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  • #16
    Originally posted by FireFighter:
    Rotating mass is 10 lbs. Vs 100 Lbs. dead weight.
    That rule is for parts rotating at engine speed... Flywheels for example. I went around quoting that rule for a long time too, until I researched it some more.

    The effect is less at tranny/driveline speed.

    And it's even less at wheel speeds.

    A typical tire will go around a little more than 800 times in a mile. Compared to the engine turning 3000-6000 times a minute during a drag race.
    \'98 A4 Camaro v6-&gt;v8 conversion, and STS kit next<br />v6: 13.6 Powerdyne, 13.2 150 shot, 13.8 120 shot, 14.3 85 shot, 15.7 stock<br />v8(na): 12.18@113, 392rwhp<br />Moderator on <a href=\"http://www.mtfba.org\" target=\"_blank\">www.mtfba.org</a> and <a href=\"http://www.frrax.com\" target=\"_blank\">www.frrax.com</a> (Road Race & Autocross)<br /><a href=\"http://community.webshots.com/user/johnduncan10\" target=\"_blank\">Car pics</a>, <a href=\"http://www.trscca.com\" target=\"_blank\">TN Region SCCA</a>

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    • #17
      Originally posted by FireFighter:
      Rotating mass is 10 lbs. Vs 100 Lbs. dead weight.
      That rule is for parts rotating at engine speed... Flywheels for example. I went around quoting that rule for a long time too, until I researched it some more.

      The effect is less at tranny/driveline speed.

      And it's even less at wheel speeds.

      A typical tire will go around a little more than 800 times in a mile. Compared to the engine turning 3000-6000 times a minute during a drag race.
      \'98 A4 Camaro v6-&gt;v8 conversion, and STS kit next<br />v6: 13.6 Powerdyne, 13.2 150 shot, 13.8 120 shot, 14.3 85 shot, 15.7 stock<br />v8(na): 12.18@113, 392rwhp<br />Moderator on <a href=\"http://www.mtfba.org\" target=\"_blank\">www.mtfba.org</a> and <a href=\"http://www.frrax.com\" target=\"_blank\">www.frrax.com</a> (Road Race & Autocross)<br /><a href=\"http://community.webshots.com/user/johnduncan10\" target=\"_blank\">Car pics</a>, <a href=\"http://www.trscca.com\" target=\"_blank\">TN Region SCCA</a>

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