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The all-new twin-turbocharged 5.5-liter V8 may be Mercedes-Benz's AMG division's much-heralded pride-and-joy engine, but it certainly won't find a home under the hood of every single AMG product. To that point, AutoWeek reports that Mercedes-Benz is working on a naturally aspirated version of the 5.5-liter V8, slated for use not only in the refreshed SLK55, but in the AMG-fettled version of the C-Class coupe, the C55.

This new mill is claimed to produce around 422 horsepower – 62 more than what's currently available in the SLK55. New technologies like a cylinder cut-off mechanism will help improve fuel consumption while still sending a larger helping of power to the car's rear wheels.

AutoWeek also reports that while the upcoming C55 AMG coupe (and its hardcore Black Series version, which is rumored to be in the cards) will use this new 5.5-liter mill, the four-door C63 AMG sedan will retain the 6.2-liter free-breathing V8 that we currently enjoy, and that's just fine by us.

[Source: AutoWeek | Image: Drew Phillips/Autoblog/AOL]

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    • 1 Second Ago
      • 4 Years Ago
      i say this autoweek report is probably total bs it just doesn't make any sense. If the C63 coupe is getting the 5.5 NA V8 with only 420 hp why would the sedan still have the 6.3 with 450hp. I have never seen a coupe version of a sedan to have less power. However it does make sense if the new SLK amg recieve the 5.5 NA with around 420 hp since the SLK is quiet a bit lighter than the C63.

      Personally I think if they make a 5.5 NA amg engine it would have to make upward of 450hp. Just a remainder the current c63 amg with performance pack makes 480hp.
      • 4 Years Ago
      I am sorry, but I wholeheartedly disagree. The F/I engine needs to make it into EVERY SINGLE AMG model.

      In the words of Jeremy Clarkson: "Poowweeeeerrrrrrr!!!!"

      Seriously, who could say no to a 550+HP SLK with monster torque? I understand why MB is doing it, but I wish they weren't.
        • 4 Years Ago
        The C55 coupe needs to cost 50k or below to be competitive. At around 60k, there's is a E550 coupe which will possibly gets MB new V8 next model year (the one already in CL500 with 429hp). AMG always go with a large price premium, and although C55 is supposed to be a sporty car and E550 is just a boulevard cruiser... for the same money I would pick E550 coupe every single time.
      • 4 Years Ago
      I say AMG needs to get ahead of the curve...

      All people care about are HP and Torque figures... Now weight, MPG, and emissions also become a major part of the product line.

      If Porsche can continue to make 500hp out of a 3.6l 6cylinder like the one in the Porsche Turbo, or even the 600hp out of that 3.6l found in the GT2 RS...

      Mercedes at some point will do what Audi and BMW are doing with smaller FI motors replacing larger ones. I'm sure Mercedes could do something similar expecially in the smaller cars. And imagine AMGs lineup building of these.

      AMG could also do some amazing Diesels like the C30 which was highly sought after...
      • 4 Years Ago
      BMW turning into mercedes

      Mercedes turning into BMW
      • 4 Years Ago
      Our club met with the SLK product manager in October. Recap of what we were told to expect for the SLK here: http://www.slkworld.com/slk-r172-general-discussion/18489-recap-mbusas-r172-presentation-slkworld-retreat.html
      • 4 Years Ago
      For an AMG engine, that isn't overly impressive.

      Two quick examples :

      5.5L @ 422hp = 76.72 hp/L
      Mustang GT 5.0L @ 412hp = 82.4 hp/L
      Genesis V8 5.0L @ 429hp = 85.8 hp/L

      Come on, you are AMG and letting Ford and Hyundai with their regular engines out perform your V8?? Yes it will have torque, but displacement will help with that.
        • 4 Years Ago
        Costs are to blame. They need weak (at least for AMG standards) unit for SLK and instead of developing new one it's cheaper to re-work one of 5,5 engines they have (at least 3 different 5,5 constructions in merc line-up currently).
        Also, amg mercs have always been about effortless performance and spades of torque - it's easier to do with not much stressed unit.
        • 4 Years Ago
        @ rudyherfurth , AMG never was about hp/l, they value torque more. but they can build high rev, high hp/l engines, look at the AMG V12 in the Zonda.
      • 4 Years Ago
      That 5.5 should make more than 422 this is after all an AMG. If Ford can get 444 out of their 5.0 in the Boss surely AMG can match 88.8 hp/L Ford gets out of the boss.
      AMG 5.5L @ 422hp = 76.72 hp/L
      Ford Boss 5.0L @ 444hp = 88.8 hp/L
      • 4 Years Ago
      Not to Mention Ford's new 5.4L all aluminum SC version putting out a *conservative* 550HP...
      • 4 Years Ago
      These cars are the ones that throw more pollution to the atmosphere;Don`t purchase them.That`s an order!
      • 4 Years Ago
      It'll be interesting to see this AMG vs a new SRT8 with a 392.
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