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Yamato 80 megaphone measurements

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  • Yamato 80 megaphone measurements

    Would any of you fine folks happen to have a stock 80 expansion chamber/megaphone laying about and could measure. I have the upper aluminum manifold but I need to know total length and the diameter at the bottom of the pipe.

    Thanks

  • #2
    P Meg overall length 10.625 0.062
    P4 Meg. Small Dia. 1.614 0.050
    P5 Meg. Large Dia. 2.598 0.050

    Info here pgs 78 - 83:

    https://www.apba.org/documents/13180...l%20Manual.pdf
    "Keep Move'n" life is catching up!
    No man's life, liberty or property are safe while the legislature is in session.

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    • #3
      Thank you, never even thought to look in the rule book. This spec racing stuff is new to me.

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