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Drag Racing Drag Race your bike?

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

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  1. Frankster

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

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    Wow. I am more in awe now. A 4-stroke 250cc running low 10's.
     
    Frankster, Mar 13, 2017
    #61
  2. Frankster

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

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    Okay, so according to this thread...

    http://www.accessnorton.com/surprising-engine-modification-t11787.html

    ...Mick did some very serious mods to the engine and it was running on a 85% nitro/methane mixture. The bike was basically a top fueler albeit in a very small capacity. I don't fully understand all the mods that are covered in the thread, but the 360 degree mod they talk about seems to be turning the twin into a "big bang" engine. I expect some of the more learned people on this forum will make more sense of the running the engine backwards and ignition setting mods.
     
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    Frankster, Mar 13, 2017
    #62
  3. Murdo

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

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    By going to 360 degree, the engine will be breathing IN on one cylinder or the other which gives smoother intaking from the blower. With the 180 engine there is two intake pulses together, then two dead strokes when no intaking will happen but the blower is still pushing in mixture.
     
    Murdo, Mar 13, 2017
    #63
  4. Hugh Scarlett

    Hugh Scarlett Member

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    Changing the engine to a 360 made sense as it is more efficient, you get one ignition cycle on each crank rotation, the 180 crank on a twin produces an irregular ignition cycle; 1 on a half cycle and one on 1.5 cycles. 180 cranks are best in two strokes as you get an ignition every half rotation.

    Reversing the motor's rotation eliminated the need for an intermediate gear between the crank and clutch to get the gearbox rotating the right way.
     
    Hugh Scarlett, Mar 13, 2017
    #64
  5. Hugh Scarlett

    Hugh Scarlett Member

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    Thanks Murdo, that's the last piece of the jigsaw. I've never worked with 'blowers' but what you said makes perfect sense, all my work was with road racing.
     
    Hugh Scarlett, Mar 13, 2017
    #65
  6. Frankster

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

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    I've heard of people re-phasing (not sure if that's the right term) engines so that a 4-cyl ends up having 2 cylinders firing at the same time. I thought this was called a "big bang". Someone said a Kiwi did it to a Hayabusa for drag racing and it was quite successful. So, the outright world record for a 250cc drag bike is 9.8 seconds. Do we all agree?
     
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    Frankster, Mar 14, 2017
    #66
  7. Murdo

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

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    Would mean making a new crank and camshafts, re configuring the ignition and a whole lot of work for not a lot of gain.
     
    Murdo, Mar 14, 2017
    #67
  8. Frankster

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

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    I believe the NZ guy cut the cams and the crank and then welded them to facilitate the "big bang" cycle. Is that possible?
     
    Frankster, Mar 14, 2017
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  9. Murdo

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

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    Possible, but so much work that it would be less to make a new one.
     
    Murdo, Mar 14, 2017
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  10. Frankster

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

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    I'm guessing there's a lot of work whatever you do. Given it took Mick Hand 20 years to get the his ultimate goal i'll be 75 by the time I get to his level! I'll be more than happy to run an 11 something on any 250cc bike. That's my goal now.
     
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    Frankster, Mar 14, 2017
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  11. Murdo

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

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    My Bike:
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    So, I've been thinking on how to make a simple timer set up for some drag practice on some quiet country roads to check on my progress of modifications. Just something with a start beam and a stop beam 200me away and a way of displaying the numbers until I can turn around and get back to the start to check them. Been looking at bicycle, horse and runners timers but none are quite suitable (a lot do lap times) and most around several thousand dollars. I don't want to spend too much, but want it to be reliable. Anybody have any ideas?
     
    Murdo, Jul 11, 2017
    #71
  12. Wozza

    Wozza Active Member

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    Wozza, Jul 11, 2017
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  13. kiffsta

    kiffsta Senior Member

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    Entice @GreyImport with a 6 pack and get him to time you
     
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    kiffsta, Jul 11, 2017
    #73
  14. Murdo

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

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    :lolsign:
     
    Murdo, Jul 11, 2017
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  15. Frankster

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

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    I don't think there are any systems out there for under $1,000. Even building something from home will involve a lot of cable, a number of optic sensors and a method of logging data. It will be great to see how you go with this challenge.
     
    Frankster, Jul 12, 2017
    #75
  16. Andych

    Andych Moderator Staff Member Premium Member Contributing Member Dirty Wheel Club

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    Andych, Jul 12, 2017
    #76
  17. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Not sure that will work on Murdos mobile

    old-phone.jpg
     
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    GreyImport, Jul 12, 2017
    #77
  18. Wozza

    Wozza Active Member

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    lol he has the upgrade ver of mine :D
    tin-can-telephone.jpg
     
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    Wozza, Jul 12, 2017
    #78
  19. kiffsta

    kiffsta Senior Member

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    IMG_1127.JPG
     
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    kiffsta, Jul 12, 2017
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  20. Murdo

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

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    Gosh, you guys are funny. :D
    There are so many ways to achive this, but they all cost big $$$.
    I had a thought about using the cotton and a paperclip idea, but would still need to get timers.
     
    Murdo, Jul 13, 2017
    #80
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