Announcement

Collapse
No announcement yet.

4032 pistons and cylinder bore

Collapse
X
  • Filter
  • Time
  • Show
Clear All
new posts

  • 4032 pistons and cylinder bore

    Does anyone have any experience with these type of pistons in relation to the suggested cylinder bore so that we get absolutely right the ratio and don't end up with stuck pistons or too large bores?

    These have higher content of silicone and tend not to expand with heat as much as the 2618 type of pistons.

    While mahle original pistons have up to or more than 20% silicone and require 0.02mm bores, these pistons I have are about 14% silicone and according to the spec sheet(JE from what I gather but pistons are made by supertech) require minimum 0.05mm and maximum 0.08mm for 82mm pistons.

    Given an engine that will run max 2.5bar of boost(most likely 2bar) and be used even as a daily driver I'd like to get it right and have the minimum possible acceptable oil consumption.

    Would you go for the minimum of 0.05mm or add anything to that?

    I already have bought the standard oil ring set from JE with the help of AndyP which seems to reduce the oil consumption quite a bit.

    Your thoughts or experience would be most welcome

  • #2
    My friend has 0.07mm and runns 800+hp with Wössner's.

    Audi UrS4 Avant 2.5 20vt - twincharged - Project
    Audi 80q B4 Sedan 2.2 20vt - Daily user
    BMW 320d Touring e91 M-Sport - Daily user
    BMW 740iA e38 - Project

    Comment


    • #3
      Good info!
      How is his oil consumption? And did he have to do anything extra to improve on the bottom end blow by from such pistons?

      Comment


      • #4
        Oil consumption is not very different to a healty stock steup, close to zero. He runns breather to atmosphere with an oil separator with drain back to sump. Also my baffle plate in the sump. Breathes from the stock locations, from the block and the rear of the cam cover. For the drain there is an AN12 bung welded on the front section of the oil pan.

        Audi UrS4 Avant 2.5 20vt - twincharged - Project
        Audi 80q B4 Sedan 2.2 20vt - Daily user
        BMW 320d Touring e91 M-Sport - Daily user
        BMW 740iA e38 - Project

        Comment


        • #5
          That is very encouraging indeed!

          Comment


          • #6
            Thuppu THomas, Do you have picture of that bung, where is located on oil pan? Is that any tray to cover that hole from the splashing oil? Thanks
            Audi Coupe Quattro 2.3 20V

            Comment


            • #7
              Seems to be many different tastes of how to add the drain. I like to add it under the oil level and in the front part of the sump. I can't find a pic atm. But you can also do it like this:


              Audi UrS4 Avant 2.5 20vt - twincharged - Project
              Audi 80q B4 Sedan 2.2 20vt - Daily user
              BMW 320d Touring e91 M-Sport - Daily user
              BMW 740iA e38 - Project

              Comment


              • #8
                Why not to use a OEM drain in tdi block?
                Audi Coupe Quattro 2.3 20V

                Comment


                • #9
                  What oem drain?

                  Audi UrS4 Avant 2.5 20vt - twincharged - Project
                  Audi 80q B4 Sedan 2.2 20vt - Daily user
                  BMW 320d Touring e91 M-Sport - Daily user
                  BMW 740iA e38 - Project

                  Comment


                  • #10
                    Audi Coupe Quattro 2.3 20V

                    Comment


                    • #11
                      Turbo drain? Yea, why not..? Only on wrong side, but with an custom setup could be done.

                      Edit. Or you mean the pipe on the sump? Sure, could be used. Not anything you see on gasoline version sumps.

                      Audi UrS4 Avant 2.5 20vt - twincharged - Project
                      Audi 80q B4 Sedan 2.2 20vt - Daily user
                      BMW 320d Touring e91 M-Sport - Daily user
                      BMW 740iA e38 - Project

                      Comment


                      • #12
                        Green circle...thats a OEM drain from turbo on 2.5 tdi block
                        Audi Coupe Quattro 2.3 20V

                        Comment


                        • #13
                          That is also existent on th short blocks. I assume plumbing there may be a bit more tricky for a catch tank to drain back. Also I think it's always better to drain under the oil level rather than above.

                          Comment


                          • #14
                            Is that any problem with marked location? OR what is benefit from location into oil pan (under the oil level)
                            Audi Coupe Quattro 2.3 20V

                            Comment


                            • #15
                              If you return the oil above the oil level once you start to get blow by you may have a reverse flow of oil to the catch tank. You can solve that by using a one way valve though.

                              Comment

                              Working...
                              X