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Thread: 2-stroke excel for ports, heads and pipes

  1. #1
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    19th June 2011 - 00:29
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    2-stroke excel for ports, heads and pipes

    My 2-stroke spreadsheet is ready (for now at least), so I'm throwing it on the net so everybody can use it.
    It contains pages for ports, the head and FOS pipe
    On the seperate ports pages (exhaust and transfer), it calculates the STA numbers (Specific Time.Area) of your ports and you can matcch them to the target's, determinned by the BMEP
    On the Head page, you can design your head and it calculates the MSV (Mean Squish Velocity) 100% accurtly with Blair
    On the FOS-pipe page, it calculates a Frits Overmars FOS pipe, and you can ad a Wobbly-duct , and you can add extra header/diffusor/baffle sections to the pipe.

    you are free to do with it what you want, as long as it is not for commercial use. If somebody has idea's to improve or add extra features, please share so we can all benefit.
    In the manual I've tried to explain how it works, please read it first before you ask questions.
    If somebody has any idea of how to print a portmap to correct size, please let me know, as I don't have a clue right now.


    excel : http://users.telenet.be/jannemie/Jan...oke%201.0.xlsm
    manual : http://users.telenet.be/jannemie/Jan...oke%201.0.docx

  2. #2
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    20th April 2011 - 08:45
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    Quote Originally Posted by JanBros View Post
    My 2-stroke spreadsheet is ready (for now at least), so I'm throwing it on the net so everybody can use it....you are free to do with it what you want, as long as it is not for commercial use.
    excel : http://users.telenet.be/jannemie/JanBros%202-stroke%201.0.xlsm
    manual : http://users.telenet.be/jannemie/Jan...oke%201.0.docx
    Bravo Jan ! I know that it has been a tremendous amount of work.
    I noticed that you refer to my 'Leaning Tower of Pisa' story. If you wish, you can download the complete Pisa-story from https://drive.google.com/drive/folde...rNTk89_KgwgWof , from the folder 'FOS Tips & Concepts', and bundle it with your masterpiece.
    In fact, you can use everything you find there and use it, provided credits are respected.
    You might also take a look at the disclaimer accompanying the 'FOS Exhaust Concept'; it is a bit more extensive than the older version that you quoted.

  3. #3
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    1st November 2019 - 14:09
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    Thank You Very Much

  4. #4
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    20th January 2010 - 14:41
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    Great stuff

  5. #5
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    19th June 2011 - 00:29
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    apparently I seem to make the same mistake over and over : I keep forgetting the variable for the FOS pipe is speed of sound and not exhaust gas temperature. It had no effect on the workings of it all, but I've corrected it now in the manual and the spreadsheet and uploaded corrected versions ;-)

  6. #6
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    23rd March 2015 - 21:24
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    what an effort! thanks for making it available for everyone!

  7. #7
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    Thank You Very Much

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