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Thread: Electric miniature race bike

  1. #1
    Junior Member
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    Feb 2018
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    Electric miniature race bike

    Help needed to scope out some ball park specs for a race bike project.

    I am a complete novice on electric vehicles but have a basic understanding of electrical stuff. So please be tolerant and excuse me in advance if I say dumb things or ask silly questions.

    I want to scope out some ball park specifications for a mini race bike. I have quite specific performance goals for this bike.

    I have done a bit of race bike fabrication before and modifying my steel donor frame and motor and engine mounting is something I feel I can manage.

    The first step is to scope out what it would take to create an electric bike with competitive performance to a 20 hp miniature motor bike with 11 ft/lbs of torque that weighs 85 kgs. The bike needs to be able to complete 16 x 35 second laps around a 500 metre long kart track. The bike will not need an onboard charger as it can be charged in pits from a 230V power supply and external charger.

    I guess I need to know as a starting point to see if the project is feasible is the following?

    1. A rough estimate of how many hp and ft/lbs of torque I might need given that I will be trading off hp in favour of ft/lbs with and electric engine.

    2. How much battery capacity I will need to complete 16 laps of above track (16 laps includes warm up and return to pits laps). I have two options to consider here for doing multiple sessions in one day....having extra battery capacity and topping up between sessions or using hot swap batteries). Bike will need to be capable of doing about 4-5 sessions in one day with about 1 hour between sessions.

    Once I have scoped out the basics I can think about what motor to use, what controller to use, and what battery pack to use or assemble.
    Last edited by Wobblyas; 16 February 2018 at 2223.

  2. #2
    Senior Member Stevo's Avatar
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    Are you thinking size like Yamaha YSR 50? I use to race a YSR 75! What a blast that was! Of course I couldn't compete with the guys running bored out kx 80 big wheels with racing slicks!!! Ahhh those were fun days!

    Anyway, the most affordable way for you to go if I was building a YSR type roadracing pitbike, I'd find a cheap older two stroke 125 dirtbike, like mid 1990's, get 4 Nissan Leaf modules and open 'em up, rewire all the pouches in series, get a Altrax AXE4834 and a Motenergy ME909 And you'd be there bro. I just happen to have an AXE4834 ready to ship with a set-up contacter,(fuse,diode and resistor). All you need is the batts, (which I can also sell 4 to you), the motor, and a chassis. Hmmm... I'll keep my eyes open for a chassis near me. I think this might be a fun toy. I might just have to build one for myself
    Unfortunately, there is no cart track near me that I could go sneak onto like I used to back in the day
    Last edited by Stevo; 19 February 2018 at 1158.
    Current rides: '96 Honda Ohlins VFR, '03 Cannondale C440R, '03 Cannondale Cannibal, '06 Yamaha 450 Wolverine 4x4
    Current builds: WORX.VOR.v3.2

  3. #3
    Senior Member Nicman's Avatar
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    May 2015
    Jackonsville, FL
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    Zero makes an electric racing style dirt bike. I would say if you could get better hp/torque while sacrificing range you’d be best off. 16x500m=~5.0 miles. I get about 25 miles from 11 Nissan Leaf batteries. (About 90v)
    If you are charging on 230v in between, you’d be fine with about 5KwH of power before having too much voltage sag to affect motor performance.

    Compared to gas, the torque is amazing, so if you find a motor with equal HP, you’ll have a huge advantage over ICE if you keep a similar weight.

    Sent from my iPhone using Tapatalk


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