Turbocharger for those that need it.

Discussion in 'General Questions' started by darwin, Nov 13, 2012.

  1. darwin

    darwin Well-Known Member


  2. darwin

    darwin Well-Known Member

    They don't recommend that for under 150ccs. I don't think that will stop some folks here.
     
  3. Fabian

    Fabian Well-Known Member

    That's sensational!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
     
  4. Ludwig II

    Ludwig II Member

    Think this through. Honda don't use them on any bikes now, and Honda know a lot of what there is to know about bike engines.
     
  5. Fabian

    Fabian Well-Known Member

    But it "looks nasty good" and imagine that beautiful (non-return) blow-off sound when snapping the throttle shut - i wouldn't care if the engine with turbo made less horsepower than in naturally aspirated form.

    Sometimes aural and aesthetic qualities are worth more than optimal engineering principles!
     
  6. Racie35

    Racie35 Member

    you could do it with a small ducted fan from an rc jet if you just wanna blow some positive pressure in and feel some boost....be tricky to regulate though.
     
  7. motorpsycho

    motorpsycho Active Member

    even if you could get it mounted up to a china 2 stroke AND have it actually make some boost, the china bottom end would not hold up to the boost pressure.
    you'd have to fabricate an intake manifold and exhaust to make it work and to mount it, but even if it was just for looks and noise, it would look totally cool hanging off a china 2 stroke.
     
  8. JVROOM

    JVROOM Member

    Looks interesting, but I didn't quite understand how it's powered, from the engine magneto? I thought we looked anything up to this power source it would kill the engine? Thank you John
     
  9. motorpsycho

    motorpsycho Active Member

    Really? A turbo does not require any electrical power. Its driven off of tbe exhaust gasses. Exhaust blows into one side of the turbo and it spins an impeller. This impeller has a shaft which has a second impeller on the intake side which also spins. The intake air is compressed by this impeller and forced into the engine (boost) . The more air and fuel that you can force into the cylinder, the more power the engine will make. A turbo is definitly the one thing that can give you "free" horsepower because it uses unwanted exhaust gasses & pressure to make it work.
     
  10. Josh Moon

    Josh Moon Member

    need a pressurized oil feed for the turbo too, and turboing a smoker is alot easier said than done, be better to put it on a big thumper as a draw-thru carb setup.
     
  11. BarnstormCyclewerks

    BarnstormCyclewerks New Member

    plus, a two stroke can't be turboed, the boost would just blow right out the exhaust port. 4 stroke would be a different story.
     
  12. Ludwig II

    Ludwig II Member

    Ah! But you can! It needs proper inlet valves, but you can, and if you're using direct fuel injection, you can use it on an ordinary 2 stroke to completely scavenge burnt gases from the cylinder.
     
  13. Josh Moon

    Josh Moon Member

    arctic cat snowmobiles have been selling turbocharged two stroke snowmobiles for years. what they do is tune the pipe for the same rpm that the clutch locks at, that way the exhaust pulse from the expansion chamber acts as your exhaust valve. while it is alot harder to do, you can turbo a smoker, but it will have a narrow power band, which is why you have to use a CVT and tune for the rpm of your CVT
     
  14. Ludwig II

    Ludwig II Member

    There is a company somewhere making a 4 cyl 2 stroke diesel aero engine, no ports, all valves in the head, and I would presume, a lot of scavenge air being blasted through. For the 2 stroke to achieve it's full potential, people need to accept it will have a 4 stroke level of complexity.
     
  15. Josh Moon

    Josh Moon Member

    Chevy used a two stroke diesel, they would not run with out a supercharger or turbocharger, the intake was ports at the bottom of the cylinder with valves up top, but with out some forced induction there was no way to scavenge the cylinder. http://www.youtube.com/watch?v=lcBiCyX9lnk
     
  16. Ludwig II

    Ludwig II Member

  17. BarnstormCyclewerks

    BarnstormCyclewerks New Member

    ha, learn something new every day.
     
  18. Ludwig II

    Ludwig II Member

    It only had one crankshaft, 3 cylinders and the paired pistons shared a common bore. Go on, you work it out.
     
  19. Fabian

    Fabian Well-Known Member

    variable exhaust port geometry solves all of the issues of running a turbocharger on a 2-stroke, like a rehashed version of the Yamaha YPVS system, but you wouldn't be able to purchase your Chinese bicycle engine kit for $200.

    Direct fuel injection would also solve most of the emissions problems with a turbocharged 2-stroke.
    The technology exists to solve all the problems, just that it doesn't come cheap!
     
  20. Ludwig II

    Ludwig II Member

    You can still build a simple 2 stroke that accepts supercharging. It would be a split single. 2 cylinders normally working off the same crank throw, bores parallel, and sharing the cylinder head. One cylinder then runs slightly ahead of the other in the rotational cycle, and functions as an exhaust valve.

    This gives diagrams of different ways to do the same job.

    [​IMG]
     
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