new peak power RPM formula

Discussion in 'Dirt Bike Mods & Maintenance' started by jaguar, Feb 14, 2017.

  1. jaguar

    jaguar Subscriber

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    Any math experts here? How do you simplify this equation to solve for RPM?
    6.089/RPM + 1.98RPM = 14,918
    It's part of my new formula for determining peak power RPM by transfer port duration and transfer/boost area. thanks in advance


     
  2. jaguar

    jaguar Subscriber

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    I figured it out.
    I've analyzed numerous engines and found that using (time x area) / cc is a good formula for the exhaust port (when using blowdown area) but not for the transfers. I tried various formulas for the transfers and couldn't find one that worked on all engines. The only key I could find is that no transfers have less than a 1.43ms "transfer time" (see definition on my site). I offer a free Excel spreadsheet calculator on my site for people interested in correct modification of their engine.
     

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