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  1. J

    Go Kart #1

    Mechanical Power, Force, Torque Sid, you are correct that the TC belt does, in fact slip. You are also correct in pointing out that it is a simple matter of changing a sprocket a tooth or two to compensate for the slippage. In anticipation of this I have already purchased two jackshaft drive...
  2. J

    Go Kart #1

    Sid, as you have pointed out there are significant power losses in the TC. However, power loss does not involve a loss of torque. As you may know, power is torque*rotationalSpeed. Actual power loss means that the rotational speed will be lowered when compared to a theoretically lossless TC, but...
  3. J

    Go Kart #1

    Sprocket Speed Holes The final drive sprocket I bought was solid plate steel, and weight a ton - so I cut some speed holes into it :thumbsup:
  4. J

    Go Kart #1

    Finished the rear engine/drive train frame I finally got around to cutting some metal on this kart. This is the rear frame which ties the engine, drivetrain, and rear axle together. It will be attached to the rest of the kart via a 4-link suspension. I used Fabroman's (I think) idea about the...
  5. J

    (: Just SOME Of My Plans :)

    FreeRunner, every jackshaft introduces parasitic power loss (~8%), so you don't want any more than absolutely necessary. Also, conventional torque converters introduce even more parasitic loss, although I haven't been able to find any numbers on this. I suspect the losses are hideous at the...
  6. J

    Torque, HP, RPM, Weight, Top Speed Calc

    Chill? I guess I don't understand why anyone would think that towing a kart behind a car was a big deal. Tie a rope between them, with a scale such as this http://www.zoro.com/taylor-mechanical-hanging-scale-32kg70-lb-3070/i/G3012606/ in-line, and you are ready to go. Measure the force on a...
  7. J

    Torque, HP, RPM, Weight, Top Speed Calc

    You could always ... You could always buy a bunch of sprockets, and try them all to see which one works best. I find it much less expensive to use a calculator. :thumbsup:
  8. J

    Torque, HP, RPM, Weight, Top Speed Calc

    If you want to measure friction losses after the TC, just remove the TC belt and tow your kart + driver behind a car with a force guage on the tow line. Record the towing force at several different speeds. Speed * force = power required to drive the kart at a given speed (don't forget your...
  9. J

    Spark Arrestor in OMB Stage 1 Performance Kit

    No, I don't think what you found is the same. I was not able to find the 3S or 5S products on the SuperTrapp website, but it would appear that these are better suited to the utility engine application. I find it a little strange that the 3S series has a 1-1/2" inlet, as that is large enough to...
  10. J

    Speed calculator

    From an engineering standpoint, mild steel is a very cost-effective and structurally sound material to use for building a go-kart. In particular: mild steel tubing is cheap, very tough (resists fatigue well), and ductile (easy to form). The ductile nature of mild steel means that it will bend...
  11. J

    Spark Arrestor in OMB Stage 1 Performance Kit

    I have a need for a US Forest Service approved muffler as well. The best thing I can find is a SuperTrapp unit, which costs ~ $240 http://www.supertrapp.com/product_sections/cat.asp?CatID=35
  12. J

    Lifan 125 buggy(ish) kart

    That arrangement will not provide any roll stiffness. You will have to provide all needed roll stiffness with an anti-sway bar or similar. ---------- Post added at 08:44 AM ---------- Previous post was at 08:41 AM ---------- I am curious about the drive housing on your rear axle. Is there a...
  13. J

    Differential Brakes (Will this Work?)

    If I were you, I'd get rid of the diff, and replace it with a one-piece axle. http://www.bmikarts.com/Axles_c_194.html
  14. J

    60HP 2-stroke Boat outboard engine clutch option?

    The Comet 103 series torque converters can handle up to 120 HP. http://www.hoffcocomet.com/epiphanyweb/flexpage.aspx?ID=75
  15. J

    Differential Brakes (Will this Work?)

    For safety you need a rotor attached to the left & right axle 1/2 shafts. This because, as stated previously, with the rotor mounted on the diff carrier, you cannot produce any more braking force than 2x the tire with the LEAST traction. So, if one tire is on mud or ice (or anything slippery)...
  16. J

    Honda estorm 125cc

    That motor should make a fine little shifter kart. If I were you, I'd use a hand-lever clutch on a butterfly steering wheel.
  17. J

    Dem Chinese nuked themselves

    Beg to differ Yes there is. Ride any of the modern 450cc motocrossers in the dirt, and they will scare the sh*t out of you :surrender:
  18. J

    Making a Go KArt 4wd?

    Scrub Radius Explained Here you go: http://www.ls1gto.com/forums/attachment.php?attachmentid=145250&d=1323194045
  19. J

    Making a Go KArt 4wd?

    Scrub Radius Much? Looks like the scrub radius on the front wheels is close to a foot - I'd hate to try and drive that thing over rough ground! :ack2:
  20. J

    Making a Go KArt 4wd?

    Grab the drivetrain out of one of these ATV's, then lengthen the 1/2 axles to adapt to the increased width of a go-kart. https://www.google.com/search?q=4wd+atv&safe=off&client=ubuntu&espv=2&biw=1246&bih=649&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwjv-4LAoLvKAhXDGR4KHdElB80QsAQILw
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