139 mph on 3 cubic inches

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  • Paul Pless
    pinko commie tree hugger
    • Oct 2003
    • 124802

    139 mph on 3 cubic inches

    50 cc turbo charged Aprilia, giving 21 horsepower.







    Simpler is better, except when complicated looks really cool.
  • mikefrommontana
    Senior Member
    • Sep 2010
    • 989

    #2
    Re: 139 mph on 3 cubic inches

    Any idea what mileage that'd put out? Put a third wheel on that and it might be practical for other uses. Cool.

    Comment

    • Cuyahoga Chuck
      # 7727
      • Dec 2003
      • 12984

      #3
      Re: 139 mph on 3 cubic inches

      Back in about 1969 Suzuki developed a THREE-CYLINDER 50cc two stroke roadrace motor that churned out 19 HP normally aspirated. It is said to have been the highest specific output, (400 HP/liter) any piston engine ever achieved. The powerband was so narrow (about 500 RPMs) a 12 speed transmission was required. Unfortunately for Suzuki the FIM changed the rules for 50cc roadracers. One cylinder only and no more than six gears in the tranny.
      Sorry! No picture. You'll just have to use your imagination.

      p.s. By the 1980s 50 cc roadrace singles were converting to rotory valve and output was so high the bikes were capable of about 115 MPH.
      Last edited by Cuyahoga Chuck; 05-10-2012, 07:35 PM.

      Comment

      • Paul Pless
        pinko commie tree hugger
        • Oct 2003
        • 124802

        #4
        Re: 139 mph on 3 cubic inches

        The Suzuki RP68! I've seen one at the Barber Museum in Alabama.

        piston assembly. . .



        gearbox. . .



        Crazy!
        Last edited by Paul Pless; 05-10-2012, 07:58 PM.
        Simpler is better, except when complicated looks really cool.

        Comment

        • Cuyahoga Chuck
          # 7727
          • Dec 2003
          • 12984

          #5
          Re: 139 mph on 3 cubic inches

          The Suzuki RK 66 was a water-cooled two cylinder two-stroke with rotory disk that put out 18 HP @ 18,000 RPM thru' a 14 speed gearbox. Top speed was 110 MPH. This bike won the 50 cc world roadrace title in 1969 ridden by Hans Georg Anscheidt.
          Get the picture?
          Last edited by Cuyahoga Chuck; 05-10-2012, 08:08 PM.

          Comment

          • LeeG
            Senior Member
            • May 2002
            • 72777

            #6
            Re: 139 mph on 3 cubic inches

            that's a big gas tank

            Comment

            • skuthorp
              Senior Member
              • Jan 2002
              • 73594

              #7
              Re: 139 mph on 3 cubic inches

              BF might like one of those setups in his posties bike

              Comment

              • Cuyahoga Chuck
                # 7727
                • Dec 2003
                • 12984

                #8
                Re: 139 mph on 3 cubic inches

                In 1908 Glen Curtiss did a world motorcycle record of 137 MPH on the sand at Ormond Beach, Florida, using an 8 cylinder engine of his own design.
                That was about the end of his two-wheeled career. From then on it wa airplanes.
                Last edited by Cuyahoga Chuck; 05-10-2012, 08:21 PM.

                Comment

                • B_B
                  Banned
                  • Sep 2001
                  • 6506

                  #9
                  Re: 139 mph on 3 cubic inches

                  Originally posted by Cuyahoga Chuck
                  .... The powerband was so narrow (about 500 RPMs) a 12 speed transmission was required. ...
                  16, IIRC

                  Paul, what fuel was used in the record breaker? Gasoline or some other?

                  Comment

                  • PeterSibley
                    Senior Member
                    • Dec 2001
                    • 70993

                    #10
                    Re: 139 mph on 3 cubic inches

                    21 speed on the Honda IIRC, a power range of 20,500 to 21,000rpm.

                    The main thing that landspeed record attempt has is a CD of about 2.5 Have a look at this calculator to work it through.
                    '' You ain't gonna learn what you don't want to know. ''
                    Grateful Dead

                    Comment

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