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Thread: Dave's new project

  1. #11
    Join Date
    Mar 2008
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    Beautiful Northern NM
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    12,283

    Re: Dave's new project

    For high speed use a deflector for the velocity stack helps top end. An open air stream running across the end of the stack is counterproductive.
    Friends help friends move,
    Real friends help friends move bodies!

  2. #12
    Join Date
    Oct 2009
    Location
    Snohomish, WA
    Posts
    433

    Re: Dave's new project

    Quote Originally Posted by Rubone View Post
    For high speed use a deflector for the velocity stack helps top end. An open air stream running across the end of the stack is counterproductive.
    Yep. The high-speed air across the opening produces a partial vacuum in the vel. stack. The term is Bernoulli Effect, I believe. It's the same idea that some of the cheapo soda blasters use -- compressed air across the end of a tube whose other end is embedded in the soda. The partial vacuum sucks up the soda, which then gets thrown onto the part being cleaned.

  3. #13

    Re: Dave's new project

    Quote Originally Posted by Mr. Big View Post
    Like your style there Dave. So what is a historic time trial?
    Its like a Hill Climb but without a hill.

    http://rogerboehme.wixsite.com/eddingtonsprints

    You're just timed down a piece of road and the fastest time wins. I'll post some pics.
    1938 WLDR
    1940 WL (Race Bike)
    1944 WL
    1976 FLH

    http://1944WL.webs.com

  4. #14

    Re: Dave's new project

    Quote Originally Posted by Fabe View Post
    There is more to a velocity stack than meets the eye. I had to have one for my hot rod FXR. It looked great. One day I was running the bike to Wendover, Nevada. I put my feet on the forward controls and didn't realize that my thigh covered up the velocity stack and inadvertently chocked the motor. If that wasn't bad enough, The carb puked a ton a gasoline onto my bluejeans. With no place to stop and rinse off the gas, I ended up with a little chemical burn and I stunk of 91 grade petrol. Not my best run to Wendover for sure. Your 45 looks pretty dang cool[/QUOTE]

    That's a great story Fabe......classic

    I get the tanks and stuff back this week so I'll post a pic when its all back together.
    1938 WLDR
    1940 WL (Race Bike)
    1944 WL
    1976 FLH

    http://1944WL.webs.com

  5. #15

    Re: Dave's new project

    At the risk of sounding stupid, what sort of thing would I use as deflector?
    1938 WLDR
    1940 WL (Race Bike)
    1944 WL
    1976 FLH

    http://1944WL.webs.com

  6. Re: Dave's new project

    an indian Dave

  7. #17

    Re: Dave's new project

    Quote Originally Posted by DaveAus View Post
    At the risk of sounding stupid, what sort of thing would I use as deflector?
    Just an example.
    https://www.ebay.com/itm/Rocket-Styl...MAAOSwVZNTmFa3

  8. #18

    Re: Dave's new project

    I have bought a handful of things from Lyle over the past 10 years Dave. http://www.landstromsfoundry.com/

  9. #19
    Join Date
    Mar 2008
    Location
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    12,283

    Re: Dave's new project

    Problems with velocity stacks occur when they are perpendicular to the airflow (British, Japanese, and European bikes with rear facing carbs don't suffer so much). That is why all the successful later WR, KR and Xrs all have oversized airboxes (not necessarily filters, just big dead air spaces) to allow uninterrupted high velocity flow. Note the huge airboxes on modern bikes, often the largest component on them. That is why S&S and others designed somewhat close fitting end covers ( with rolled edges and central cones) to disrupt the airflow and allow the carb to get a full gulp of air. The simplest type are little more than a half sphere attached to the leading edge to deflect the flow from the mouth of the velocity stack. Those custom "bird deflectors" are basically useless for tuning.
    Friends help friends move,
    Real friends help friends move bodies!

  10. #20

    Re: Dave's new project

    A tip from Mercedes Benz.They have the air roll around the warm motor before entering the motor.Warm air produces more HP.They did that to the dodge viper when they owned dodge,25% more HP without any changes to the motor internals.I also agree that with a velocity stack,air straight in is an issue that can't really be controlled.

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