Engine Balancing

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  • jonnaz
    S2Forum Enthusiast
    • Aug 2009
    • 158
    • Country: United Kingdom

    #1

    Engine Balancing

    im putting the original 3b flywheel from the car onto a diffrent crank do i need to get them balanced or are the both balanced to 0 indevidually?
    the reason im fitting a diffrent crank is because the original one was cracked due to bearing faliure.
  • volcano rs
    S2Forum Fiend
    • Jun 2005
    • 2265
    • Country: United Kingdom

    #2
    no need to balance you should be ok

    Comment

    • jonnaz
      S2Forum Enthusiast
      • Aug 2009
      • 158
      • Country: United Kingdom

      #3
      eb

      the car will be running arrount 400 bhp i forgot to mention that

      Comment

      • Error404
        Super Moderator
        • Mar 2007
        • 19789
        • Country: United Kingdom

        #4
        have you planned for stronger rods?
        Panthero Coupé quattro 20vt
        Indigo ABY coupé
        Imola B6 S4 Avant

        Comment

        • GazzaG60
          S2Forum Freak
          • Mar 2007
          • 4133
          • Country: United Kingdom

          #5
          put rods in the rest will hold. 400 is not that much. pay attention to the fueling side. pump, injectors remap or standalone.

          getting a turbo an manifold to do that is just a matter of £ or € rather. this is the cheap bit. the new exhaust at 3" will cost as much.standard inlet is fine, intercooler is around maxed there.

          Comment

          • SteveH
            Super Moderator
            • Jul 2003
            • 4460
            • Country: United Kingdom

            #6
            If your building a new engine for 400 bhp, why risk loosing the whole lot due to potential component failure?!

            If you're going to do it, do it properly. Get the crank crack tested, bearing journals checked and polished and then get the whole lot balanced. Will cost a few bob more, but at least you have peace of mind that it's all checked and healthy.
            91 Modded 3B
            14 A6 Avant Black Edition

            Comment

            • jonnaz
              S2Forum Enthusiast
              • Aug 2009
              • 158
              • Country: United Kingdom

              #7
              the crank has been cracktested and jornals polished. bores on the block have been honed, got forged h beam rods and forged pistons as i might want more power in future. i am building it prperly no cut corners

              just want to know if engine will be out of balance due to changeing the crank?

              Comment

              • volcano rs
                S2Forum Fiend
                • Jun 2005
                • 2265
                • Country: United Kingdom

                #8
                Originally posted by jonnaz
                the crank has been cracktested and jornals polished. bores on the block have been honed, got forged h beam rods and forged pistons as i might want more power in future. i am building it prperly no cut corners

                just want to know if engine will be out of balance due to changeing the crank?
                if you are going this far then balance it with clutch plate and front pully also included

                Comment

                • Ross
                  S2Forum Possessed
                  • Aug 2005
                  • 3399
                  • Country: England

                  #9
                  As said, balance it! I've changed the single mass flywheel - zero balanced with clutch - onto my stock ABY engine and it's OK but I can tell it's not as smooth revving as my old engine, which had forged internals and was fully balanced. Cost £150 and worth every penny.
                  AUDI - saving Dad's from minivans since 1994

                  Comment

                  • GazzaG60
                    S2Forum Freak
                    • Mar 2007
                    • 4133
                    • Country: United Kingdom

                    #10
                    yep if you have done the lot its not worth not getting it balanced.

                    Comment

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