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SV650 flywheel rotor lightening

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  • #61
    Originally posted by macop1104 View Post

    My bike with the BDK is a 2 mil SBK with lw crank and carrillo rods. crank rods pistons went out to crank specialist and got balanced. I have no vibration. no problem with over rev. Biggest advantage is there is very little engine braking no need for bliipping on downshift, no need for crappy slipper clutch.
    Nice to see,it reassures me!
    I really like the no need for blipping.
    About the little engine braking,well,SV has too much for my taste anyway,so can't go wrong with less!
    Do you have pic of your crank?
    Whom did you use for lighten crank+balance?
    Marine,falicon or local machinist to you?

    Comment


    • #62
      Originally posted by TOLAROS View Post

      Nice to see,it reassures me!
      I really like the no need for blipping.
      About the little engine braking,well,SV has too much for my taste anyway,so can't go wrong with less!
      Do you have pic of your crank?
      Whom did you use for lighten crank+balance?
      Marine,falicon or local machinist to you?
      http://foxperformanceengines.com/crankshaft.html

      There's a pic of the SV crank on the link.

      Comment


      • #63
        Originally posted by macop1104 View Post

        http://foxperformanceengines.com/crankshaft.html

        There's a pic of the SV crank on the link.
        !!!
        That crank looks incredibly light,nice job!Did you raise the idle speed?
        It is a 1st gen crank on picture.You use 1st gen or 2nd gen and did same thing to him?

        Btw when you say engine braking you mean just close throttle or starting downshift?I ask so i know we mean same thing.
        Compared to say an inline4 sport bike,it has more or less engine braking?
        2mil pistons.Are they heavy?You run compression over 13:1?
        Thanks

        Comment


        • #64
          Originally posted by TOLAROS View Post
          !!!
          That crank looks incredibly light,nice job!Did you raise the idle speed?
          It is a 1st gen crank on picture.You use 1st gen or 2nd gen and did same thing to hi

          Btw when you say engine braking you mean just close throttle or starting downshift?I ask so i know we mean same thing.
          Compared to say an inline4 sport bike,it has more or less engine braking?
          2mil pistons.Are they heavy?You run compression over 13:1?
          Thanks
          when downshifting, I can just dump the clutch without upsetting the chassis. Way less engine braking than a 4 cyl.
          some 2 mil pistons are lighter than stock, some are way heavier. the pistons I use are light. I'm running 13.5:1 compression. This is a race bike that gets torn down every winter. tic tic tic tic boom!

          Comment


          • #65
            Originally posted by macop1104 View Post

            when downshifting, I can just dump the clutch without upsetting the chassis. Way less engine braking than a 4 cyl.
            some 2 mil pistons are lighter than stock, some are way heavier. the pistons I use are light. I'm running 13.5:1 compression. This is a race bike that gets torn down every winter. tic tic tic tic boom!
            I get it,you have different priorities than me.

            Nevertheless here's my experience with stock SV engine braking(just closing throttle) from many tours around Greek mountains and highways.
            SV engine braking is wayyy more than lets say fazer600 or GSXR!
            It can be tricky if you roll off the throttle suddenly when engine revs are around max torque,it can actually cause rear wheel skid(depending or tarmac condition).
            There was instance when after getting back in line after overtaking,buddy who was following almost ran into me.
            He later told me that my brakes don't activate the brake light and that I should check them!
            Guess what:I didn't brake...

            If you start downshifting it gets even worse(unless it's from high revs and you play with clutch lever).

            So judging from your experience,if I decide to lighten it it could be somewhat beneficial.

            I also think that less engine braking whet let go the gas,can make smaller the chances of rotor/clutch twisting and breaking crank (can be wrong on that opinion though).

            One more thing:2nd gen crank has beveled the edge that is around crank pin,see pics.
            Can I duplicate 2nd gen design on that area to 1st gen crank without strength compromise?
            Attached Files
            Last edited by TOLAROS; October 13th, 2017, 08:21 AM.

            Comment


            • #66
              Here is most recent pic of my crank after the WERA GNF. There is evidence of massive rcank flex. Maybe I'll send it to Zoran and he can add it to his crank garden...

              Comment


              • #67
                Originally posted by TOLAROS View Post

                I get it,you have different priorities than me.

                Nevertheless here's my experience with stock SV engine braking(just closing throttle) from many tours around Greek mountains and highways.
                SV engine braking is wayyy more than lets say fazer600 or GSXR!
                It can be tricky if you roll off the throttle suddenly when engine revs are around max torque,it can actually cause rear wheel skid(depending or tarmac condition).
                There was instance when after getting back in line after overtaking,buddy who was following almost ran into me.
                He later told me that my brakes don't activate the brake light and that I should check them!
                Guess what:I didn't brake...

                If you start downshifting it gets even worse(unless it's from high revs and you play with clutch lever).

                So judging from your experience,if I decide to lighten it it could be somewhat beneficial.

                I also think that less engine braking whet let go the gas,can make smaller the chances of rotor/clutch twisting and breaking crank (can be wrong on that opinion though).

                One more thing:2nd gen crank has beveled the edge that is around crank pin,see pics.
                Can I duplicate 2nd gen design on that area to 1st gen crank without strength compromise?
                that is a Gladius crank. 17 SV crank is similar, but not the same. I have no experience with this crank, but we are building an 09 SV and a 17 SV for the new Moto America twins class. The 17 SV crank is a bit heavier but the design looks like it gives more support to the crank pin area. We will see.

                Comment


                • #68
                  Originally posted by macop1104 View Post
                  that is a Gladius crank. 17 SV crank is similar, but not the same. I have no experience with this crank, but we are building an 09 SV and a 17 SV for the new Moto America twins class. The 17 SV crank is a bit heavier but the design looks like it gives more support to the crank pin area. We will see.
                  Huge crack!
                  Can't see whole crank pin but there's no sign of insufficient oiling,pin is still shiny.

                  How many years/hours/miles whatever you measure did that crank last?

                  The more you lighten a crank,the more precise you have to be when you weight match components because the same imbalance affects the lighter crank the most.
                  A stock crank tht weighs say 5kilos,won't feel much even if components are off by say 5gr.
                  A lightened crank that weighs 2.5kilo will surely feel.


                  That castle shape cranks have under the pin on the left side could be due to the way the motor is mounted on the frame.At least that's what engineering professor told us...

                  Hope your new bike lasts more!

                  Comment


                  • #69
                    Have same example
                    Attached Files

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                    • #70
                      Here are pics from my brand new crank!

                      Attached Files

                      Comment


                      • #71
                        Originally posted by TOLAROS View Post
                        Huge crack!
                        Can't see whole crank pin but there's no sign of insufficient oiling,pin is still shiny.

                        How many years/hours/miles whatever you measure did that crank last?

                        The more you lighten a crank,the more precise you have to be when you weight match components because the same imbalance affects the lighter crank the most.
                        A stock crank tht weighs say 5kilos,won't feel much even if components are off by say 5gr.
                        A lightened crank that weighs 2.5kilo will surely feel.


                        That castle shape cranks have under the pin on the left side could be due to the way the motor is mounted on the frame.At least that's what engineering professor told us...

                        Hope your new bike lasts more!
                        crank rods and pistons complete went out together. Crank was lightened and polished, then balanced all together. 13.5:1 compression and north of 90hp. The stock components just cant handle the abuse. The cases also cracked. It was fast while it lasted, which wasn't long! Only 5 race weekends

                        Comment


                        • #72
                          Originally posted by macop1104 View Post
                          crank rods and pistons complete went out together. Crank was lightened and polished, then balanced all together. 13.5:1 compression and north of 90hp. The stock components just cant handle the abuse. The cases also cracked. It was fast while it lasted, which wasn't long! Only 5 race weekends
                          At least you found the engine limits!
                          So the death cause was piston fail, breakage,PTV collision or crank just died first and destroyed everything with him?
                          Overev due to downshifting or it just happened?
                          Stock revlimiter at 11k or higher?

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                          • #73
                            crank flex, metal fatigue.

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