airheads and water crossings.

Discussion in 'Airheads' started by Gimmeslack, Aug 18, 2008.

  1. Phreaky Phil

    Phreaky Phil Long timer

    Joined:
    Mar 18, 2006
    Oddometer:
    2,174
    Location:
    NEW ZEALAND
    This one would have drowned my Beemer. The DR just mader it and I had to drain water from the Airbox on the other side

    [​IMG]
    #61
  2. Phreaky Phil

    Phreaky Phil Long timer

    Joined:
    Mar 18, 2006
    Oddometer:
    2,174
    Location:
    NEW ZEALAND
    On a trip to Macetown ( An old gold mining town with 26 river crossings each way)I had thought about using some cut off pastic drink bottles cable tied over the snorkels, ( far enough forward to let the engine breath ) to deflect the bow wave water. We ended up just having a go, and drowned a 1200adv Beemer when he took a wrong line into waist deep water. They take ages to de- drown, so we only got about 8 crossings up.
    #62
  3. Prutser

    Prutser Long timer

    Joined:
    Aug 5, 2012
    Oddometer:
    1,338
    Location:
    The Dutch swamp
    I was thinking about putting something like this over the blue foam filters for the deep crossings to avoid water splashing in.
    [​IMG]
    #63
  4. Prutser

    Prutser Long timer

    Joined:
    Aug 5, 2012
    Oddometer:
    1,338
    Location:
    The Dutch swamp
    A filter that high would really help me ! But with the ST tank there is no room to get tubes there.
    I'm thinking of buying a second tank and weld some tubes through that can be connected to the airboxcover.
    #64
  5. Phreaky Phil

    Phreaky Phil Long timer

    Joined:
    Mar 18, 2006
    Oddometer:
    2,174
    Location:
    NEW ZEALAND
    They look as though they might do the trick on crossings where water is splashing over the engine or where its only briefly submerged.
    #65
  6. wiggins

    wiggins Adventurer

    Joined:
    Mar 8, 2006
    Oddometer:
    43
    Location:
    North Central, TX
    Didn't the BMW military sidecar rigs have the air filter inside the fuel tank with the air intake coming out of the top of the tank, I remember the top filter cover looking like a helmet????? A person could use a can big enough to hold the round BMW filters and add water drain holes outside of the filter area to drain the water out the bottom. You would lose some fuel volume but you would have the area were the airfilter use to sit to make an additional fuel tank or mount the battery in that position and then build the extra fuel tank were the battery use to sit. This would also be a good area to run the trans and rear end vents to keep them out of the water.:norton

    Seems like BMW had a good idea 60 years ago.
    #66
  7. chasbmw

    chasbmw Long timer

    Joined:
    Feb 19, 2006
    Oddometer:
    2,705
    Location:
    Bath Uk
    If you used a police fuel tank, the radio/toolbox compartment in the top of the fuel tank would be ideal for mounting e air filter
    #67
  8. hardwaregrrl

    hardwaregrrl ignore list

    Joined:
    Jan 26, 2006
    Oddometer:
    8,187
    Location:
    Atlanta
    I tried this and it wasn't allowing the engine to breathe enough. For the life of me I couldn't figure out why the bike was coughing at higher RPMs.....I am a dumb ass.
    #68
  9. Prutser

    Prutser Long timer

    Joined:
    Aug 5, 2012
    Oddometer:
    1,338
    Location:
    The Dutch swamp
    Interesting..... Do you know if they were against the intake manifolds ?
    I made a spring shaped thingy on the inside to keep them about 2" from the intake.

    But I still need to try them.
    #69
  10. gsd4me

    gsd4me 90% bluff

    Joined:
    Dec 11, 2005
    Oddometer:
    7,944
    Location:
    Brisbane, Australia
    Here`s what you need; fitted to early Dakar Rally BMW`s.

    [​IMG]
    #70
  11. hardwaregrrl

    hardwaregrrl ignore list

    Joined:
    Jan 26, 2006
    Oddometer:
    8,187
    Location:
    Atlanta
    I tried that, but just didn't have enough room between the backbone and the starter cover, so I just removed the springs and jammed the filters on the horns....it began pissing off some of the wires and yanking connections in opposite directions. Maybe I need to clean house.:D
    #71
  12. andyfrizzle

    andyfrizzle Adventurer

    Joined:
    Nov 28, 2011
    Oddometer:
    13
    Location:
    UK
    Prutser,

    Just a thought regarding water getting into the airbox.

    Had you considered fitting (or fabricating) an airbox similar to the one supplied by Moorespeed.

    [​IMG]
    You could fit a tube/pipe to where the air filter locates, then run your 'snorkel' to a higher point, then implement an air filter higher up.

    Or alternatively fabricate a cylindrical enclosure, into which the air filter sits, that is then welded to the top of the airbox, then run a 'snorkel' to a higher point on the bike.
    #72
  13. Airhead Wrangler

    Airhead Wrangler Long timer

    Joined:
    Mar 4, 2008
    Oddometer:
    6,839
    Location:
    Back in Seattle, FINALLY
    Refer to page 4:

    [​IMG]
    #73
  14. Prutser

    Prutser Long timer

    Joined:
    Aug 5, 2012
    Oddometer:
    1,338
    Location:
    The Dutch swamp
    The part i'm still thinking about is how to get from the top of the tank near the triple to the airbox using the ST tank. Without changing the looks to much. I might make a tube trough the tank that can be connected to the airbox.
    The filter and airbox is something for later, first i need to get through that tank.

    Fitting a filter in the tank is another option. Than i could remove the airbox and make another fuel tank on top of the gearbox. The weight would be lower on the bike and I might be able to store more fuel in the extra tank than i would loose by building an airbox in the main tank.

    Lots of things to think about but first i would like to fix the carb vent's and than work my way up.
    #74
  15. hardwaregrrl

    hardwaregrrl ignore list

    Joined:
    Jan 26, 2006
    Oddometer:
    8,187
    Location:
    Atlanta
    Ok, you guys are way more advanced on this subject so no laughing at my simple idea. I notice the rooney is still using the filter and airbox top with the clips, but got rid of the horns and came out the top. Can we not just seal around the base where the horns meet the top of the airbox and run flexible tubing off the ends of the horns and up to a filter near the steering neck?
    #75
  16. Phreaky Phil

    Phreaky Phil Long timer

    Joined:
    Mar 18, 2006
    Oddometer:
    2,174
    Location:
    NEW ZEALAND
    There is a lot of space under the right side of the tank there, where all the electrcal junk is and the coils are. If that stuff was moved a duct could be made so the intake is level with the top of the back bone of the frame and has a flexible duct to the existing filter setup ?? It wouldnt be quite as high as the Rooney setup but would be close.
    #76
  17. Prutser

    Prutser Long timer

    Joined:
    Aug 5, 2012
    Oddometer:
    1,338
    Location:
    The Dutch swamp
    The gearbox and finaldrive vents I made for my R80ST don't solve the problems I had with the oil getting milky.
    Each time I took the hoses off water came dripping out.
    The warm air coming out of the FD or gearbox condensates in the hoses and runs back into the fd or gearbox.

    In other threads I asked others about it, but nobody had that problem.
    I even asked a Dutch boxer guru about the gearbox breather he sells. He told me that there is always condensation in the hose and the oil still turns milky. (it must be the dutch wet conditions)

    Because of the deep river crossings I sometimes have to do I still like to keep the hoses.
    I made some double hoses with one side connected to the air intake.
    Now there is some constant airflow through the breather hoses and I hope this will take away the condensation.

    [​IMG]

    [​IMG]

    To test the airflow I kept a lighter in front of one hose and blew along the opening of the other hose.
    By doing this I could see the flame being sucked towards the hose.
    I hope this system will not suck out all my gearbox oil :D

    If this works the next thing will be to fix the carb vents.
    If someone has detailed pics of modified carb vents and could post them that would be great.
    #77
  18. igormortis

    igormortis Cafe Reise

    Joined:
    Dec 22, 2006
    Oddometer:
    1,504
    Location:
    London
    Great work, Bas. I'm waiting anxiously to see what you come up with for the carbs.

    *edit: How about using clear hose to see what's going on?
    #78
  19. Prutser

    Prutser Long timer

    Joined:
    Aug 5, 2012
    Oddometer:
    1,338
    Location:
    The Dutch swamp
    Didn't think about that. But would be a great option for a testing period.
    I will change them for clear ones.

    Thnx Igor.
    #79
  20. ed mocz

    ed mocz Kenosha WI

    Joined:
    Feb 21, 2008
    Oddometer:
    232
    #80