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Balance yes/no???

Discussion in 'Engine Building' started by cheese9988, Dec 7, 2006.

  1. cheese9988

    cheese9988 Senior Member VIP

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    Well I finally found a good crank so I can get my bearings and put everything together. But first should I get everything balanced? The place that has been doing most of my work said I should get it done. It would include the crank, rods, pistons, flywheel and pully. They said they only need one set of rings. The rods and pistons are aftermarket and are much heavier than the stock. Worth it, or waste of my money?
     
  2. lsvtec

    lsvtec GNU/Linux Evangelist

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    As for worth it I can't say for certain because I chose to do it. I would go ahead and do it.
     
  3. cheese9988

    cheese9988 Senior Member VIP

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    Ah ok, so I assume, the crank, rods and pistons.
     
  4. cheese9988

    cheese9988 Senior Member VIP

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    Its a remanufactured crank, think thats ok?
     
  5. hondasniper

    hondasniper Engine Builder

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    As long as everything weighs extremely close, you don't need to get it balanced. Unless you have had the crankshaft knife edged or something, but the stock crankshaft is already balanced and so are the aftermarket crankshafts unless it is stated otherwise. Inline 4 cyl motors balance themselves out. When you say remanufactured, do you mean they had to do some welding, or just ground down the journals??
     
    Last edited: Dec 13, 2006
  6. Exodus

    Exodus Junior Member

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    Actually, inline four engines are inherently out-of-balance, more so than most, if not all other engine configurations. V bank engine have decreased harmonics because of combustion cycles happening every 90 degrees on opposite sides of the engine, instead of every 180 degrees in a straight line (which is transversely mounted to the chassis by generally shit mounts as well).

    Have your bottom end balanced. Do some homework, and know what you need to get done for this engine to last, and know what the people you give your engine to can do, have a reputation for, etc...
     
  7. Exodus

    Exodus Junior Member

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    I heard by nature, the longitudinally mounted V6 RWD is one of the most balanced engines by design. I don't know anything about the I6 or V12 though. Makes sense when you think about it.
     
  8. MikeBergy

    MikeBergy Blah blah blah....

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    how are your aftermarket pistons heavier than stock? And the only thing they do when they balance the pistons and rods will be weigh them and make sure they all weigh the same on their scale. I'd get the flywheel balanced. If it is cheap insurance, just have them do it all, and make sure they give you the data sheet for what the numbers were before and after balancing.
     
  9. cheese9988

    cheese9988 Senior Member VIP

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    We have scales at work that go out 5 decimal places, would it be worthwhile for me to check the weight between the pistons/rods to see if its worth getting those balanced? The crank I will do either way, have no way to check those.
     
  10. cheese9988

    cheese9988 Senior Member VIP

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    The pins are already pressed in, so thier setup already. How close should they be to each other in weight would you think?
     
  11. jamesA

    jamesA Well known pissed off telephone guy VIP

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    The most balanced engine configurations are flat fours, as in a Subaru engine.
     
  12. cheese9988

    cheese9988 Senior Member VIP

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    Ah ok, is that because the small differences in weight between the pistons and rods might create a little vibration? Maybe the place I'm taking it to can take them apart to balance it, they would know best.
     
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