Thread: Project "Left Overs"
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01-17-2011 06:16 AM #11
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- Car Year, Make, Model: '33 HiBoy Coupe, '32 HiBoy Roadster
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Jim,
Originally Posted by J. Robinson
I'm confused...
5280 x 60 x 12 / pi =121,008.4...
Anyway, I missed the part that says "OD ratio". DUH!!
If you take my calculated rpm of 3119 x the .64 overdrive it comes out to 1996. Our figures confirm each other then... Where they got the 336 still eludes me though.
Not to beat a dead horse, but the string [(5280ft/mi x 1hr/60min x 12in/ft) divided by pi] has a numerator of 5280 divided by 60 times 12 which equals 1056, which divided by pi equals 336.13. In the original formulayou're entering MPH so the values in the 336 factor get you to a numerator of revolutions and speed in inches per minute with pi being dimensionless. Then when you divide by the denominator tire diameter in inches you're left with RPM.RPM = (mph x Differential Gear Ratio x 336 x OD Ratio)/Tire Diameter in InchesLast edited by rspears; 01-17-2011 at 07:39 AM.
Roger
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I believe this was somewhere around 2015, Rick, Rosie and Johnboy
John Norton aka johnboy