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Rover V8 + breather config (PCV?)

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    #31
    Make sure the engine is properly warmed up before making any adjustments of any kind! You may also have to run the engine with choke for longer whilst it is warming up due to the fact that the mixture at cold will be a good bit weaker with the PCV valve as Mr Vmad suggests.
    Worthwhile looking for the tappet chest vent as well.(at the rear of the engine drivers side (UK) below the valley gasket If that is open it will adversely affect the performance of the PCV valve. This one is plugged off

    [IMG][/IMG]

    Comment


      #32
      Originally posted by MissMoppet View Post
      PCV now fitted (see pic) from Real Steel. This is the one recommended by the TR7 forum for use with the SD1. BUT pops and backfires so that doesn't work. To remind anyone still awake I am just trying to replicate what was on an original SD1: one rocker cover breather with a flame trap which can be left open to air, the other via PCV to the PCV vacuum hose on my 4160 Holley. As you all know the SD1 had twin SUs with vac hose to one rocker cover. For some reason unfathomable to me it doesn't work with a Holley. BUT, but . . . there must surely be many other Stag engined RV8s + Holley out there: so please let me know you've arranged the breather pipes?
      [ATTACH=CONFIG]30555[/ATTACH]
      Dave


      The front right where the oil strained/filtered takeoff is, was to go the carby inlet.
      This "oil strained/filtered takeoff" is where I would have put the PCV and then feed that into the base of the carby.

      The "back firing/spitting and farting" sounds like something to do with the vacuum advance ie dissy advance or not at the incorrect time.

      As standard the 3500's had one vacuum inlet on the rear of the left rocker cover and one take off (to a constant depression are on the carby) on the right front rocker cover.
      This "take off (to a constant depression are on the carby) on the right front rocker cover" I would have used for a PCV going to the brass tube fitted on the heat insulator plate. ie between the carby base and inlet manifold spacer.
      Allan
      PS what PCV in the Austin/Rover original service manual?




      If you need any other pics I also have the parts manual
      Also both for the TR8
      Last edited by pagan; 22 October 2014, 08:16.

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        #33
        Originally posted by 73stagman View Post
        Make sure the engine is properly warmed up before making any adjustments of any kind! You may also have to run the engine with choke for longer whilst it is warming up due to the fact that the mixture at cold will be a good bit weaker with the PCV valve as Mr Vmad suggests.
        Worthwhile looking for the tappet chest vent as well.(at the rear of the engine drivers side (UK) below the valley gasket If that is open it will adversely affect the performance of the PCV valve. This one is plugged off

        [IMG][/IMG]
        Your motor?

        Did you drill the hole to let some oil drain back through the timing/cam chain case?
        Circled in red.
        9ef377d8-5b5b-49cd-bd57-598d57c1fb63_zpsb322083a.gif

        Allan
        PS
        that was in David Hardcastle's 3500 V8 book.
        Last edited by pagan; 22 October 2014, 09:02.

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          #34
          Yes.... I also gave the credit to David Harcastle back in post #5 and again since I think

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            #35
            Ok I should have read more before opening my trap

            Yours carby or injection?

            I always preferred the injection.

            Comment


              #36
              Originally posted by pagan View Post
              The front right where the oil strained/filtered takeoff is, was to go the carby inlet.
              This "oil strained/filtered takeoff" is where I would have put the PCV and then feed that into the base of the carby.

              The "back firing/spitting and farting" sounds like something to do with the vacuum advance ie dissy advance or not at the incorrect time.

              As standard the 3500's had one vacuum inlet on the rear of the left rocker cover and one take off (to a constant depression are on the carby) on the right front rocker cover.
              This "take off (to a constant depression are on the carby) on the right front rocker cover" I would have used for a PCV going to the brass tube fitted on the heat insulator plate. ie between the carby base and inlet manifold spacer.
              Allan
              PS what PCV in the Austin/Rover original service manual?




              If you need any other pics I also have the parts manual
              Also both for the TR8
              Thanks for all that. These pics are of course of EFi, mine is bog standard. The Rimmers page has all the bits but of course these are for twin SUs. There was no PCV used then: that was recommended to me because I'm using a Holley - inference being I presume because vacuum is stronger than with the old SUs. I'm trying to arrange a trip to specialist tuner soon: will report back.
              Halfords wipers, Turtle wax and shampoo - RV8 and a beautiful Rover 75 ("relax it's a Rover")

              Comment


                #37
                C'mon, you've been dying for an excuse to upload that immaculate pic: you could eat your dinner off those pots. Not sure about the hole. There are several around there. Easier to see in your pic with no valley than mine fully installed. I can poke a bit of wire about an inch into what I think is the same hole so presume it may be plugged.

                Dave
                Halfords wipers, Turtle wax and shampoo - RV8 and a beautiful Rover 75 ("relax it's a Rover")

                Comment


                  #38
                  Can't see how there would be a difference in vacum between SU's & Holley, it should be around 18psi for both systems. What may differ is the position of the takeoff, ie before or after the butterflies, or the size of orifice the vacum pipe connects to.

                  My engine is EFI and I have a PCV on the offside rocker, feeding to a catch tank with a 15mm pipe connected to the outer side of the butterfly valve. there is a small diameter pipe T'd off that pipe going to a small diameter takeoff on the inner side of the butterfly valve. There is a small filter on the nearside rocker which allows balance air into the engine. Regardless of what the PCV valve is doing I doubt any large volume of air is going through the small bore pipe.

                  John
                  Your wife is right, size matters. 3.9RV8

                  Comment


                    #39
                    SU vacuum is different from holley. SU is constant. Holley large tube is full manifold vacuum which is more severe and variable.

                    Comment


                      #40
                      After reading through this thread, I am so glad that I still have my original Stroms fitted

                      Keith

                      Comment


                        #41
                        Originally posted by jakesmig View Post
                        Can't see how there would be a difference in vacum between SU's & Holley, it should be around 18psi for both systems. What may differ is the position of the takeoff, ie before or after the butterflies, or the size of orifice the vacum pipe connects to.

                        My engine is EFI and I have a PCV on the offside rocker, feeding to a catch tank with a 15mm pipe connected to the outer side of the butterfly valve. there is a small diameter pipe T'd off that pipe going to a small diameter takeoff on the inner side of the butterfly valve. There is a small filter on the nearside rocker which allows balance air into the engine. Regardless of what the PCV valve is doing I doubt any large volume of air is going through the small bore pipe.

                        John
                        18psi? Lucky chap. I recently bought a vac gauge and I can't get more than 13 but I was told that the cylinders are all of good compression - but can't remember what. I am taking the hose to PCV off the correct outlet at least according to Holley US website.
                        Halfords wipers, Turtle wax and shampoo - RV8 and a beautiful Rover 75 ("relax it's a Rover")

                        Comment

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