Engine Vibration

Discussion in 'Motorized Bicycle General Discussion' started by old motorbike, Oct 19, 2008.

  1. velardejose

    velardejose New Member

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    Yes
    We use lots of sound deadening material for car audio purposes
    Balistic, Dynamat, usw
    Basic idea is to make the car panels heavier = less vibration
    Peace
     
  2. velardejose

    velardejose New Member

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    Thinking about putting lead in the engine mounts to reduce engine vibration
    I was looking at my engine mounting studs, and reading all the posts about damaged mounting studs here I got an idea
    I will fix weight to the frame with clamps as close as possible to the engine mounts
    I bought 2 lbs lead yesterday, hope to post my findings+pics later
    Peace
     
  3. NEAT TIMES

    NEAT TIMES New Member

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    This Is A Needed Thread, I Have Been Holding Off My Pointe Beach 7sp Sbp Shifter Build. Was Going To Pm Dax 5 Min Before I Saw This Thread. Again, This Is A Great Thread,
     
    #23 NEAT TIMES, Oct 24, 2008
    Last edited: Nov 5, 2008
  4. mechanickid

    mechanickid New Member

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    where do you guys get this lead sheet?
     
  5. mechanickid

    mechanickid New Member

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    after a long ride today i thought my nuts were going to fall off
     
  6. Bikeguy Joe

    Bikeguy Joe Godfather of Motorized Bicycles

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    Lead sheet goes between the frame and the engine, and between the "U" shaped clamp piece, and the frame.

    I know there are folks who will point out that lead is not the most use friendly material in that it is "poisonous". Having said that, use glove when handling it, and especially if it has white dust/corrosion on it.

    Got mine from the old style boot that goes around sewer/chimmney vents.

    Cut four pieces and install them on each side of both tubes at the mounts.

    Fit up the engine, slip each piece in place and tighten as usual.
     
  7. NEAT TIMES

    NEAT TIMES New Member

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    Kid, With The Large Nuts, Use Torque Wrench And More Jb Weld. Hope This Helps!!!
     
    #27 NEAT TIMES, Nov 5, 2008
    Last edited: Mar 31, 2009
  8. thatsdax

    thatsdax Member

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    One of the best ways to reduce vibration is to go to a 40T rear sprocket. This puts the motor on the sweet spot. Makes the ride super nice. Enjoy the ride...
     
  9. mechanickid

    mechanickid New Member

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    does 4 teeth really make a difference?
    thanks Times, i'll try that LOL
     
  10. Bikeguy Joe

    Bikeguy Joe Godfather of Motorized Bicycles

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    Yes, yes it does. Imagine the 40T with lead mounts.....
     
  11. Dan

    Dan Staff
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    Hmmmmm.....

    Thanks folks.
     
  12. Creative Engineering

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    Guys,

    The lead will deform rapidly and thin out...the engine mount will then loosen. Tighten, loosen again...etc. until the lead is paper thin!

    Use a high durometer rubber 120+

    Isolating the engine frame-side "only" will be marginally effective. Look at how motorcycle/car engines are mounted to the frame.

    Jim
     
  13. Dan

    Dan Staff
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    Thanks Jim. Makes sense. Discourse is a good thing.
    Still going to try Joe's lead thought. Just from personal experience, solid is better then allowing vibration to magnify. Is all an experiment anyway.
     
    #33 Dan, Nov 5, 2008
    Last edited: Nov 5, 2008
  14. Creative Engineering

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    Hmmm, “Before enlightenment; chop wood, carry water. After enlightenment; chop wood, carry water.” Zen Proverb

    How about "Zen and the art of motorcycle maintenance".

    Jim
     
  15. Dan

    Dan Staff
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    Great book. Is mentioned often here. "What is quality?"
     
  16. Bikeguy Joe

    Bikeguy Joe Godfather of Motorized Bicycles

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    Just a note....I haven't had any loosening or other problems.....so far. At least 500 miles. The lead may thin, but when? 1000? 2000? 501?

    I will watch it closely in the next couple of builds.
     
  17. Bikeguy Joe

    Bikeguy Joe Godfather of Motorized Bicycles

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    Yes, marginal, that's why I say to use a piece in between the engine and frame, and also between the frame and mount cap.
     
  18. skinnydog1_2007

    skinnydog1_2007 New Member

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    dance1
    Hi all this is my first post wanted to show you all my engine mount set up. I hated the vibration that was coming from the motor through the frame. So I made up my own engine mounts using a hard rubber compound. The rubber was the type you would find on heavy duty floor mats in a work shop to stop people from slipping over.They work really well and it has done a great job with stopping the vibration through the frame now I see just the motor vibrating and not me.
     

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  19. Dan

    Dan Staff
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    Howdy Skinny, welcome. Looks good.
     
  20. ibcnya

    ibcnya New Member

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    This is true about the smaller rear sprocket, with a 36T the 80cc I got from you vibrated a little during the break in period but vibration has ceased and isnt a problem at all now. Great engine, im loving it....
     

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