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Thread: piston size

  1. 05-17-2005, 06:51 PM #1
    xX-400racer-Xx's Avatar
    xX-400racer-Xx
    xX-400racer-Xx is offline Senior Member
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    piston size

    i was wondering if an 87mm piston was a 440 with stock head. this is what i thought but a website i found the other day said that it was a 416.
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  2. 05-17-2005, 07:02 PM #2
    FoxProRacing
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    a piston that have a 87mm bore is a 416

    87/2 = 43.5

    3.1416*43.5*43.5 = 5944.6926

    5944.6926 * 70mm (stroke) = 416128.482

    416128.482 / 1000 = 416.128cc
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  3. 05-17-2005, 07:08 PM #3
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    87mm is 416
    88mm is 426
    89mm is 440
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  4. 05-17-2005, 07:13 PM #4
    FoxMxRiders
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    Originally posted by MX610EX
    87mm is 416
    88mm is 426
    89mm is 440
    89mm is not a real 440 ... just a 435

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  5. 05-17-2005, 08:17 PM #5
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    Originally posted by FoxMxRiders
    89mm is not a real 440 ... just a 435

    Thats why you gotta specify for an 89.5mm piston for a true 440
    -Paul

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