Why is 48cc more powerful than 66cc

Discussion in 'Motorized Bicycle General Discussion' started by WdSjw, Sep 28, 2010.

  1. WdSjw

    WdSjw New Member

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  2. TehInteractive

    TehInteractive New Member

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    Where did you read that a 48cc is more powerful than a 66cc?

    There's no replacement for displacement.
     
  3. scotto-

    scotto- Custom 4-Stroke Bike Builder

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    I was unaware of this, could we see some stats, preferably tests done on a dynamometer that could prove this rumor? There is no replacement for displacement when it comes power in most circumstances.....honestly! This should apply the the engines in question.
     
  4. silverbear

    silverbear The Boy Who Never Grew Up

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    Are you talking about two different kinds of motors? I would guess that a 48cc Morini might out perform a 68cc china girl. Depends on what you're talking about. /clarify.
    SB
     
  5. Prasinos

    Prasinos New Member

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    Some 48cc Chinese engines are more powerful than some 66cc engines. But if they are tuned correctly and all other things are equal a higher displacement will result in more power.

    The whole no replacement for displacement argument is somewhat invalid, unless you think that your 80cc china girl can beat this 50cc:

    YouTube - Aprilia RS 50 Onboard
     
  6. bairdco

    bairdco a guy who makes cool bikes

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    oooh, i like riddles...
     
  7. scotto-

    scotto- Custom 4-Stroke Bike Builder

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    One word.....dynamometer!

    Show me!
     
  8. Nougat

    Nougat New Member

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    I'm led to believe that the 48cc will rev higher than the 66cc, resulting in a marginally higher top end. I'm also led to believe that the base carb that comes with both the 48 and 66 kits is more appropriately "tuned" for the smaller engine. (The throat is too small for the larger engine to breathe properly.)
     
  9. WdSjw

    WdSjw New Member

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    I can't find the vendor that made me question, and I don't remember who's site I was on that was saying that their 48cc had more torque and power than 66cc. I could be misremembering, though I doubt it. I just don't remember where I read it.auflg
     
  10. PR3C150N

    PR3C150N New Member

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    Yeah but that video, its like a racing bike, so higher compression and they would make it go faster then a normal 50cc, If your comparing engines at lease compare them to same engine, for example ,a racing motor 50cc and a 80cc motor bicycle.
     
  11. WdSjw

    WdSjw New Member

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    They must have meant 48cc has more power [if you peddle assist].
     
  12. PR3C150N

    PR3C150N New Member

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    haha all i can think is higher compression
     
  13. joabthebugman

    joabthebugman New Member

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    PR3C150N
    You also have to compare comparable gearing ratios

    With the proper gearing a 50cc could power a semi, or a race bike
     
  14. WdSjw

    WdSjw New Member

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    That was my thought also, make a lower rear wheel gear to get more speed out of a motorized bike, but now I am more comfortable with about 25 mph with the motor. As with all bicycles that I have ridden, I like to feel the bike, the mechanics, how it flows with the speed. But over 25 mph, on a motorized bike, I am kinda taking my chances. I can't feel the nuances anymore above that speed over the sound and vibrations of the engine. Don't get me wrong, I love my motorized bike, I just miss higher speeds with complete control.r.ly. or more control, as if complete control ever were an option drn2

    I have to say though, that the most control I have had over a bicycle was a schwin chicago fixie, that got stolen. doh! welded and braized. It's a haunted frame. I pity the fool that rides it. ha ha haaaaaaa.

    No, that's not fair. The person that rides it prolly bought it from a theif. So, I wish safe riding to the new owner. See, I am over it.
     
    #14 WdSjw, Sep 28, 2010
    Last edited: Sep 28, 2010
  15. PR3C150N

    PR3C150N New Member

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    Yeah i understand what you saying and your completely right in what your saying.
     
  16. WdSjw

    WdSjw New Member

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    Thanks for saying that. I was ready to let my bike be stolen. I have had a lot of bikes stolen, so I can tell when I am letting them go. When I am done riding them and begin to fear them, that's when I let them go.

    It will be fun to let this one with the engine get stolen. I will leave it unlocked until it gets ripped off, then I will say good bye to my motorized bike. And don't even say that isn't fair if the thief gets hurt or breaks their arm or leg.

    Noooo, don't steal a motorized bike, duh!

    I mean, no one steals a motorcycle out of a parking lot. What make them think they could steal a motorized bicycle from the bike rack?
     
    #16 WdSjw, Sep 28, 2010
    Last edited: Sep 28, 2010
  17. PR3C150N

    PR3C150N New Member

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    Ohkay haha =] So how do they manage to get stolen?
     
  18. WdSjw

    WdSjw New Member

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    There are bicycle thieves that steal if property looks as if uncared for. Sad to say but true. Tell me, what is a worse trap, a bike thief trap or a drug dealer trap?

    I think we should trap the bike thieves. How many bicycles have you have stolen? I have had 3 really expenseve $250 stolen from me. 2 plus $300. So, yea, I am a little upset about bike thieves seeing as how I spend my money on them and others always steal my best ones :-(
     
    #18 WdSjw, Sep 28, 2010
    Last edited: Sep 28, 2010
  19. RebelHellbilly

    RebelHellbilly New Member

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    i had a 49cc slant head that was just behind the 66cc regular head as far as power N all. had 48cc round head too. it held its on too..not as powerful as the 66 but still good. prolly with sum mods like i seen sum do on youtube the skies the limit with these motors:)
     
  20. PR3C150N

    PR3C150N New Member

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    oh =[ Well that really sucks, I live in australia , but i try not to leave my bike where it has potential to be stolen , i garage mine so no one can get it, but theres only like 7 people in my town that have MB. And you loosing all that money on what u love to do, that must really make you feel bad, and i bet u think about if you want to build another, because u don’t want to risk it getting stolen again!
     

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