Re: Blasphemer!

[Steve Makohin <wateredg@xxxxxxxxxxxx>]

On 1/7/04 6:10 AM, Wayne Woodruff wayne@xxxxxxxx wrote:

>>One caveat: If you fill up at a pump that has a single fill hose, you will
>>get 3/4 to 1 gallon of whatever grade was previously pumped.
>>Bruce   '94 R1100RS
>
>Very true indeed!

Didn't someone on the "other" list disprove this thinking with a bit of 
simply math that went something like this:

 o Assume the hose is 8 feet long (96 inches)

 o Assume an inside hose diameter of 3/4"

 o Use the following formula to calculate the area of a circle:
     (pi)r^2   or "pi" x Radius squared

 o Substituting values, the area of the hose's cross section is
   approximately 0.44 square inches

 o Multiply by length of hose, 96 inches, to get volume of
   approximately 42.24 cubic inches

 o 1 U.S. gallon = 231 cubic inches

 o 42.24 cubic inches (the fuel in a fuel pump filler hose)
   divided by 231 cubic inches in a US gallon = 0.18 gallons,
   or just under 1/5 of a gallon.

If we assume an even worse case of an inside fuel pump hose diameter of 1 
inch, and a hose length of 10 feet (120 inches, WOW!), that still gives 
us a volume of only 0.4 US Gallons, or about half of the believed amount.

If we assume the worst case as depicted above while pumping an intended 4 
gallons of premium fuel, the regular grade fuel quantity represents only 
about 10% of the fuel filled, as opposed to the worst case of 25% as 
believed.

Disclaimers:
 - Verify the math yourself before trusting Internet posters
 - Assumptions made may not depict your specific scenario
 - The described effect, that is low grade fuel being received when
   premium grade is desired, is decreased as a proportion as the
   quantity of fuel pumped increases.
 - Offer prohibited where void

- -Steve

 Oakville, Ontario, Canada
 2000 R1100S/ABS, Mandarin

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