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  • Air filter solution

    here's an idea for anyone that needs a new air filter is contemplating changing to pods.

    my filter died a while ago and was running some light foam in the original wire frame, but was not real successful.

    I made a bit of a change to my air box some time ago & have been running it to see how it goes before posting, riding hard, two-up , solo, round town, open easy hi-way, it has been 6 weeks since I made the change, when I said to see how it goes---well it goes, with a couple of $ out lay it's far less expensive than pods, and if you don't like it you've lost nothing

    http://members.webs.com/MembersB/edi...lbumid=7422200

    click on slide show ,full screen for best results

    the only thing I had to do was lift the slide needles up one.

    I hope this might help someone in the same situation as me-----cash strapped--[ I got the foam at a craft store]

    ************************************************** *******************************************
    Test Posting of photos and such in thread! Editted by TC.



    all you need is #1 some thick foam
    #2 gasket paper
    #3 stiff wire, I used bird cage wire
    #4 filter foam oil
    #5 scrap flat & 4 bolts



    The first of the wire plates has steps in it to clear the bolt mouldings,& if cut neat enough can also hold itself in place.



    In situ, it sits just inside the outer case while still sitting on the lip to stop getting sucked in during operation.



    The gasket paper was added after. I found the motor was either getting too much air, or the air flow was too turbulent under the box & needed calming down, the paper goes on after the wire, but before the foam.



    I used 25mm foam so when squashed down I still had the carbies running on constant velocity theory [ was still working for it's air ].



    Give the foam a good soaking in the oil.



    The easiest way I thought of to make the holes in the foam was to squash it down & use a light hammer to tap around the moulding until it cut thru the foam. Also when squashed, the foam filled in any small indiscretion in the cutting of the foam.



    The second of the 2 wire plates can now go over the foam.



    Some scrap pieces of flat make holding together easiest, measure & drill to suit.



    From the side ,anyone who knows what they are looking at will only notice the bottom of the air box is missing, everybody else wouldn't have a clue.
    never ride faster than your gaurdian angel
    can fly

    1981 rh 5N5
    MIDNIGHTSPECIAL
    1188cc
    4 into 1 pipes with a transac muffler,
    as the motorcycling gods intended everything else stock std

    http://s856.photobucket.com/home/steptoexs11
    http://steptoexs11.webs.com/
    http://www.youtube.com/my_videos?feature=mhum

    1982 vf750 sabre

  • #2
    Very creative...what did you do for the wire frames...was that a BBQ grill?

    Turned out nice!
    Guy

    '78E

    Quidquid latine dictum sit, altum videtur

    Comment


    • #3
      Very cool filter. In looking it over, seems you could even put the bottom back on it if you wanted to. Might just cut the filter media out where the snorkel would poke through and it would work the same.
      Life is what happens while your planning everything else!

      When your work speaks for itself, don't interrupt.

      81 XS1100 Special - Humpty Dumpty
      80 XS1100 Special - Project Resurrection


      Previously owned
      93 GSX600F
      80 XS1100 Special - Ruby
      81 XS1100 Special
      81 CB750 C
      80 CB750 C
      78 XS750

      Comment


      • #4
        looked it over again...aha...bird cage!
        Guy

        '78E

        Quidquid latine dictum sit, altum videtur

        Comment


        • #5
          Hey Steptoe,

          I editted your post, including the photos and notes from your website into the actual thread/post.

          A few comments: Without the bottom of the airbox, you've essentially made the snorkel inoperative, that's why it was running a bit leaner.

          Also, without the bottom, you could essentially put a plate over the snorkel opening in the box, because the carbs are getting filtered air directly thru the rest of the box thru the remaining filter material around the rest of the bottom.
          T.C.
          T. C. Gresham
          81SH "Godzilla" . . .1179cc super-rat.
          79SF "The Teacher" . . .basket case!
          History shows again and again,
          How nature points out the folly of men!

          Comment


          • #6
            I don't know how you do it

            I can't make it work that's why every thing goes to my site but thanks T.C, me and these computers ,
            [ I know more about space travel & the time continuam portals ]

            if you look at the second pic of the foam you'll see the intake funnel is pressed into the foam as well,so I would think all the air would be being drawn from underneath the box.

            I was just thinking to, any one who is very particular in their tuning could increase or decrease the amount of air intake by the size of hole in the paper
            never ride faster than your gaurdian angel
            can fly

            1981 rh 5N5
            MIDNIGHTSPECIAL
            1188cc
            4 into 1 pipes with a transac muffler,
            as the motorcycling gods intended everything else stock std

            http://s856.photobucket.com/home/steptoexs11
            http://steptoexs11.webs.com/
            http://www.youtube.com/my_videos?feature=mhum

            1982 vf750 sabre

            Comment


            • #7
              The wires over the snorkel hole probably let some raw unfiltered air in. I would think it better to clip the grid so the foam can seal against the opening of the snorkel hole.

              This looks to have some great potential.
              Ich habe dich nicht gefragt.

              Comment


              • #8
                OK, is this because you lost the lower half of the filter box?
                New filters are 18-20 bucks online with a permanent K+N 40 something.
                Appreciate any innovation, for these old bikes, but don't see any advantage
                over keeping the bike stock.
                John
                Now: '78 XS1100E 750 FD Mod (Big Dog)
                '81 CB900C ( 10 Speed)
                '78 CB750F ( The F)
                '76 CB400F ( The Elf)
                New '82 Honda MB5 Ring Ding
                Then: '76 CB550K
                '78 CB750F
                '84 VF1100S
                And still Looking!

                Comment


                • #9
                  The bottom of the box is in one of the pics. Bike bandit sells replacements for $14.41.
                  Harry

                  The voices in my head are giving me the silent treatment.

                  '79 Standard
                  '82 XJ1100
                  '84 FJ1100


                  Acta Non Verba

                  Comment


                  • #10
                    Originally posted by Bigfoot View Post
                    The bottom of the box is in one of the pics. Bike bandit sells replacements for $14.41.
                    Yes I went back through the pics and found it...With a filter installed.
                    I don't do business with BB. Looked around a bit and 18-20 seems about average. So, once again, What's the point?
                    John
                    Now: '78 XS1100E 750 FD Mod (Big Dog)
                    '81 CB900C ( 10 Speed)
                    '78 CB750F ( The F)
                    '76 CB400F ( The Elf)
                    New '82 Honda MB5 Ring Ding
                    Then: '76 CB550K
                    '78 CB750F
                    '84 VF1100S
                    And still Looking!

                    Comment


                    • #11
                      reason why

                      JJ,, it initially started because of an old filter,, was toying with the idea of pods and any other ideas, when I saw the foam in my cupboard I have been saving for a "rainy day", looked at it, looked at the air box and thought why not?, but how? . so I sat down, looked at it, rattled the grey matter for a while and this is what I came up with.
                      wasn't sure that it would work, but it does & works well

                      Ivan, just went back & had a look at the photo of the foam with the indents,,if raw air were to be an issue I suppose a chunk of foam in the intake funnel would eliminate that, although the foam around the wire is a very close fit.

                      like I said before, have a go, if you don't like it you've lost nothing

                      over the last 6 to 8 weeks I've been keeping a close eye on all things air,& every thing behind the foam is still squeeky clean, I ride on agricultural roads so there is some dust stirred up while riding.
                      never ride faster than your gaurdian angel
                      can fly

                      1981 rh 5N5
                      MIDNIGHTSPECIAL
                      1188cc
                      4 into 1 pipes with a transac muffler,
                      as the motorcycling gods intended everything else stock std

                      http://s856.photobucket.com/home/steptoexs11
                      http://steptoexs11.webs.com/
                      http://www.youtube.com/my_videos?feature=mhum

                      1982 vf750 sabre

                      Comment


                      • #12
                        Sorry, I didn't mean to sound like a AH.
                        Just one of my HBT's, is non stock mods to my bikes. (Or as it turns out lately,
                        others bikes too).
                        Carry on.
                        Have a nice day.
                        John
                        Now: '78 XS1100E 750 FD Mod (Big Dog)
                        '81 CB900C ( 10 Speed)
                        '78 CB750F ( The F)
                        '76 CB400F ( The Elf)
                        New '82 Honda MB5 Ring Ding
                        Then: '76 CB550K
                        '78 CB750F
                        '84 VF1100S
                        And still Looking!

                        Comment


                        • #13
                          she'll be right mate

                          nothing taken the wrong way, I'm always reading these posts wrong, I get halfway thru a reply & find I've misread something. I find I have to scrap the reply & re-read
                          never ride faster than your gaurdian angel
                          can fly

                          1981 rh 5N5
                          MIDNIGHTSPECIAL
                          1188cc
                          4 into 1 pipes with a transac muffler,
                          as the motorcycling gods intended everything else stock std

                          http://s856.photobucket.com/home/steptoexs11
                          http://steptoexs11.webs.com/
                          http://www.youtube.com/my_videos?feature=mhum

                          1982 vf750 sabre

                          Comment

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