Why do you need a vibration dampener?
+ Reply to Thread
Page 1 of 3 1 2 3 LastLast
Results 1 to 14 of 34

Thread:
Why do you need a vibration dampener?

  1. #1
    steelcomp was here
    Join Date
    Dec 2007
    Location
    n/e TN
    Posts
    26,280

    Default Why do you need a vibration dampener?

    This is as simple an explination as it gets. Copy and pasted from TCI's site 'cause I just don't feel like typing it out tonight.
    Hope this helps in some understanding.

    Why do you need a vibration dampener or "harmonic balancer"?

    Engine speed slightly increases during power strokes and decreases during compression strokes. This is what causes twisting vibration of the crankshaft. In some instances, since the crankshaft drives the cam, crank vibrations can also cause instability in the valve train. The dampers and absorbers are designed to reduce these vibrations.

    What is crankshaft torsional vibration?

    Answer: Due to their mechanical design, all internal combustion engines will display crankshaft torsional vibration. This is due to the fact that torque cannot be applied to crankshafts from firing cylinders with steady pressure. It varies with the position of the crankshaft in relationship to each cylinder. As the piston rises and falls, so does cylinder pressure. The changing pressure, acting on the piston, results in forces transmitted along the connecting rod and applied to the crankshaft journal. In the operation of the crankshaft assembly, the forces reverse back and forth. The crankshaft reacts and transmits these forces that are indicative of crankshaft torsional vibration.

    This has nothing to do with internal or external balancing.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

  2. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  3. #2
    Senior Member motormonkey's Avatar
    Join Date
    Jan 2008
    Location
    SoCal
    Posts
    636

    Default

    You dont if you like to change bearings often. Used to build around the rules stuff with 283 or 289 balancers. Some big ,bad balanced strokers with the weights cut down, shakers untill reved up. HAHAHAHA. Worked fine for a maintanence motor. Some blower motors just a hub, but I always thought the belt helped some. Still not good on the bearings.
    I think you allready know the answer though.

  4. #3
    steelcomp was here
    Join Date
    Dec 2007
    Location
    n/e TN
    Posts
    26,280

    Default

    Blower belts definitely help absorb some of those vibrations, but on street blower deals, I use a balancer anyway.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

  5. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  6. #4
    Senior Member ol guy's Avatar
    Join Date
    Mar 2008
    Location
    Lake Elsinore Ca
    Posts
    3,814

    Default

    Quote Originally Posted by steelcomp View Post
    This is as simple an explination as it gets. Copy and pasted from TCI's site 'cause I just don't feel like typing it out tonight.
    Hope this helps in some understanding.

    Why do you need a vibration dampener or "harmonic balancer"?

    Engine speed slightly increases during power strokes and decreases during compression strokes. This is what causes twisting vibration of the crankshaft. In some instances, since the crankshaft drives the cam, crank vibrations can also cause instability in the valve train. The dampers and absorbers are designed to reduce these vibrations.

    What is crankshaft torsional vibration?

    Answer: Due to their mechanical design, all internal combustion engines will display crankshaft torsional vibration. This is due to the fact that torque cannot be applied to crankshafts from firing cylinders with steady pressure. It varies with the position of the crankshaft in relationship to each cylinder. As the piston rises and falls, so does cylinder pressure. The changing pressure, acting on the piston, results in forces transmitted along the connecting rod and applied to the crankshaft journal. In the operation of the crankshaft assembly, the forces reverse back and forth. The crankshaft reacts and transmits these forces that are indicative of crankshaft torsional vibration.

    This has nothing to do with internal or external balancing.
    A very well absorbed explaination. M

  7. #5
    Cantard 71hallett's Avatar
    Join Date
    Mar 2008
    Location
    snow bank
    Posts
    5,017

    Default

    God damit!!! And I though it was so you would have something to look at when your setting your timing.
    Quote Originally Posted by gn7 View Post
    It would be a balmy 85* in Steel's shop if he would move a little faster

  8. #6
    21 Daytona Outlaw's Avatar
    Join Date
    Dec 2007
    Location
    Artesia, N.M.
    Posts
    5,291

    Default

    Quote Originally Posted by 71hallett View Post
    God damit!!! And I though it was so you would have something to look at when your setting your timing.
    you have to look at your balancer to set your timing?

    this is the 21st century for Gods sake........
    #55

  9. #7
    Cantard 71hallett's Avatar
    Join Date
    Mar 2008
    Location
    snow bank
    Posts
    5,017

    Default

    Quote Originally Posted by Outlaw View Post
    you have to look at your balancer to set your timing?

    this is the 21st century for Gods sake........
    Well I stole the mag of Fred Flintstones car and........

    Of course some of you guys prob just like the fancy ones for doin your leak down tests. HAHAHA
    Quote Originally Posted by gn7 View Post
    It would be a balmy 85* in Steel's shop if he would move a little faster

  10. #8
    gn7
    gn7 is offline
    Senior Member gn7's Avatar
    Join Date
    Jan 2008
    Posts
    25,975

    Default

    Quote Originally Posted by 71hallett View Post
    God damit!!! And I though it was so you would have something to look at when your setting your timing.
    you need something to bolt your pulleys to, so it might as well be a $300+ harmonic damper. (please excuse me if I reframe from calling it a BALANCER



    100% free webcam site! | Awesome chicks and it is absolutely free! | Watch free live sex cam - easy as 1-2-3

  11. #9
    Lurker
    Join Date
    Dec 2007
    Location
    NC
    Posts
    1,417

    Default

    Quote Originally Posted by gn7 View Post
    please excuse me if I refrane from calling it a BALANCER

    No excuse needed for using a proper definition!!

  12. #10
    gn7
    gn7 is offline
    Senior Member gn7's Avatar
    Join Date
    Jan 2008
    Posts
    25,975

    Default

    Quote Originally Posted by steelcomp View Post
    This is as simple an explination as it gets. Copy and pasted from TCI's site 'cause I just don't feel like typing it out tonight.
    Hope this helps in some understanding.

    Why do you need a vibration dampener or "harmonic balancer"?

    Engine speed slightly increases during power strokes and decreases during compression strokes. This is what causes twisting vibration of the crankshaft. In some instances, since the crankshaft drives the cam, crank vibrations can also cause instability in the valve train. The dampers and absorbers are designed to reduce these vibrations.

    What is crankshaft torsional vibration?

    Answer: Due to their mechanical design, all internal combustion engines will display crankshaft torsional vibration. This is due to the fact that torque cannot be applied to crankshafts from firing cylinders with steady pressure. It varies with the position of the crankshaft in relationship to each cylinder. As the piston rises and falls, so does cylinder pressure. The changing pressure, acting on the piston, results in forces transmitted along the connecting rod and applied to the crankshaft journal. In the operation of the crankshaft assembly, the forces reverse back and forth. The crankshaft reacts and transmits these forces that are indicative of crankshaft torsional vibration.

    This has nothing to do with internal or external balancing.
    this is the exact reason I only run 32 cyl radial aircraft engines in all my boats



    100% free webcam site! | Awesome chicks and it is absolutely free! | Watch free live sex cam - easy as 1-2-3

  13. #11
    Senior Member motormonkey's Avatar
    Join Date
    Jan 2008
    Location
    SoCal
    Posts
    636

    Default

    If they werent needed, you woudnt see them on pro stock motors.

  14. #12
    gn7
    gn7 is offline
    Senior Member gn7's Avatar
    Join Date
    Jan 2008
    Posts
    25,975

    Default

    ok, so lets make this a little controversial. On a circle boat with the drive off the snout, N/A, does it belong on the front or flywheel, and why



    100% free webcam site! | Awesome chicks and it is absolutely free! | Watch free live sex cam - easy as 1-2-3

  15. #13
    Cantard 71hallett's Avatar
    Join Date
    Mar 2008
    Location
    snow bank
    Posts
    5,017

    Default

    Quote Originally Posted by gn7 View Post
    ok, so lets make this a little controversial. On a circle boat with the drive off the snout, N/A, does it belong on the front or flywheel, and why
    Who would do somethin as dumb as that in the first place? lmao
    Quote Originally Posted by gn7 View Post
    It would be a balmy 85* in Steel's shop if he would move a little faster

  16. #14
    gn7
    gn7 is offline
    Senior Member gn7's Avatar
    Join Date
    Jan 2008
    Posts
    25,975

    Default

    because we are dumb shits who are lost and confused. Thats why we keep driving in circles



    100% free webcam site! | Awesome chicks and it is absolutely free! | Watch free live sex cam - easy as 1-2-3

+ Reply to Thread
Page 1 of 3 1 2 3 LastLast

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

Please select your insurance company (Optional)

Log-in

Tags for this Thread

Digg This Thread

Posting Permissions

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
  •  
 

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95