Extreme AIRHEAD pics thread

Discussion in 'Airheads' started by chacodude, Aug 6, 2010.

  1. supershaft

    supershaft because I can

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    The clutch being pulled in clued me in that you were having a moment. A lot of people would of let that get out of hand completely IMO! Good save!
    #81
  2. Uncle Ernie

    Uncle Ernie Long timer

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    Wow. That conversion bike is -indeed- incredible. Any more pictures?

    Whoever asked about the R7, there was a fairly extnsive write up on it in the Vintage BMW Motorcycle Owners Club forum some time ago. Interesting that no one really knew it existed for sure because hints at it's existance where only artist renderings. It quite surprised many people when it was found in boxes.
    #82
  3. Airhead Wrangler

    Airhead Wrangler Long timer

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    I have trouble figuring out how they're driving those overhead cams. Must be a bunch of bevel gears involved there as well as an additional shaft over the crank to drive them? Lots of effort there. Anyone know who made these?
    #83
  4. pommie john

    pommie john Long timer

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    Maybe I'm a cynic, but there doesn't look like enough room for a cam on top of those heads.
    I reckon it's just cosmetic.
    #84
  5. Big John Sny

    Big John Sny Been here awhile

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    If it is cosmetic, they sure went through a lot of work to move the starter.
    #85
  6. Hawk Medicine

    Hawk Medicine Coyote's Brother

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    Yeah... I was thinking the same thing. why would someone go through all that trouble to build something that doesn't work?

    Photos of that bike have been floating around the internet for almost a decade/maybe longer, so one of our European members must know something about it.
    Maybe! :D
    #86
  7. Carl

    Carl ,,,

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    The BMW OHC bikes are functioning machines. There are several designs that have been done on the 1955-69 twins and also the 1970 & up engines.

    I saw and heard run the 70 & up versions some time ago in Germany. They seemed to be well thought out design modifications to the stock engine. Since those engines have the cam placed below the engine the design has some challenges. The pre-70 twin mod'd engines have plenty of room for the replacement geared shaft.

    Carl
    #87
  8. r50us68

    r50us68 Been here awhile

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    This might be an off road airhead
    [​IMG]
    #88
  9. bpeckm

    bpeckm Grin!

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    :freaky

    Wow... hafta talk to my local tap-man.....:lol3
    #89
  10. danedg

    danedg Horizontally Opposed

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    [​IMG]
    #90
  11. Kentucky

    Kentucky Long timer

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    Did anyone see the R7 at the Amelia Island Concourse this past weekend?
    #91
  12. mark1305

    mark1305 Old Enough To Know Better

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    Wow! That red BMW on the previous page is something else. :clap

    For those wondering about room in those heads for OHCs, if the bike does have Desmodromic valve gear as the decal implies, no valve springs. That saves a fair amount of space.

    The bevel drive above the cylinders - that is what puzzles me more.
    #92
  13. matteo

    matteo HPM

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    #93
  14. Airhead Wrangler

    Airhead Wrangler Long timer

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    Not really. You still need to have the valve stem protrude through the guide the full length of it's travel and additionally have room for the closing rocker under a collet midway down the stem. They might take even MORE depth than the standard BMW arrangement. I'm also curious how those cams are driven. I wonder if the cams, rockers, valves and shims are standard ducati parts.
    #94
  15. mark1305

    mark1305 Old Enough To Know Better

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    Agreed on what you're saying about the space. But the saving I'm referring to is what is gained by either not having to place the cam over the valve stems/springs, nor having to utilize traditional rockers between a cam and a valve. Desmo seems more compact to me, even if only by a little bit.

    Looking at that BMW head, it later occurred to me that it looks like the cam bearings may be smaller than Ducati cams, thus lowering the overall height of the head and valve cover slightly compared to a Duc. All my time was spent on 2V rubber band motors, though. I've never stuck my paws into a bevel head. Drooled on quite a few at the annual Daytona Ducati Days though. :D
    #95
  16. Beater

    Beater The Bavarian Butcher

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    #96
  17. Airhead Wrangler

    Airhead Wrangler Long timer

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    A friend of a friend is building something seriously rowdy for a trip to bonneville:

    Here's a hint:

    [​IMG]


    Uh oh...

    [​IMG]

    Maybe the fastest monolever G/S ever? We'll see.
    #97
  18. bgoodsoil

    bgoodsoil Dare to be Stupid

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    :lurk that's nowhere near enough info and you know it!
    #98
  19. MIOB

    MIOB Long timer

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  20. davorallyfan

    davorallyfan Commonist

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