New Mercedes-Benz Direct Injection, Multi-Spark V6 and V8 Engines Revealed

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With the automotive world turning to direct-injection for fuel economy and performance benefits, it was only a matter of time before Mercedes-Benz, a leader in diesel engines, which first received direct injectors, modified the technology for gasoline engines like so many others have now done.

Direct-injection will soon be applied to a new family of V6 and V8 powerplants set to launch in the flagship S-Class sedans and CL-Class coupes this fall. V6 and V8 engine displacements will be 3.5 litres and 4.7 litres respectively, while piezo-electric injectors used on the latest diesel engines will get the nod for the new gasoline powerplants.

Direct-injection is more efficient because it allows for greater fuel delivery precision and a charge cooling effect that increases torque output by allowing for a higher compression ratio. The result is 516 lb-ft of torque spanning 1,800 to 3,500 rpm in the V8, plus 429 horsepower.

Multi-spark ignition is another technology added to Mercedes' new lineup of engines. New coils can transmit up to four sparks per millisecond thanks to their ability to recharge much faster than the coils previously used. A more complete combustion allows for lower emissions and better overall performance.

Another engine feature is idle-stop, or what is also referred to as a direct-start auto stop-start system. When coming to a complete stop, the engine will temporarily shut down to save on fuel and reduce emissions, while simultaneously eliminating unwanted noise and vibrations common to idling engines. The engine will immediately and seamlessly fire up when the foot brake is released, allowing for quick takeoff from a stoplight.  This technology was initiated by hybrids, specifically the first generation Honda Insight and Toyota Prius, and has now permeated the conventional industry from compacts like the Mazda3 to exotics such as Porsche's new Panamera four-door coupe.

While idle-stop reduces engine vibration while stopped for obvious reasons, the new engine family will nevertheless be better balanced than the outgoing design thanks to a 60-degree configuration rather than the 90-degree "V" previously used. Due to the change the balance shaft has been eliminated, further reducing parasitic power loss through friction while reducing moving parts and therefore long-term wear that could lead to future repair expenses.

The new V8 will debut throughout North America in the upcoming 2011 CL-Class this fall, with an announcement about which car will be first to integrate the revised V6 expected in the near future.

©(Copyright Canadian Auto Press)

Topics: Mercedes-Benz, Engine,

Organizations: Mercedes-Benz

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