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    • Kotte-Performance recommends pinning your N54 block past 25 psi of boost

      You obviously know the N54 block is an open deck design. Eventually and under great pressure, the cylinders can oval. Kotte-Performance claims this happens past 25 psi of boost but of course this depends on mileage, boost, torque, use, etc.


      Many BimmerBoost users routinely run past 25 psi on the factory block. That does not mean they will not eventually need to reinforce their cylinder block.

      Kotte-Performance uses pins to strengthen the cylinders:


      Is that as effective as a true CNC closed deck block conversion such as what @alex@ABRhouston offers? No.

      It is a cheap way to keep the cylinders from rounding that is often applied in the import world especially with Subaru motors.

      Can it work? Sure. Once again, it depends on the setup and use. Ultimately you will want to discuss with your engine builder what approach is best for your car and budget.




      This article was originally published in forum thread: Kotte-Performance recommends pinning your N54 block past 25 psi of boost started by Sticky View original post
      Comments 2 Comments
      1. subaru335i's Avatar
        subaru335i -
        I would say inserting dowels like this to support the cylinder is more common in the Honda world than Subaru. Pretty much everyone with a subaru with any kind of power goes to a full closed deck block, Ive only seen a couple put dowels in there.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by subaru335i Click here to enlarge
        I would say inserting dowels like this to support the cylinder is more common in the Honda world than Subaru. Pretty much everyone with a subaru with any kind of power goes to a full closed deck block, Ive only seen a couple put dowels in there.
        Perhaps as it does happen more often with imports but the point ultimately is there are options for your budget.

        You can even go up to this: https://www.boostaddict.com/content....block-from-IAG