Officially Official: The new direct injected, multi-spark V6 and V8 engines from Mercedes-Benz
Filed under: Technology, Mercedes-Benz
Mercedes-Benz has officially released all the details on its new family of V6 and V8 engines due to launch this fall in the S-Class sedans and CL coupes. The new power-plants are adopting many of the same technologies increasingly being used by most automakers to reduce fuel consumption while maintaining or even improving output. Both the 3.5-liter V6 and the 4.7-liter V8 now feature direct fuel injection with the same type of piezo-electric injectors used on the latest diesel engines.
The combination allows more precise fuel delivery as well as a charge cooling effect. The cooling effect allows the use of higher compression and boost on the turbo V8 which significantly increases torque output. The V8 is rated at 429 horsepower with 516 pound-feet of torque between 1,800 rpm and 3,500 rpm.
The direct injection also allows the use of a variety of different combustion operating modes since multiple injection pulses per cycle can be executed. A new feature of this engine includes what Mercedes calls “multi-spark ignition” – new ignition coils that recharge much faster and putting out up to four sparks within one millisecond. Doing this can result in more controlled and complete combustion for lower emissions and consumption.
The ignition and injection systems also contribute to the direct-start auto stop-start system. Like Mazda’s i-Stop system, the piston that is in the best position can be directly fired to help re-start the engine, while ancillary components, like variable displacement oil pump and multi-phase cooling, help reduce parasitic losses.
The new V6 goes from a 90 degree bank angle to a 60 degree angle which makes the engine naturally balanced. This has allowed Mercedes to eliminate the balance shaft, further cutting internal friction. The new V8 debuts this fall on CL-class in the U.S., however Mercedes-Benz hasn’t announced when the V6 will arrive Stateside.
Update: Mercedes USA spokesman Rob Moran has confirmed that both the CL and S-class models in the U.S. will get the new twin turbo V8 in Q4 of this year with other models getting it in 2011. Models currently powered by a V6 engine will get the new V6 beginning in 2011.
[Source: Mercedes-Benz]
Officially Official: The new direct injected, multi-spark V6 and V8 engines from Mercedes-Benz originally appeared on luxuryinvietnam on Fri, 07 May 2010 17:57:00 EST. Please see our terms for use of feeds.
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