Exhaust/expansion chamber calculator - need engine info

Discussion in 'Intake & Exhaust' started by el Diablo Guapo, Sep 9, 2017.

  1. el Diablo Guapo

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    I am playing with this expansion chamber calculator - but i need infrormation about the china girl engine.

    I don't feel like taking apart my bike since it is working right now, and at least one piece of info I have no idea how to get or really what it is... but someone i bet here prolly knows this info or where/how to get it.
    (i am looking at you Bairdco)

    I need:
    exhaust duration
    exhaust port width
    exhaust port height
    jug wall thickness at the port

    coefficient (what is that even?)

    I just want play around with potential configurations, compare existing products to it or maybe make a thing

    BTW this a free app on google play, i am running it on my phone

    Thanx!
    el
     
  2. el Diablo Guapo

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    Okay, so I think I am down to just needing to figure out the exhaust duration

    coefficient is, according to the app instructions, the "width" of the effect across various RPM - with .1 being narrow and 2.0 being broad

    this calculator seems to create really long expansion tubes, if 1,000 mm = ~39 in, but it may be my duration number


    I will follow up

    el
     

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