Mark's Catch Tank

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  • Mark Halligan
    S2Forum Fiend
    • Jul 2003
    • 2001
    • Country: England

    #31
    Blimey!

    Just got back from a couple of days away on a course with work, so much to read!!

    Doug,

    Basically I removed all of the original breather pipes and hoses from the
    engine and I mounted the Mocal unit on the strut brace bar. The Mocal has two
    inlets and I connected one of these to the main breather outlet on the left
    side of the block (looking forwards). The other I connected to the rear of
    the cam cover, the one to connect to here is the smaller one that is lower down on the cam covers rear, as this
    carries the crankcase pressure, the top one is just a transfer pipe to carry the crank fumes to the front of the engine for ingestion by the inlet, in the OEM configuration.

    As I found that there was quite a bit of oil being 'puked' up into the can, I therefore decided to replace the cans drain plug with another line that travels down to a modified sump plug to drain the oil back to the sump. It is important that the oil drains back to the sump below the oil level as if it is not, crankcase pressure will also travel up this hose and the oil will not drain back while the motor is running.

    Additionally the cap that comes fitted the Mocal is breathable to allow the fumes to exit the system, this is obviously absolutely essential.

    I found that these were entering the car from the engine bay via the ventilation system so I replaced the cap with an adapter and connected it to a hose that vents the fumes to atmosphere through the inner wing to the wheel arch through a small K&N type filter, this is hidden by the wheel arch liner. This solution I am told is legal but you may want to divert the fumes after separation to the intake boot as in OEM configuration to be disposed of by ingesting into the inlet. If you decide that this is the way you want to do it, it would be better to use the cyclone type separator as this uses a centrifugal type action to separate the fumes from any oil, but be aware that these fumes will still carry suspended oil droplets in them and the only way to ensure a CLEAN inlet charge is to vent to atmosphere, or to the exhaust downpipe like Bigtoe has posted, that looks interesting but I have'nt had a chance to read it properly yet as I have only just sat down at the PC.

    I used all aeroquip type fittings and stainless braid hoses on the installation, but thats just because I'm a tart for shiny things.

    You could of course use normal type hoses with no loss of performance as the system is basically low pressure and it would also be much cheaper to do that way.

    Cheers Mark.
    Attached Files
    Mark - Modded

    Comment

    • Mark Halligan
      S2Forum Fiend
      • Jul 2003
      • 2001
      • Country: England

      #32
      Connection to sump plug:
      Attached Files
      Mark - Modded

      Comment

      • Mark Halligan
        S2Forum Fiend
        • Jul 2003
        • 2001
        • Country: England

        #33
        Modified sump plug:
        Attached Files
        Mark - Modded

        Comment

        • audiman
          S2Forum Freak
          • Jul 2003
          • 4827
          • Country: United Kingdom

          #34
          Paul, N.I. Mots are a totally different set of rules to UK Mots. It may be that you do need a closed breather system over there. :confused:

          Not sure, but over here its OK
          sigpic
          Tom C - www.rcmr.co.uk
          Audi UR Quattro
          Audi 100 C3 2.0 5 cyl 115ps
          Audi S2 - 07k engine project aiming for 800ps
          Audi B5 RS4 645ps 911nm

          Comment

          • Doug_RS2
            S2Forum Possessed
            • Jul 2003
            • 3847
            • Home: Scotland Current: England

            #35
            So is this right now?
            Attached Files
            S2,RS2,S4 WB,RS4,S4 B8,RS6 C5,RS6 C6,R8

            Comment

            • Sweeper
              S2Forum Extremist
              • Jul 2003
              • 1317
              • Country: Latvia

              #36
              Doug: If the picture is correct you should work for Quattro and Audi Gmbh as manufacture costs reduction engineer
              Vadim.

              New engine (mechanical PKM head) , Alcon 332mm brakes , Pauter rods , Mahle pistons, GT30R , kw v2 sucpension , new exhaust. 608HP. For SALE !

              Comment

              • Mark Halligan
                S2Forum Fiend
                • Jul 2003
                • 2001
                • Country: England

                #37
                Doug,

                Yep, thats right, but I think I would keep all the old bits in a box somewhere .

                Mark.
                Mark - Modded

                Comment

                • Sweeper
                  S2Forum Extremist
                  • Jul 2003
                  • 1317
                  • Country: Latvia

                  #38
                  Mark: Isn't 20V_krummer list has a detailed sheme and pictures of Cyclone in their files section ?

                  You should look more at http://autos.groups.yahoo.com/group/...ruemmer/files/

                  At "Breather Sys" Directory and "Crank_bre_....ppt" and "Crank_breath...ppt" files.

                  Guess this helps.
                  Vadim.

                  New engine (mechanical PKM head) , Alcon 332mm brakes , Pauter rods , Mahle pistons, GT30R , kw v2 sucpension , new exhaust. 608HP. For SALE !

                  Comment

                  • Mark Halligan
                    S2Forum Fiend
                    • Jul 2003
                    • 2001
                    • Country: England

                    #39
                    Bigtoe,

                    Thats brilliant mate, gonna definately try that, I remember reading a thread on Kruemmer, here:


                    Which mentions the benefits regarding power increases gained by creating a vacuum within the crankcase.
                    Oh well more to do
                    Does anyone have an idea of what type of one way valve could be used?

                    Mark.
                    Mark - Modded

                    Comment

                    • Dr H
                      S2Forum Extremist
                      • Jul 2003
                      • 1175
                      • Country: England

                      #40
                      ****** 'ell you can get rid of all that plumbing!
                      That might be an idea for any S2 monster power or not.

                      Also less hoses to leak
                      Ex 1994 Avant - now driving a Lotus 340r

                      Comment

                      • Doug_RS2
                        S2Forum Possessed
                        • Jul 2003
                        • 3847
                        • Home: Scotland Current: England

                        #41
                        Originally posted by Mark Halligan
                        Yep, thats right, but I think I would keep all the old bits in a box somewhere .
                        Good - getting somewhere now - Next question is the pipe that connects to hose number 23 in the pic - what is that and what have you done with that? (blocked it off?)

                        What is that thing that is connected to the t of the t-piece 21?
                        S2,RS2,S4 WB,RS4,S4 B8,RS6 C5,RS6 C6,R8

                        Comment

                        • Josh-stateside
                          S2Forum Maniac
                          • Jul 2003
                          • 741
                          • Country: United States

                          #42
                          Doug

                          Carbon canister vavle connects to 21

                          The vacumn line on the intake manifold connects to 23

                          Cheers
                          Josh
                          I chose not to choose life: I chose something else. And the reasons? There are no reasons. Who need reasons when you've got quattro?

                          Comment

                          • Doug_RS2
                            S2Forum Possessed
                            • Jul 2003
                            • 3847
                            • Home: Scotland Current: England

                            #43
                            Originally posted by Josh-stateside
                            Carbon canister vavle connects to 21
                            Cheers Josh - is this the thing that is connected to the fuel tank and vents extra pressure into the intake system? What happens to this then? I wouldn't have thought you would block this or vent it to atmosphere.


                            The vacumn line on the intake manifold connects to 23
                            Just block this pipe then?
                            S2,RS2,S4 WB,RS4,S4 B8,RS6 C5,RS6 C6,R8

                            Comment

                            • Josh-stateside
                              S2Forum Maniac
                              • Jul 2003
                              • 741
                              • Country: United States

                              #44
                              I don't know the technical sides of motronic to comment on this enough yet, but I have been reading:


                              " you may that the evaporative fuel control system stores fuel vapors in a charcoal canister to be drawn into the running engine upstream of the throttle...."


                              I don't think you can "ditch" it, but like I said currently above my knowledge known.
                              I chose not to choose life: I chose something else. And the reasons? There are no reasons. Who need reasons when you've got quattro?

                              Comment

                              • Mark Halligan
                                S2Forum Fiend
                                • Jul 2003
                                • 2001
                                • Country: England

                                #45
                                Doug,

                                I have left it connected to the inlet manifold and blocked the outlet that would have been connected to the crankcase ventilation pipe (this would have gone to the intake boot). This has caused me no problems, but I will probably connect the blocked off end to the intake again at some point in the future.

                                Link here explaining how it works:



                                With the solenoid outlet blocked, the connection to the inlet manifold fitted with a one way valve (to stop the fuel tank being pressurised during boost conditions in the IM) will still vent the carbon cannister.

                                Mark.
                                Mark - Modded

                                Comment

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