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    • N54 DIY (do it yourself) Walnut Blast and Intake Valve Carbon Cleanup

      It is well known that carbon buildup can become an issue on N54 motors. With cars getting up there in mileage and changing hands several times it is more important than ever to make sure carbon buildup is not having a negative effect on performance.


      This handy DIY (do it yourself) instructs you on how to go about doing a walnut blast and cleaning:

      I finally set aside some time to give my 335i the walnut blast it deserved at 140k miles. I want to share my process/results!




      Here are the supplies I used:


      Here are the steps I took to get to the valves...

      Step 1: https://bit.ly/2JvZ98O
      Step 2: https://bit.ly/2Yn6rQr
      Step 3: https://bit.ly/309uSCo
      Step 4: https://bit.ly/309komL

      Let's get started...










      Well, I think I figured out why the car couldn't eclipse 13's in the 1/4 mile! I couldn't believe what I found after removing the intake manifold!


      After loosening up some of the carbon with a pick...




      Then after one pass of walnut blasting...
      (see video at the bottom for a detailed explanation of how to do this part)


      Lots of walnuts and manual scrubbing later...


      I even cleaned up the intake manifold ports because those were caked with carbon as well. You can see the cleaned port on the left and the dirty port on the right.


      It was a lot of work, but totally necessary. If you want to watch my whole process with more of a DIY/How-To style, check out my YouTube video. It also has some more information and a drive at the end showing the power increase/restoration.


      I hope this helps other N54 enthusiasts!

      This article was originally published in forum thread: How-To Walnut Blast/Carbon Clean Intake Valves started by suspenceful View original post
      Comments 5 Comments
      1. Sticky2's Avatar
        Sticky2 -
        This is well done. Need to edit the formatting a bit but definitely front page worthy.
      1. Sticky's Avatar
        Sticky -
        Promoted to front page with intro:

        It is well known that carbon buildup can become an issue on N54 motors. With cars getting up there in mileage and changing hands several times it is more important than ever to make sure carbon buildup is not having a negative effect on performance.

        This handy DIY (do it yourself) instructs you on how to go about doing a walnut blast and cleaning:

        Click here to enlarge
      1. langsbr's Avatar
        langsbr -
        Jake, I was curious, do you always use the gravity hopper blasting kit when you do these, or was it specifically for your budget build? I would think you'd have access to an air compressor and the harbor freight 20lb abrasive blaster is much better to use vs. the gravity hopper one. It's much more powerful as well, and not much more expensive. I didn't do any manual scrubbing on mine to get them spotless, plus each port took less than a minute of blasting.
      1. 7plagues's Avatar
        7plagues -
        god bless it, that was longggggg over due for that poor car! good on you taking it away from a home of neglect!
      1. suspenceful's Avatar
        suspenceful -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        Promoted to front page with intro.
        Sweet - thanks!

        Click here to enlarge Originally Posted by langsbr Click here to enlarge
        Jake, I was curious, do you always use the gravity hopper blasting kit when you do these, or was it specifically for your budget build? I would think you'd have access to an air compressor and the harbor freight 20lb abrasive blaster is much better to use vs. the gravity hopper one. It's much more powerful as well, and not much more expensive. I didn't do any manual scrubbing on mine to get them spotless, plus each port took less than a minute of blasting.
        I initially bought this kit to try it out and just haven't got around to upgrading it. I recently found out about the 20lb abrasive blaster kit and how much better it is. I'd recommend that for someone who might be doing this more than once for sure. If I do it again, I'll grab that kit to try next time.

        Click here to enlarge Originally Posted by 7plagues Click here to enlarge
        god bless it, that was longggggg over due for that poor car! good on you taking it away from a home of neglect!
        For sure! I'm excited to keep tearing into it.