90cc 2 strke cyclinder and piston kit?

Discussion in 'Motorized Bicycle General Discussion' started by Haughnph, Jul 16, 2012.

  1. locell

    locell New Member

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    If I recall correctly the "death race" (a big motorized bicycle race in Tuscon, AZ which occurs yearly) is limited to 66cc engines.

    Also, the one thing that is a great "equalizer" is the fact that you are motorizing a bicycle. It's somewhat of a self-limiting platform.
     
  2. Haughnph

    Haughnph New Member

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    I dont know about that. Does it have to be a bicycle or could I build a frame that uses pedals? Cause I have seen things. To top it off for the CA cats. I can put 100+cc engine on a bike with a little work.
     
  3. locell

    locell New Member

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    You can do whatever you want, its a hobby, not a regulated industry. This is just a forum for discussing motorized bicycles. I'm not sure what you are trying to do.

    Generally speaking, a motorized bicycle needs to be capable of moving when powered by a human only (think motor-assisted).

    If I recall correctly the "death race" (a big motorized bicycle race in Tuscon, AZ which occurs yearly) is limited to 66cc engines.
     
  4. mapbike

    mapbike Active Member

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    When I want to go 80 MPH I do it on this.

    IMHO doing over the top stuff on the Motorized Bike will only give law enforcement fire power to use against the hobby in areas of the country where they are barely tolerated as it is.

    :EXAMPLE:

    6 o'clock new flash......... Man killed on home built motorized bike while traveling at speeds believed to be at 70-80 MPH, to be clear about what a motorized bike is, it is a typical bicycle that has had a gas engine installed on it, the officials we spoke to told us they are dangerous and probably should not be allowed on the public streets.


    I wonder how many normal 25-30 MPH MB would be allowed to run around town as they had been after an ordeal like this happened, I'll bet it would be screwed up for everyone who had one and they wouldn't be tolerated in that town anymore.

    50-60 on a Bicycle is crazy fast, 80 on a bicycle is stupid fast....IMO

    just my $0.02 nothing more, nothing less, that all.

    Peace, Map
     

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  5. bigbutterbean

    bigbutterbean New Member

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    Here is my basic opinion. Yeah, you can make a bicycle go 100 mph by drafting a car or going down a steep enough hill. But just because you slap an engine on that bike and you happen to be giving it gas while drafting a car or going down a steep hil, does that mean you get credit for having the fastest motorized bicycle? NO. Anything you do to assist in achieving a certain speed that does not involve the bike or the motor itself simply does not count. There have already been plenty of people who have used these tricks to achieve these speeds. And as far as the engine goes, an ht engine is probably never going to go 80mph under any kind of load and survive it. The gearing required to make an ht engine go 80 mph under gas power alone would require extreme rpms that the engine is simply not capable of.
     
  6. mapbike

    mapbike Active Member

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    Yep......right on...!(^)

     
  7. headtrama

    headtrama New Member

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    The crank will let go way before you come any ware close to 80 mph . You will need way more horse power to go 80 then that crank will ever handle . After about 5 hp its not if its when its going to break .
     
  8. locell

    locell New Member

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    Well, they way I'm understanding this there are two sides to this and they are both valid.

    A. It is physically possible for a bicycle to achieve speeds in excess of 80 mph.

    B. Nobody has went 80 mph on a motorized bicycle, under the power of strictly the motor. Current engine designs just don't have the capability.

    Is is likely, no.
    Is it possible, yes.

    If there was a joint project between the CIA and NASA with a secret budget to build an 80 mph motorized bicycle......

    OP came here asking some questions and he got a variety of answers, and that's good. That's what this is for. I'm not going to be the one that discourages.

    Never let reality get in the way of your dreams :)
     
  9. Longshot270

    Longshot270 New Member

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    Big bore anyone? Probably would need a custom jug because the china girls are kinda thin and a piston to fit.
    Shift kit will be required with some long legged gearing.
    Slap some fiberglass body work on there and, while it will be difficult, 80 does seem possible if you are shooting for a one time record.
     
  10. bigbutterbean

    bigbutterbean New Member

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    Boring out the cylinder on its own isn't going to give you enough power to hit 80, and even if it did, the rest of the engine components are not built to handle that speed. Like the other guy said, your crank is going to give out before you get close to 80. The rpms required to allow an ht engine to hit 80mph would very likely cause the engine to experience multiple mchanical failures in a very short period of time. I am sure that there are engines that can allow a bicycle to achieve speeds of 80(+)mph without causing damage to the engine or bicycle frame, if the proper frame is used.but an ht engine is not it.
     
  11. bigbutterbean

    bigbutterbean New Member

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    Wondering if anyone knows where I could find a seat like that, or if it is a custom?
     
  12. Harold_B

    Harold_B Member

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    Funny how 90cc went to 80cc to 80mph. At least I didn't follow but that's just me. As far as going 80mph, there's this for reference: http://www.elsberg-tuning.dk/recordbikes.html

    Hope the link works. I think it's pretty interesting what can be when people put their minds to it.
     
  13. Longshot270

    Longshot270 New Member

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    Why would it need to rev high? Use gearing that keeps the engine in the ideal peak of the powerband. Boring the engine won't double the horsepower but if you have the tools it is easy to do and will help. If it has to be a single speed, the rear would have to be around 15 tooth.

    If a bicycle can reach 80, I'm sure these engines could also
    http://www.wired.com/culture/lifestyle/news/2007/03/bikerecord_0330

    80 could never be reached by just slapping an engine onto a rusty old barn find but with a custom built bike, a properly built engine with a few mods and body work, I can see getting pretty fast.
     
  14. locell

    locell New Member

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  15. Ibedayank

    Ibedayank New Member

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    time to educate you on a few things....

    human flat land pedal only speed records are....
    Current WHPSC Records:
    In 2009, Sam Whittingham broke his own record again for a human powered speed of 82.819 MPH!
    In 2010, Barbara Buatois broke her own record, with a women's human powered speed of 75.69 MPH.
    In 2011, Greg Westlake broke his own record with an arm powered world speed record of 45.68 MPH.
    this is done using less then 1/2 a horse power on a BICYCLE
     
  16. Ibedayank

    Ibedayank New Member

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    would help if the people reporting a story got their facts right

    http://www.recumbents.com/wisil/whpsc2012/speedchallenge.htm
    During the week of September 10th through September 15th 2012, cyclists from around the world will gather on SR305 outside of Battle Mountain, Nevada for the 13th consecutive year of racing on what is arguably the straightest, flattest, and smoothest road surface in the world.

    The 4,619ft (1,408m) altitude road allows riders an acceleration zone of over 4 miles, enabling them to reach their maximum velocity before being timed over a 200 meter distance. The section of the road used for this event was newly refinished in 2009, with a smooth surface specially prepared for human powered cycle racing by the Nevada Department of Transportation.
     
  17. happyvalley

    happyvalley New Member

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  18. bigbutterbean

    bigbutterbean New Member

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    That's all cool and everything, but we are not talking about pedal-only speeds. We are talking about motorized speeds. Yes, there are bicyclists who can go extremely fast. They are obviously very well trained and conditioned riders, and at least some of them are probably professional. There is a big difference between a trained rider and the average joe.
     
  19. Ibedayank

    Ibedayank New Member

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    wrong again its in the GEARING you can either gear for power or speed.... those bikes are geared for speed and could not climb a hill at all without being pushed up it. If you read the posts and the links you would know it took almost FIVE miles to reach that speed
     
  20. Haughnph

    Haughnph New Member

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    Chill I dont plan running this in the city. I have a nice stretch of ol highwayjust east of El Paso. My Pa is law enforcement out there. If I accomplish this. I assure you it will be under the safest of conditions.
     

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