Despite being a relatively new engine in the grand scheme of things, the curtain may soon close on the twin-turbocharged 5.5-liter V8 found under the hood of many Mercedes-Benz AMG cars. Speaking to Australia's CarSales.com, AMG chief Tobias Moers said that the engine, as fitted in the 2014 S63 AMG (pictured), is at its maximum state of tune, and that more power cannot be eked out without threatening reliability. This engine produces a massive 577 horsepower and 664 pound-feet of torque in the new S63.

The forthcoming S-Class coupe and convertible models are expected to get this same AMG treatment, though Moers did not confirm this, along with updated versions of the E63 and CLS63 AMG. But beyond this, the M157 twin-turbo V8 is not expected to appear in any new Mercedes products.

So, what's next? CarSales.com states that the AMG version of the next C-Class will use an all-new 4.0-liter V8 that will, essentially, be created by bonding two of the 2.0-liter turbo engines from the A45 AMG (or CLA45 AMG) together. This 4.0-liter mill is expected to power the new, sub-SLS sports car, dubbed SLC.

Beyond that, a hybridized version of the 4.0-liter V8 could arrive, since Mercedes-Benz has made it clear that electrification will play a key role in the future of AMG. As Moers told CarSales.com, "It's clear depending on the segment – large SUVs, S-Class, whatever – in the future they will be assisted by electric motors... but there is no decision done, it is a discussion that must be done."


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  • 29 Comments
      LW
      • 1 Year Ago
      577 hp out of a force induction engine? what's the internal of this engine made out of? Stamped iron?
      • 1 Year Ago
      [blocked]
        Eta Carinae
        • 1 Year Ago
        I would agree, but look at the results of the porshe 918 and tesla model S........there launch times are insane because of the low end torque.....if mercedes benz can implement such a system paired to there V8....let the electric part get you off the line and V8 howl through the rest.......
      theautojunkie
      • 1 Year Ago
      ....down-sizing the motor's displacement, and hybridization with electricity, not a news breaking idea.....
      graphikzking
      • 1 Year Ago
      That's very interesting. Nissan is pushing nearly the same hp out of their 3.8 liter V6 as this 5.5 V8. Ford is pushing 662 hp out of a 5.8 liter V8. Chevy is pushing 638 hp out of a 6.2 liter and that doesn't even use the "normal" DOHC setup of most import engines. I'm surprised that Mercedes can't coax another 45hp out of the engine. I do LOVE the idea of fusing 2 engines together and testing it. I don't think they can "double" the hp of the 4cylinder though because of heat. With 4 cylinders there is a lot more surface area to keep the engine cool. With 8 cylinders you now have a LOT of heat on the center 4 cylinders. This means they will have to detune it a bit and work big time on airflow around the engine. The A45 AMG produces roughly 346hp. x 2 = 692hp. I'd say probably 590 hp - 640hp.
        KaiserWilhelm
        • 1 Year Ago
        @graphikzking
        These AMG turbo v8's can be tuned up to 800-900hp before detonation begins, and thats without changing any physical parts!
      imag
      • 1 Year Ago
      It's interesting - I think I am an all or nothing person. In a big luxury vehicle, I would rather either have a big petrol motor - or - a true ground-up electric design, like the Model S. The hybrid option is fine for commuters, but I feel like a luxury flagship shouldn't have any of the hybrid quirkiness.
      Lenny_W.
      • 1 Year Ago
      The real MB AMG engine that needs to be axed it's the M275 V12 5.5 & 6.0. Instead of axing the M157; AMG Gmbh should make a version of M152 (SLK55) twin turbo. Utilizing COD (Cylinder on demand) on a M157. Thus no need to follow the downsize trend & can utilize so many existing engine components / eletronics / production process / etc. to save cost of retooling.
      mchica
      • 1 Year Ago
      http://www.gminsidenews.com/forums/f37/mercedes-benz-going-rebadge-nissan-pickups-134265/#post3021337
      Big_George
      • 1 Year Ago
      Someone needs to do their homework here, this same engine is fitted in the E63 S AMG with 585bhp and 800 nm of torque.
      NotenougHP
      • 1 Year Ago
      How reliable do you guys view a Renntech tune, and even more so a whole package from Renntech, given MB states more power threatens reliability?
        NightFlight
        • 1 Year Ago
        @NotenougHP
        Renntech has been around for years, they know what they are doing. A family friend has had a W220 S65 with Renntech's highest package that was installed immediately after it was bought new. He tracks it often and drives the hell out of it. It has been his DD since 2005 with 70,000 miles and no faults.
          • 1 Year Ago
          @NightFlight
          [blocked]
        LW
        • 1 Year Ago
        @NotenougHP
        there is the difference between reliable enough that engine repair warranty claims won't put a big dent on the their pocket. If there is a 5% engine failure within that period, and the rebuilt cost is $20k, that's an extra $1k cost to each car. Anecdotal evidence like nightflight's doesn't give a picture at all, let alone a big picture.
      CadiVetteFerrari
      • 1 Year Ago
      4.0 V8 engine? I wonder how it'll compare to Audi's...
      NotenougHP
      • 1 Year Ago
      My plans for 2012+ CLS/E63 are shattered, sticking with the C63 a little longer I guess.
      Brodz
      • 1 Year Ago
      But it just got here
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