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    • Maximum PSI offering forged S55 pistons and rods for F80 M3, F82 M4, and F87 M2 Competition

      Building BMW motors can be tricky but Maximum PSI worked out the kinks on their S55. The key to the forged piston package they offer is that Mahle made the pistons in an OEM style using the OEM coating and ring design. That means they can just drop right in.


      When people start to bore/sleeve and go to different rings and coatings that is when they tend to get into trouble by complicating things and straying too far from the factory design. These Mahle pistons work.

      Maximum PSI heavy duty forged piston set for S55 engines. Made by Mahle to our specifications. HD pins, Grafal coated skirts. Set up to drop in to the factory LDS bore. Rings are file fit.

      The rods are by Manley and apply to the S55 or N55 but you will not be able to use them with the factory pistons so it makes sense to do both the aftermarket pistons and rods at the same time.

      We teamed up with Manley Performance to create a heavy duty connecting rod set for the S55 and N55 BMW inline six cylinder engines. The factory components are quite capable, however we try to limit torque to around 600 ft/lbs on stock S55 engines. You can see the end result of pushing a factory connecting rod beyond those levels in the photo gallery. These rods are not compatible with OEM pistons. They are machined for aftermarket pistons with a non-tapered wrist pin/small end.



      Add a good S55 crank hub solution and your motor will be able to take a pounding.

      This article was originally published in forum thread: Maximum PSI offering forged S55 pistons and rods for F80 M3, F82 M4, and F87 M2 Competition started by Sticky View original post
      Comments 6 Comments
      1. Weehe's Avatar
        Weehe -
        So can these be purchased from Max PSI or they will only use them in engines built by them?
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Weehe Click here to enlarge
        So can these be purchased from Max PSI or they will only use them in engines built by them?
        Looks to me like you can purchase them and have whomever you want assemble your motor.
      1. maxnix's Avatar
        maxnix -
        Why not use the Mahle designed pistons? I wonder what PSI had changed for their pistons?

        Quite frankly, I am surprised we have not seen more builds with the Mahle forged.pistons.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by maxnix Click here to enlarge
        Why not use the Mahle designed pistons? I wonder what PSI had changed for their pistons?
        Maybe these are the Mahle pistons that Maximum PSI provided some input on?
      1. Jerain's Avatar
        Jerain -
        Mahle pistons, best quality you can get on Germans cars IMO...
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Jerain Click here to enlarge
        Mahle pistons, best quality you can get on Germans cars IMO...
        They supply OEM's so I'd have to agree. You go to them if you want it done right.