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Discussion 3D Printed Velocity Stacks

Discussion in 'Kawasaki 250cc In-line 4's' started by ShingoDingo, Apr 21, 2020.

  1. ShingoDingo

    ShingoDingo Member

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    Hey all!

    I've gotten my hands on a decent 3D printer finally and I'll be getting my hands on a Balius in the next few weeks. Has anyone got Velocity stack dimensions that I can start designing up, so that I can have some printed and ready so I can get stuck into the bike? I was planning on printing a bunch of varying sized stacks, find which one feels best, then reprint and cast in aluminium (Yeap! That's a thing I can do haha)

    I was planning on a cafe fighter style of build, velocity stacks for now (I have a supercharger in storage for later...)

    Would also LOVE to hear how other users have potentially worked 3D printing and rapid prototyping into their builds, as I'm trying to get together a shop that has a strong focus on using iterative design and rapid prototyping to create unique bikes
     
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  2. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    CV carbs require an airbox and filter to function correctly.
     
  3. Frankster

    Frankster Grey Pride...Adventure before Dementia Staff Member Premium Member Ride and Events Crew

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    @maelstrom is correct, but you go right ahead and make some velocity stacks for your Balius. Be careful when designing them as the carbs have requirements that are normally built into the airbox e.g. holes that can't be covered up etc. Following on from what maelstrom said, I guess you want the Velocity Stacks out in the open, but if you put them inside an airbox you should get the best of both world's or a disaster depending on tuning. Keen to see you stick a Supercharger on your Balius. Maybe skip the stacks and go straight to that.
     
  4. ShingoDingo

    ShingoDingo Member

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    News to me haha, shows how well I know these vehicles as it sits. I just know I've never heard an engine I wanted to work on more than this one.

    Do these motors respond well to pods? I tried to find some and couldn't find any drop in kits, which doesn't bode well.

    Sent from my SM-G988B using Tapatalk
     
  5. ShingoDingo

    ShingoDingo Member

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    @Frankster I'd be taking the rough dimensions of the ZXR 250s internal airbox velocity stacks, paying super close attention to the mounting points. Beauty of 3D printing is that if it doesn't line up ive lost like 3 dollars in time, material and effort combined.

    Id love to step straight to supercharging but I dont have my shop up right now, I figure I can work and tweak the bike a bit whilst I'm working from home, and once my shop is set up I'll get stuck into the fun stuff

    Sent from my SM-G988B using Tapatalk
     
  6. Gen

    Gen Well-Known Member

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    Super what ?:thumb_ups:
     
  7. Frankster

    Frankster Grey Pride...Adventure before Dementia Staff Member Premium Member Ride and Events Crew

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    I'd be taking the rough dimensions of the ZXR250s internal airbox velocity stacks,

    Smart move. Those little stacks must be in there for a reason.

    I have a spare airbox (bottom) which you can use. PM me if you want it (free).
     
  8. Frankster

    Frankster Grey Pride...Adventure before Dementia Staff Member Premium Member Ride and Events Crew

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    Show off!
     
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  9. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    FactoryPro have done a bit of R&D with velocity stack's, making different length stack's and fitting them to bike's, then lot's of dyno tuning etc etc
    One of their kit's give's a Suzuki GSXR 1397cc 3 to 4 hp at wot.

    Doesn't sound like there's a lot to be gained over an oem setup if you're still using stock carby's
     
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  10. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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  11. Frankster

    Frankster Grey Pride...Adventure before Dementia Staff Member Premium Member Ride and Events Crew

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    You're probably right, but if shingo wants to have a play with 3D printing bits, then the more people we have on the forum with those skills the better for the rest of us. 3D printing has come a long way in the last 5 years. Can't wait to see the next generation of printers...

     
  12. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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  13. jmw76

    jmw76 Well-Known Member

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    Yeah. I 3D printed some velocity stacks for the RS40 carbs on the GSXR1216 lump in my little race car. Printed in ABS and they seem to have held up well. I expected that the ABS might not be a good choice with the race fuel that I use. CAD rendering of design shown
    velocity-stack-development.JPG
     
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  14. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    I am using nylon for mine.
     
  15. jmw76

    jmw76 Well-Known Member

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    Yes. I can print nylon, but found I didn't need the complication.
     
  16. jmw76

    jmw76 Well-Known Member

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    The velocity stacks on my race car. The strange colour is from attempting to use a bit of acetone to smooth the surface. Not as effective as I had hoped but still quite usable. RIMG0076.jpg RIMG0078.jpg
     
  17. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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  18. jmw76

    jmw76 Well-Known Member

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    Wiped over with acetone on that occasion. Unfortunately the acetone was contaminated with white abs, which didn't help.
    I have used acetone vapour before also. The vapour process works quite well but takes a while. Too long though and the part can deform.
     
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