Oil Pump hack

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  • mllen89
    S2Forum Fanatic
    • Apr 2015
    • 63
    • Country: United Kingdom

    #1

    Oil Pump hack

    Hi
    I have seen some block off the oilreturn to gear, after relifvalve, then bore a hole in block.

    Seaching some info on that, do people just bore straight in or make a pibe to sump, or what ?

    Thanks
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  • Kiku
    S2Forum Addict
    • Aug 2010
    • 497
    • Country: Estonia

    #2
    Dont seem to understand the benefit on that, because that is not a problem when you use wetsump(original) solution. More beneficial hack is to modify the head with rerouted oil supply, strong gear to oil pump (Findland, Sweeden has those?!) and baffle to the sump (Alex - Error404) can help with that.
    1990 2.2 20VT Audi Coupe Quattro
    *Hx35/k26, MaxxECU, Wagner EM/IC *RS2 Recaro *4pot-Brembo *3" turboback *Treser *Koni/H&R
    1990 Audi 200 20v Avant 2.2 20VT *7 Seater *Full electric gizmos

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    • mllen89
      S2Forum Fanatic
      • Apr 2015
      • 63
      • Country: United Kingdom

      #3
      If you gonna rev to 8000 or over, the relifvalve starts to be open all the time, then there is gonna be oilstarvation on oilpumpegears/house. then its game over,
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      • Kiku
        S2Forum Addict
        • Aug 2010
        • 497
        • Country: Estonia

        #4
        The situation happened on the picture above because of stock gear. With wetsump you rev the I5 till 8000max, over that then its your own fault if everything goes "Caput".

        If you build the oil feed straight to the head, then it will limit the oil feed to the head significantly and it will "help" the starvation problem. But over 8k rpm is crazy with wetsump...



        Last edited by Kiku; 4 May 2020, 14:28.
        1990 2.2 20VT Audi Coupe Quattro
        *Hx35/k26, MaxxECU, Wagner EM/IC *RS2 Recaro *4pot-Brembo *3" turboback *Treser *Koni/H&R
        1990 Audi 200 20v Avant 2.2 20VT *7 Seater *Full electric gizmos

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        • mac2226
          S2Forum Extremist
          • Jun 2008
          • 1289
          • Country: United Kingdom

          #5
          Stock pump is good enough if you don’t intend to rev it there all the time,If your going up into 8krpm all the time just use a accusump. Or dry sump

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          • mllen89
            S2Forum Fanatic
            • Apr 2015
            • 63
            • Country: United Kingdom

            #6
            oki i have cnc gears allready + dobble external oil bypass. so think it will be safe til rev it to 8000, else i will use acusump.

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            • PRY4SNO
              S2Forum Maniac
              • Mar 2009
              • 767
              • Country: Canada

              #7
              I thought the oil pump was limited to 8500 rpm before destructive harmonics started to crater the gears?
              2013 Touareg TDI /// #farmenwagen
              1992 80q 20v /// Eventual AAN'd Winter Sled
              1990 Cq /// Project: Because Racecar

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              • Error404
                Super Moderator
                • Mar 2007
                • 19789
                • Country: United Kingdom

                #8
                The elephant in the room is that at high rpm the pump scavenges the sump quicker than the oil drains back. You need more oil capacity and to improve drain back, limiting oil flow to the head (assuming you have mechanical valvetrain). You really need a dry sump system above 8k rpm or be prepared for failures - running components at their limit will never be reliable.
                Panthero Coupé quattro 20vt
                Indigo ABY coupé
                Imola B6 S4 Avant

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                • PRY4SNO
                  S2Forum Maniac
                  • Mar 2009
                  • 767
                  • Country: Canada

                  #9
                  Well put, thanks Alex. Everyone's definition of safe vs. limit is up for interpretation. One of those grains of salt to be employed when reading/learning online! 8k rpm is plenty anyways
                  2013 Touareg TDI /// #farmenwagen
                  1992 80q 20v /// Eventual AAN'd Winter Sled
                  1990 Cq /// Project: Because Racecar

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