Mercedes Introduces New Fuel-Efficient V6, V8 Engines

Published May 5, 2010

Just the Facts:
- Mercedes-Benz says its upcoming 4.7-liter twin-turbo V8 and 3.5-liter V6 will post big gains in fuel economy and power.
- The 4.7-liter twin-turbo V8 is rated at 435 horsepower and 516 pound-feet of torque, with a 22 percent improvement in fuel economy.
- 3.5-liter V6 makes 306 hp and 273 lb-ft of torque with a 24 percent jump in fuel economy.


STUTTGART, Germany — Mercedes-Benz announced today that its upcoming 4.7-liter twin-turbo V8 and 3.5-liter V6 will post gas-electric hybrid-like jumps in fuel economy, 22 percent and 24 percent respectively. The engines will deliver more power, too.

Those numbers are not official EPA numbers, but are Mercedes' own estimates. Further since a chunk of that fuel economy comes from the company newly standard start/stop system, it's not likely to show up as quite as great a fuel economy improvement on U.S.-market window stickers since the EPA's current testing standard doesn't really reflect the improved real-world economy that comes from this type of system.

The new V8 is a direct-injected twin-turbo unit of 4663 cc displacement. According to Mercedes, the engine, which will appear first in the CL-Class coupe and S-Class sedan this fall, will pump out a healthy 435 horsepower and 516 pound-feet of torque, up 12 percent and 32 percent respectively. Thanks to the direct injection system, Mercedes can run the engine at 10.5:1 compression ratio.

The V6 starts with a new architecture. It goes from a 90 degree V angle to 60 degrees. I has all-new intake and exhaust and will make 306 hp and 273 lb-ft of torque. Mercedes claims that an S350 (a model we do not get in the U.S.) will achieve 24 percent better fuel economy than the old S350. Again, a large part of the improvement comes from the standard stop/start system. No word on when or in what model the new V6 will debut.

Another element of both new engines (and one that should be reflected in EPA fuel economy numbers) is the addition of ancillary units that consume less of the engine's power. These include water pump, oil pump and fuel pump. Both motors will also come with intelligent generation management systems

http://www.insideline.com/mercedes-b...8-engines.html

New Mercedes-Benz AMG Twin-Turbo V8 Makes 563 Horsepower

The AMG arm of Mercedes-Benz introduced its latest engine here today at its headquarters in Affalterbach, Germany. The new engine is a 5.5-liter direct injection twin-turbo V8 and it will eventually replace the current 6.2-liter normally-aspirated V8 throughout the lineup. AMG vehicles equipped with the new engine will still be referred to as "63s" though because Mercedes likes the sound of it.

There will be two levels of tune when the engine debuts in the S63 AMG later this year. The base setup will generate 536 horsepower and 590 pound-feet of torque. And since that's not complete overkill, there will be an optional Performance Pack that dials in additional boost to deliver 563 horsepower and 664 pound-feet of torque. Like the current E63 and SL63, the new S63 will use Mercedes' latest MCT Sportshift seven-speed automatic transmission.

According to Mercedes, the S63 AMG will go from 0 to 60mph in 4.5 seconds in standard tune and a tenth quicker with the Performance Pack. The M157, as it's known internally, weighs slightly more than its predecessor (450 lbs. vs. 438), but fuel efficiency is way up. Mercedes says the S63 AMG will get up to 23.5 mpg on the highway, a 25% improvement. A stop/start feature is one reason for the increased efficiency.