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    • Mercedes to launch 53 AMG models with 430+ horsepower turbo 3.0 liter M256 I6 variant

      Mercedes-AMG is going to squeeze another model in between the 43 and 63 AMG vehicles. The upcoming 53 AMG's are expected to utilize a variant of the M256 turbocharged inline-6 engine architecture.


      This is a new modular engine family. The E53 AMG coupe for example is expected to make about 430 horsepower. It should also make for an interesting tuning platform unless AMG goes out of their way to lock tuners out.

      It will also be interesting to note what role the electric compressor plays and if it will be possible to overspin it.


      Engine M 256 M 276
      No. of cylinders/arrangement 6/in-line 6/V
      Displacement per cylinder cc 500 499
      Displacement cc 2999 2996
      Cylinder spacing mm 90 106
      Bore mm 83 88
      Stroke mm 92.4 82.1
      Bore/stroke 1.11 0.93
      Connecting rod length mm 140.5 148.5
      Rated output kW/hp over 300/408 245/333
      Peak torque Nm over 500 480
      Compression ratio 1: 10.5 10.5

      This article was originally published in forum thread: Mercedes to launch 53 AMG models with 430+ horsepower turbo 3.0 liter M256 I6 variant started by Sticky View original post
      Comments 11 Comments
      1. subaru335i's Avatar
        subaru335i -
        yayyy more I6's. I still love that architecture and Im glad they are branching out from the damn V6 motors.
      1. Stevenh's Avatar
        Stevenh -
        Unfortunately, compared to the V6, its gone from over square to hugely under square. Hopefully its not a total tank engine.
      1. Sticky2's Avatar
        Sticky2 -
        Click here to enlarge Originally Posted by Stevenh Click here to enlarge
        Unfortunately, compared to the V6, its gone from over square to hugely under square. Hopefully its not a total tank engine.
        Soooo.... The BMW approach.
      1. BLKROKT's Avatar
        BLKROKT -
        Holy $#@!, talk about diluting the brand. So much for the "one man, one engine" philosophy.

        It's just a matter of time until they start calling these "AMG Sport" models, then stuff even more AMG-variants in wherever they can.

        The nomenclature doesn't even make sense anymore - 43, 53, 63 don't mean a thing.

        Such a shame.
      1. subaru335i's Avatar
        subaru335i -
        Click here to enlarge Originally Posted by BLKROKT Click here to enlarge
        Holy $#@!, talk about diluting the brand. So much for the "one man, one engine" philosophy.

        It's just a matter of time until they start calling these "AMG Sport" models, then stuff even more AMG-variants in wherever they can.

        The nomenclature doesn't even make sense anymore - 43, 53, 63 don't mean a thing.

        Such a shame.
        Copy cats. BMW did it first
      1. LessIsMore's Avatar
        LessIsMore -
        Click here to enlarge Originally Posted by Stevenh Click here to enlarge
        Unfortunately, compared to the V6, its gone from over square to hugely under square. Hopefully its not a total tank engine.
        Manufacturers are overwhelmingly going to 500CC/cyl architecture due to the way regulations and emissions rules are written. That' why everything is so cookie-cutter these days i.e. 2.0L I4's, 3.0L V/I6's, 4.0L V8s, etc.

        Also why you see turbochargers on everything - it's become the best way to successfully navigate the myriad global emissions regs.

        Undersquare engines are good for torque, which makes sense for drivability down low when engine is off- or low-boost, keeping general consumers happier by masking lag a bit.

        Car & Driver did an informative article on it a while back, might be online.
      1. 93siro's Avatar
        93siro -
        Main benefit of undersquare engines are efficiency. Less area shared with head means less heat loss. The biggest drawback is small valves.
      1. Sticky2's Avatar
        Sticky2 -
        Click here to enlarge Originally Posted by 93siro Click here to enlarge
        Main benefit of undersquare engines are efficiency. Less area shared with head means less heat loss. The biggest drawback is small valves.
        Don't forget compact packaging. Well, for an I6.
      1. BlackJetE90OC's Avatar
        BlackJetE90OC -
        Wait, I thought I had read this is replacing all 43 models. Not adding an additional AMG model?
      1. subaru335i's Avatar
        subaru335i -
        Click here to enlarge Originally Posted by 93siro Click here to enlarge
        Main benefit of undersquare engines are efficiency. Less area shared with head means less heat loss. The biggest drawback is small valves.
        Was going to write this exactly.
        Positives of undersquare are torque and efficiency.
        Negatives are small valves and high piston speeds (low redline) but the low redline unusually doesn't matter as much because the small valves cant breathe up high anyway.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by BLKROKT Click here to enlarge
        Holy $#@!, talk about diluting the brand. So much for the "one man, one engine" philosophy.

        It's just a matter of time until they start calling these "AMG Sport" models, then stuff even more AMG-variants in wherever they can.

        The nomenclature doesn't even make sense anymore - 43, 53, 63 don't mean a thing.

        Such a shame.
        Great post.

        I don't know why they are watering AMG down. Didn't they learn from what BMW M did?