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  • Crankshaft lightening

    Any BTDT?
    I was looking at some companies and there prices are not half as bad as what i thought

    I saw Mark H has had is done, the up side is less mass for the engine to spin but the only down side i can envisage is that engine braking is going to be reduced?

    Any thoughts on this?

    Cheers James
    Chef

  • #2
    Becareful where you go for this, I'd seek advice from the obvious e.g Corey, Doug etc, our 5 cyl is hard to do correctly due to the firing order, not the same as doing a regular 4/6/8 cyl. Ask if they have done it before?!

    There are other possible problems/down sides, stalling, rough tickover, gearbox syncros get a harder time, less torque/ acceloration.

    Jay

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    • #3
      Go careful on the lightening, or the balancing man may not have much left to play with.
      I'm not sure about engine braking though. A lower compression ratio should give you less engine braking/less pumping losses IIRC.
      SS

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      • #4
        Give Phil a call at Bassett down. He can get the crank lightened and then balance the assembly for you.

        Bassett Down Balancing
        Unit 19 Lower Bassett Down Workshops
        Basset Down
        Wroughton
        Swindon
        Wiltshire
        SN4 9QP
        Tel: 01793 812331
        91 Modded 3B
        14 A6 Avant Black Edition

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        • #5
          Originally posted by SteveH View Post
          Give Phil a call at Bassett down. He can get the crank lightened and then balance the assembly for you.

          Bassett Down Balancing
          Unit 19 Lower Bassett Down Workshops
          Basset Down
          Wroughton
          Swindon
          Wiltshire
          SN4 9QP
          Tel: 01793 812331
          Yep

          he did mine and he knows what he is doing
          Mark - Modded

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          • #6
            Originally posted by Mark Halligan View Post
            Yep

            he did mine and he knows what he is doing
            Thanks Mark,

            Do you find the engine braking is reduced alot?
            Chef

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            • #7
              Engine breaking is more a ****ion of the pumping effect of the engine on a closed throttle and is effected more by compression. so lowering the compression ratio will have a bigger effect.

              Jay

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              • #8
                Originally posted by terrybullwon View Post
                Thanks Mark,

                Do you find the engine braking is reduced alot?
                James

                I haven't noticed any difference in engine braking.

                Cheers
                Mark - Modded

                Comment


                • #9
                  Are you going for this James? And did you get a price?

                  Comment


                  • #10
                    I think so Jamo,

                    Price is about for Crank lightening and edging and balance £220, which i thought was quite resonable.

                    But my "list" is getting bigger and the power is creaping up, so i am either going to slow the build down or punish a few cards
                    Chef

                    Comment


                    • #11
                      I know what you mean, I think i'll add it to my big list of things.

                      Was hoping to have the car started this month but may have to delay a while to save up even more

                      Comment


                      • #12
                        Are you guys using a lightweight flywheel in conjunction with the lightened crank?

                        Cheers,

                        Mark.
                        91CQ20v - Gone to a new home
                        93UR-S4 - The Magic Carpet
                        94S2Bus - The Emerald Express

                        Comment


                        • #13
                          has anybody a good answer, why better the light crankshaft?
                          i read a few books about it in motorsport, but nothing any good in serious racecars.
                          --------------------------------------------------------
                          Real carbon parts for S2 and RS2. Check Carbondesign on facebook

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                          • #14
                            Lighter crank = less intertia = better acceleration
                            Cheers'en, AndyC
                            1994 ABY Coupe - Projekt Alpinweiss

                            Comment


                            • #15
                              Originally posted by Andy_Casey View Post
                              Lighter crank = less intertia = better acceleration
                              how about the ballance between rods+pistons/crank.(i mean weight difference)
                              the pistons wants to fly up from the cylinder.
                              why has the high rpm race engines very hevy weight crank?
                              --------------------------------------------------------
                              Real carbon parts for S2 and RS2. Check Carbondesign on facebook

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