Switchblade (pipe)Dream Build

Discussion in 'Pre-Motorized Bicycle Information.' started by PsychDoc, Sep 18, 2019.

  1. PsychDoc

    PsychDoc Member

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    I am grateful for the energy and input- don't think its not considered- I was already well on my way toward the GC160- and I'm looking for a cruiser, not a racer. Your first build was adventurous for sure- I don't think I have the guts to do all of that.
    Still considering transmission options- liking the look of the 3D manual clutch.
     
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  2. PsychDoc

    PsychDoc Member

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    My friends- this will be a match made in heaven.
     

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  3. Tony01

    Tony01 Well-Known Member

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    Well, you’ve run yourself into a corner with an engine that is known to blow when valve float rpm is reached, so a cvt geared somewhat tall may work.There are non trivial issues you’ll have to work out, like having a strong rear wheel and hub to handle the extra starting torque, aligning the cvt output sprocket to the wheel sprocket... also you will need an extra wide bottom bracket to clear the cvt... just a whole slew of things to work out. That cvt unit is BIG.
     
    #23 Tony01, Nov 8, 2019 at 1:49 AM
    Last edited: Nov 9, 2019 at 1:42 PM
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  4. PsychDoc

    PsychDoc Member

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    Thanks Tony- I am thinking a cruising rpm around 3500-4000 with a rare burst to 5000. I think a jackshaft is going to need to be part of the driveline. I was hoping I could do without but with gearing and alignment issues to solve a jackshaft mid stream should solve a lot of problems.
    And- what do y’all think about the 3D manual clutch? I’m giving it serious consideration.

    Tony- do you know who put Alice in the chains? Is she some sort of hostage needing rescue? Or maybe she’s just into some consensual BDSM?
     
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  5. Tony01

    Tony01 Well-Known Member

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    I think Alice just wants someone to whisper in her ear...
     
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  6. PsychDoc

    PsychDoc Member

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    Well, I have decided on the engine- so that’s sorted. Now to the how to mount this thing. I might have to either learn to weld or farm out the job. I don’t know if a bolt on option exists.
    I’ve been all over the map thinking trans, vs CTV, vs manual clutch- still not settled. The left face of the engine is about 3” left of centerthe -the rear sprocket should be about 1.25” from centerline. So, regardless of clutch choice, I will need to get the chain approximately 2” to the right... I don’t want to shift the engine right - it is already right side heavy. So jack shaft? Will it fit? Ideas?
     

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  7. indian22

    indian22 Well-Known Member

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    Doc when I build using a built frame I assemble it first. Rolling frame, up on rubber and ridable as a peddle bike. That's how I know if it's going to work with the individual components & how they will fit on the bike. You know the engine fits in the frame but you need the bike up on wheels or find a bike frame just like yours that's been motorized more or less like you want it. The CVT should fit with few problems, but it's like assembling a jigsaw puzzle you find one correct piece at a time and build from there. The frame of the bike represents the borders of the puzzle next the fork then the wheels and tires That should be done before selecting a motor etc. etc. one piece depends & builds on the previous piece. Final alignment takes place at the end of the build, so leeway is required for final adjustments. One off builds are all different and hardly anything ever just fits. What you want has to be altered quite often into what will work and or fit with modifications, That's why time to construct these type builds isn't calculated in hours or days. It takes time especially the first few one off bikes.

    Rick C.
     
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  8. PsychDoc

    PsychDoc Member

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    Thanks Rick, this was a fully functional Nirve Switchblade, you may recall. My thought is to sort the powered side then route the pedal side. I haven’t seen anything very close to this build though I admit my experience is little.
    My current theory on the cvt is to use a shaft through the ‘inside’ of the mounting plate to get the output sprocket further toward the centerline.
     
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  9. indian22

    indian22 Well-Known Member

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    I'd make every effort to get the stock motor and unaltered CVT to actually work before any alterations are made to either & before mounting in the frame. I bolt the motors to a workbench so I can start and test off the bike, with CVT mounted, new motors I run a couple of hours like this before I try to mount in a frame. Sticking to basics will save a lot of time and effort not to speak of dollars.

    Rick C.
     
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  10. PsychDoc

    PsychDoc Member

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    This is a bit of a double post but I want to keep current
    Quick update- I received my front hub today. I think it was a good choice. Still waiting for my spokes- I think they are being conveyed via Junk transporting rubber dog poo to the local joke shop. Anyway, this thing is smooth as silk. It was ordered from Brands Cycle & Fitnesses via Amazon- 66.49 + tax free delivery.
     

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  11. indian22

    indian22 Well-Known Member

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    Sturmy's been around for 120 years or better & make some nice products. Lace 'em right and they'll work well.

    Rick C.
     
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