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  1. 10-16-2004, 03:31 PM #1
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    63190
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    Attention Math gifted people:

    OK, I'm a hot rodder and can't do math very well with out a book of forula. I had it written down and lost it.

    I need to find RPM for a given tire size, MPH and constant.

    I found a formula that answers Final drive ratio, but am not math blessed enough flip it around to get what I want. Formula is:

    Final Drive Ratio=(Tire Diameter in Inches x RPM)/(336 x MPH)

    So if I wanted to find RPM would I do:

    RPM= ((final ratio)(336xmph))/ tire size ?
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  2. 10-16-2004, 03:33 PM #2
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    it would be


    final ratio / (336xmph) then that would be devided by tire size..
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  3. 10-16-2004, 03:38 PM #3
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    No...assuming your first equation is right it would be

    RPM = (Final Drive Ratio X 336 X MPH) / Tire Diameter

    so you were correct
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  4. 10-16-2004, 04:23 PM #4
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    63190
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    Quote Originally Posted by Billy_Bathgate
    No...assuming your first equation is right it would be

    RPM = (Final Drive Ratio X 336 X MPH) / Tire Diameter

    so you were correct
    Thanks. What's with the white donkey?
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  5. 10-16-2004, 05:07 PM #5
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    decadbal
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    since this is about math, i wont make fun of the math gifted, when it should be...gifted math....
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  6. 10-16-2004, 09:18 PM #6
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    Quote Originally Posted by Decadbal
    since this is about math, i wont make fun of the math gifted, when it should be...gifted math....
    Is this a play on words? That they, the gifted math people are giving me some math gift? Pretty astute.
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