 Mercedes SLK55 AMG to have 416 hp - report

I thought only BMW was working on the Tri-Turbo thing... I think an electric compressor would be a better option. We should extract more energy from the Exhaust system using Heat Recuperators and Turbines which turns a high capacity Alternator which in turn operates the Electric Compressor and all other electrical components. I think Honeywell is already working on such technologies.

187kg is not heavy by v8 standards, it is lighter than BMW's V8 in current M3 and perhaps even lighter than the N54 found in the straight six twin turbo in the 1 M

MadAboutCars where did you find that this exact engine weights 187 kg? Link please.

There is a detailed write up of this engine on the AMG Private Lounge and that puts the weight of the engine at 187KG. Don't wanna give it all away until its fully released to all but a sneak peak on the new exhaust: "Each of the two rear silencers has a flap which is variably activated on a logic-controlled basis depending on the driver's power requirement and the engine speed. At low loads and engine speeds below 2000 rpm the flaps remain closed. This causes the exhaust gases to cover a longer distance and flow through an additional damping element, so that the engine sound is pleasantly subdued and irritating frequencies are effectively suppressed ? resulting in a harmonious sound impression especially in four-cylinder operation when cylinder shut-off is active. When the driver accelerates, the flaps open at an angle of 15, then 30 and up to 50 degrees so that some of the exhaust gases cover the longer, acoustically dampened distance and some the shorter distance. This produces a sonorous engine note. Under full load at higher engine speeds, in performance-oriented eight-cylinder operation, both flaps are fully opened so that the occupants are able to enjoy the decidedly muscular sound typical of an AMG V8. In short, they are left in no doubt about the performance potential of the 310 kW (422 hp) naturally aspirated AMG eight cylinder engine." "The crankcase of the new AMG 5.5-liter V8 engine is of diecast all-aluminum construction. The low (dry) engine weight of just 187 kilograms is the result of uncompromising lightweight construction methods. The bearing covers for the main crankshaft bearings are of grey cast iron, and are bolted to the crankcase, as well as on the sides, for high rigidity."

M3 V8 weighs in at 202KG!