US: Two new V8 engines from Mercedes image

The new 4.6-liter V8 engine has 20 percent smaller displacement than its predecessor but generates 429 horsepower and 516 lb.-ft. of torque – 12 percent more horsepower and 32 percent more torque than the engine it replaces yet fuel economy improves by about 10%.

This new engine is available in the restyled 2011 CL550 4MATIC, there remedy with an MSRP of $114,025.

The second engine making its debut is the hand-assembled high-performance 5.5-liter AMG V8 engine, featuring the use of stop/start technology as well as twin turbochargers and direct injection. This new engine produces 536 hp and 590 lb-ft of torque while at the same time achieving an estimated 20 percent improvement in fuel economy.

Mated to the 7-speed AMG SPEEDSHIFT MCT transmission, this new engine is available in the 2011 CL63 AMG coupe ($151,125) and S63 AMG sedan ($138,875).