Drag Racing Drag Race your bike?

Discussion in 'Motorcycle Racing and Track Days' started by Murdo, Feb 20, 2014.

Page 5 of 8
  1. ShaneP

    ShaneP Well-Known Member

    Messages:
    2,574
    Likes Received:
    1,101
    Trophy Points:
    798
    Location:
    Yeppoon
    I was thinking about a timer system for my project speed fzr (the only thing I've done to this bike so far is try to fit a knobby for a dirt drag I never did and order a tappet gasket). I was going to use mirrors and maybe a laser (restricted item nowadays, I believe) but a high-speed camera rifle scope and mirrors might be the cheapest option. You could try jaycar or ebay for sensors and laboratory suppliers for lasers?

    On the topic of drag times, I might try to get the fzr to the calliope drags on Aug 5, but that day is quite booked already. Maybe I could offer it to someone else to ride...
    And for a quick 250 4-stroke bike, I'd get a single cylinder motor, in a minimalist frame and a jockey. Other tricks to beware of include not using all your revs (maximum torque is about 10,000rpm and max power about 14-15,000, after max power you might be getting less acceleration then if you change gears, there's maths on that), or changing spark timing as revs increase, more preload on suspension and hardening the dampening settings to reduce wheelies, cam timing and/or profile can be varied for higher revs, provided the valves close quick enough. Well there's a lot of things one COULD do, but cost and time and such are common limitations.
     
    ShaneP, Jul 19, 2017
    #81
  2. Andych

    Andych Moderator Staff Member Premium Member Contributing Member Dirty Wheel Club

    Messages:
    4,300
    Likes Received:
    2,514
    Trophy Points:
    918
    Location:
    Albury 2641
    While there was a good laugh about non existent communication devices earlier... there are some relatively cheap options for smart phones with all the options which together with this App be the perfect self timing setup...
    Most likely less than $400 and you get a very good phone to boot... I dont think you would find too much cheaper than that to do the same job... apart from the 6 pack of beer....
    Look for the ASUS Zenphone 3 5.2" phone... around $340 at Kogan... my Son uses this and it is right up there with my iPhone 7 Plus for photos, speed etc...
     
    • Like Like x 1
    Andych, Jul 19, 2017
    #82
  3. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

    Messages:
    6,406
    Likes Received:
    4,795
    Trophy Points:
    1,148
    Location:
    Tamworth, NSW
    I've not put a lot of thought into this yet, but the best I've come up with is using a doorway chimer (like the beam when you walk into a shop) at each end with wires to a cheap digital stopwatch using the doorway beams to send a signal to the stopwatch buttons.
    Any suggestions?
     
    Murdo, Aug 9, 2017
    #83
  4. Grasshopper

    Grasshopper Well-Known Member Dirty Wheel Club

    Messages:
    1,060
    Likes Received:
    514
    Trophy Points:
    543
    Location:
    Tamworth NSW
    Here's a Jaycar one... There are 3 wires to the laser unit, which sends the beam to the reflector and reads it back... I would say the 3 connections would be: 1) supply voltage, 2) negative and 3) sensor wire... this could be used to trigger something.... an electronic stop watch?

    https://www.jaycar.com.au/commercial-grade-doorway-beam/p/LA5193
     
    Grasshopper, Aug 9, 2017
    #84
  5. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

    Messages:
    6,406
    Likes Received:
    4,795
    Trophy Points:
    1,148
    Location:
    Tamworth, NSW
    Working off 9 volts, that could be the go.
     
    • Like Like x 1
    Murdo, Aug 9, 2017
    #85
  6. Grasshopper

    Grasshopper Well-Known Member Dirty Wheel Club

    Messages:
    1,060
    Likes Received:
    514
    Trophy Points:
    543
    Location:
    Tamworth NSW
    I'll get my hands on one so we can test
     
    • Like Like x 1
    Grasshopper, Aug 10, 2017
    #86
  7. Jo Verhelst

    Jo Verhelst Forty2 Contributing Member

    Messages:
    583
    Likes Received:
    641
    Trophy Points:
    423
    Location:
    belgium
    dragracing.jpg
     
    Jo Verhelst, Aug 24, 2017
    #87
  8. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

    Messages:
    6,406
    Likes Received:
    4,795
    Trophy Points:
    1,148
    Location:
    Tamworth, NSW
    I disagree. :p
     
    • Like Like x 1
    Murdo, Aug 24, 2017
    #88
  9. Jo Verhelst

    Jo Verhelst Forty2 Contributing Member

    Messages:
    583
    Likes Received:
    641
    Trophy Points:
    423
    Location:
    belgium
    drag.jpg
     
    • Like Like x 1
    Jo Verhelst, Sep 9, 2017
    #89
  10. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

    Messages:
    6,406
    Likes Received:
    4,795
    Trophy Points:
    1,148
    Location:
    Tamworth, NSW
    Looks similar to the one I had.
     
    • Like Like x 1
    Murdo, Sep 10, 2017
    #90
  11. Tigger996

    Tigger996 Well-Known Member

    Messages:
    108
    Likes Received:
    71
    Trophy Points:
    213
    Location:
    Totton, UK
    • Like Like x 2
    Tigger996, Sep 27, 2017
    #91
  12. Frankster

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

    Messages:
    4,036
    Likes Received:
    2,261
    Trophy Points:
    923
    Location:
    Tasmania
    I'm a big Nostalgia Drag Racing fan and want to build a bike to race in these events one day. The cut off used to be 1985, but lately I've noticed events are being advertised as pre-1980 for bikes, which limits the 2fiftycc options. Swan Hill recently had a Nostalgia Meet, but I did notice some modern bikes racing, so I might have to ask them what there "rules" relate to. Here's a link for any Nostalgia fans...

    http://www.dragnews.com.au/news-all/local-news/4489-gallery-swan-hill-nostalgia-drags.html
     
    Frankster, Jun 2, 2018
    #92
  13. Frankster

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

    Messages:
    4,036
    Likes Received:
    2,261
    Trophy Points:
    923
    Location:
    Tasmania
    WSID has a street bike class (@Linkin) that runs as part of its "Atura NSW Championship".Their last meeting before the Winter break was held recently and you can look at a gallery and results/details in this link...

    http://www.dragnews.com.au/news-all...mpionship-season-heads-into-winter-break.html

    A couple of pics for you... the first is how NOT to launch and the second is of someone out to have a crack and see how they go (16 second dial-in means all of us 2fiftycc drag racers would be giving this person at least a 1 second head start. @Linkin probably 2 seconds).

    Noooo.jpg
    16sec dialin.jpg
     
    • Like Like x 1
    Frankster, Jun 2, 2018
    #93
  14. Tigger996

    Tigger996 Well-Known Member

    Messages:
    108
    Likes Received:
    71
    Trophy Points:
    213
    Location:
    Totton, UK
    250's pre 1980 include 250 Villiers Starmaker, 250 Honda plus Shorrock and Nitro, Suzuki and Yamaha twins.

    Des Heckle Topcliffe 250 starmaker 1966 Des He.jpg
     
    • Like Like x 1
    Tigger996, Jun 2, 2018
    #94
  15. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

    Messages:
    6,406
    Likes Received:
    4,795
    Trophy Points:
    1,148
    Location:
    Tamworth, NSW
    Ahhh, the 'old starmaker hand grenade'.
     
    Murdo, Jun 3, 2018
    #95
  16. Frankster

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

    Messages:
    4,036
    Likes Received:
    2,261
    Trophy Points:
    923
    Location:
    Tasmania
    I'm pretty sure if I sat on that thing it would probably break or bend in the middle at the very least!
     
    Frankster, Jun 3, 2018
    #96
  17. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

    Messages:
    6,406
    Likes Received:
    4,795
    Trophy Points:
    1,148
    Location:
    Tamworth, NSW
    Now you know where I got the idea for my red drag bike.
     
    • Like Like x 2
    Murdo, Jun 3, 2018
    #97
  18. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

    Messages:
    6,406
    Likes Received:
    4,795
    Trophy Points:
    1,148
    Location:
    Tamworth, NSW
    • Like Like x 1
    Murdo, Jun 3, 2018
    #98
  19. Frankster

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

    Messages:
    4,036
    Likes Received:
    2,261
    Trophy Points:
    923
    Location:
    Tasmania
    Wow, 11.74 ET from a 2fiftycc back in 1970...very special bike. Must weigh close to nothing?
     
    Frankster, Jun 3, 2018
    #99
  20. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

    Messages:
    6,406
    Likes Received:
    4,795
    Trophy Points:
    1,148
    Location:
    Tamworth, NSW
    • Like Like x 1
    Murdo, Jun 3, 2018
    #100
Page 5 of 8

Share This Page