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    • Full BMW F87 M2 technical specs including N55B30T0 breakdown and comparison to S55/N54

      This is the BMW technical training document on the new BMW F87 M2 model. It is always fun to read BMW's own internal literature on models and this document is no different. Where it gets particularly interesting is around page 19.


      That is where BMW compares the N55B30T0 under the hood of the M2 to the S55 motor used in the F80 M3 and F82 M4 models as well as the N54 which is well known around these parts.

      It is interesting to note that the engines are all the same basic thing. They have the same firing order, same compression ratio, same bore x stroke, same number of valves per cylinder, same fuel injection, etc. It's all the same engine geometry and family.

      Despite BMW detailing in the document how the N55B30T0 shares the S55 pistons and many other parts they state the engine is a revised N55 from the F22 M235i. Considering it is a closed deck block design with S55 pieces it seems to be more of an S55 with the N55 turbo setup.

      It remains puzzling why BMW does not give the M2's motor an 'S' designation considering it shares so many S55 parts and is closer to the S55 design than the N55 design. Not to mention that it goes under the hood of an M car. Maybe BMW did not want to make it seem like the M2 is a cheaper M4? It's an odd decision when you read the details.

      Enjoy.










































































































































      This article was originally published in forum thread: Full BMW F87 M2 technical specs including N55B30T0 breakdown and comparison to S55/N54 started by Sticky View original post
      Comments 11 Comments
      1. RobNyc's Avatar
        RobNyc -
        What do you think Sticky ?
      1. KB's Avatar
        KB -
        Holy $#@!! I actually agree with @Sticky! Yes, the motor in the M2 is an "S" motor it just doesn't have the name. Is it because S55 was already taken? I don't know but I do think it's funny when people say it's exactly the same engine as the M235i...which it isnt...
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by RobNyc Click here to enlarge
        What do you think Sticky ?
        About...?
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by KB Click here to enlarge
        Holy $#@!! I actually agree with @Sticky!
        Glad to see you're catching on.
      1. KEMA's Avatar
        KEMA -
        So by extension same tuning potential as the M3/M4? Or am I missing something obvious?

        Ken
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by KEMA Click here to enlarge
        So by extension same tuning potential as the M3/M4? Or am I missing something obvious?

        Ken
        Well, you're missing the turbo setup is completely different as is the redline.
      1. KEMA's Avatar
        KEMA -
        Right. Thanks.

        Ken
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by KEMA Click here to enlarge
        Right. Thanks.

        Ken
        Maybe that's why they called it an N55 instead of S55. Who knows.
      1. RobNyc's Avatar
        RobNyc -
        Click here to enlarge Originally Posted by KB Click here to enlarge
        Holy $#@!! I actually agree with @Sticky! Yes, the motor in the M2 is an "S" motor it just doesn't have the name. Is it because S55 was already taken? I don't know but I do think it's funny when people say it's exactly the same engine as the M235i...which it isnt...
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        Glad to see you're catching on.
        Click here to enlarge Originally Posted by KEMA Click here to enlarge
        So by extension same tuning potential as the M3/M4? Or am I missing something obvious?

        Ken
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        Well, you're missing the turbo setup is completely different as is the redline.
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        Maybe that's why they called it an N55 instead of S55. Who knows.
        You both make valid points,
      1. inlineS54B32's Avatar
        inlineS54B32 -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        Maybe that's why they called it an N55 instead of S55. Who knows.
        I read through as much as I could - and noticed that the N55 engines doesn't have an "LDS" coating - not sure how the heck that makes a difference, but it looks like they actually had to use different piston rings for this:

        Adaptations were necessary on the first piston ring, the plain rectangular compression ring. This had to be adapted as regards the material pairing to a liner made of grey cast iron. This is in contrast to the S55 engine, where this is LDS-coated


        Anyone know why this would be? I thought LDS was just a friction-helper, but it's now making me wonder if it has an impact of total possible performance in some regard (heat?).

        Why they didn't just spray this on the inside of the block and call it what it is? Not sure.

        I am interested in this car.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by inlineS54B32 Click here to enlarge
        I read through as much as I could - and noticed that the N55 engines doesn't have an "LDS" coating - not sure how the heck that makes a difference, but it looks like they actually had to use different piston rings for this:
        Adaptations were necessary on the first piston ring, the plain rectangular compression ring. This had to be adapted as regards the material pairing to a liner made of grey cast iron. This is in contrast to the S55 engine, where this is LDS-coated


        Anyone know why this would be? I thought LDS was just a friction-helper, but it's now making me wonder if it has an impact of total possible performance in some regard (heat?).

        Why they didn't just spray this on the inside of the block and call it what it is? Not sure.

        I am interested in this car.
        I don't understand what the hell BMW is doing honestly. Sometimes they just throw logic to the wind.