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Thread: forced air induction for Tzr

  1. #17
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    Default Re: forced air induction for Tzr

    Hi Ricky



    it not about the engine doing less to get the air in it's about trying to get more air in your engine fullstop. - more air = more oxygen = bigger bang = more power



    if you want to do that you are looking at porting and bigger carbs - don't go there(yet)



    try the plenum as an experiment by all means - answer your own question( but watch your jetting be careful you don't melt pistons) - i don't honestly think you'll see any significant improvement and you certainly won't be able to race in F3



    Tony

  2. #18
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    Default Re: forced air induction for Tzr

    you could buy one of these sets of plans?



    http://www.esuperchargers.com



    maybe ?




  3. #19
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    Default Re: forced air induction for Tzr

    Whilst asleep driving on the M25.

    Thought Y not mount the engine behind the fan (carbs facing fan)with the fan at the front.(opposite type blades fitted.)

    When someone complains u got forced air.Just tell them your actually stuck in reverse and your flying backwards.

    Admittedly a bit difficult to see where your going.







    Make note.:--



    Must get life.





    Craig




  4. #20
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    Default Re: forced air induction for Tzr

    two stroke tune pipes scavenge the cylinder, via the shock wave created by the exhaust gases anyhow. it also couldnt suck in, as paul explained which port being open etc.

  5. #21
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    Default Re: forced air induction for Tzr

    the TZR is not a piston ported engine (reed valved) and charging does work in moderation. (have seen it in action) but the gains are not huge. you are better off just porting and setting the thing up correctly.



    also to get it to work properly you have to place the whole carb in a presurised box or all you do is blow the petrol out of the carb bowl via the overflows.





    also to get any serious power you have to REDUCE the compression ratio or you get knock and detonation due to the peak in cyl pressure being too high.



    genral theorey being that by increasing the volume you can get the more stuff in there at the same pressure (with out knock)meaning when burned you have a higher average pressure thoughout the power stroke or a higher break mean effective pressure (bmep). but the peak presure is still the same.



    confused? - tough. find a book on thermodynamics.



    JB


  6. #22
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    Default Re: forced air induction for Tzr

    The TZR **is** piston ported. It works in the same way as a non-read valve engine with the exception that only the intake tract is not closed by the piston skirt. The main advantage of the read valve is to allow a longer intake period for the crank induction, hence improving the volumetric and 'stuffing' efficiency. The fact still remains that the exhaust port opens first followed by the transfer port(s), and the exhaust port is therefor the last to close. Consequently it is not possible to significantly increase the supplied pressure to the upper cylinder. With very carefull design of the exhuast, tuned to provide high back pressure, it is theoretically possible to gain advantage from low pressure boost, but even the mighty Yamaha gave up on this one.



    It is possible to improve the stuffing efficiency slightly which would give more power, but as you rightly say the easiest way to do this is with "porting". I would not however recommend this to anybody unless they have some experience of tuning 2-strokes, or are willing to sacrifice heads and barrels to experimentation. It is very easy to wreck 2-stroke performance by opening ports too far, reducing velocities in the intake tracts and obtaining overall lower volumetric efficiency.

  7. #23
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    Default Re: forced air induction for Tzr

    whos the clever one!




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