Home Signal to Noise Coupes Convertibles Sedans Miscellanea Engine: M113 (2003 through 2006) 4,966cc SOHC 24-valve V8. High-pressure die-cast aluminum alloy block and heads. Forged crank and rods. Chain driven single over head cam with three valves per cylinder. 10:1 compression ratio. 97.0 mm Bore / 84.0 mm stroke Bosch Motronic ME 2.8 engine management system with integrated sequential multipoint fuel injection and phased dual plug ignition. This includes individual cylinder control of fuel spray, electronic throttle control, spark timing and phase, and antiknock control. Two high-energy ignition coils / spark plugs per cylinder, with 100,000-mile spark plug intervals. Electronically controlled throttle. Magnesium two-stage variable length intake manifold. 302 HP at 5600 RPM 339 lb-ft of torque between 2,700 and 4,250 RPM M273 (2007 and later) 5,461cc DOHC 32-valve V8. High-pressure die-cast aluminum alloy block and heads. Forged crank and rods. Chain driven dual overhead camshafts with four valves per cylinder and continuously variable intake and exhaust valve timing. 10:7 compression ratio. 98.0mm Bore / 90.5 stroke Bosch Motronic ME engine management system with integrated sequential multipoint fuel injection with one individual coil and spark plug per cylinder. Electronically controlled throttle. Magnesium two-stage variable length intake manifold. 382 HP at 6000 RPM 391 lb-ft of torque between 2,800 and 4,800 RPM "Mercedes-Benz " and "AMG " are registered trademarks of Daimler AG.  This website is not affiliated with, sponsored by, nor authorized by Daimler AG, Mercedes-Benz USA, any of their affiliates, nor their subsidiaries. © Marcus B. Fitzhugh 2005 Mercedes-Benz Specifications