09-24-2003, 08:50 AM
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CC Member
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Join Date: Dec 2000
Location: Broken Arrow. OK ( South Tulsa), USA,
OK
Cobra Make, Engine: 66 COBRA FE 427 /4SP. (HCS Coupe w/ 408 Stroker and TKO 600 -sold)
Posts: 5,595
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Not Ranked
How to measure Fuel Requirements...
I just got off the phone with my machinist discussing the amount of fuel needed for my 428CJ w/ 2X4s. He gave me this formula and I thought I would toss it out and see if anyone agreed or disagreed with him. Here goes:
Gasoline engines need 1/2 pound of fuel per horsepower hour!
My engine has 450 Hp so I would need 225 pounds of fuel/hr.
Gasoline weighs about 8.25 pounds per gallon.
225 pounds divided by 8.25 gives me about 27.27gal/hr max use
at WOT.
To check my fuel pumps effeciency I first calibrated my fuel pressure at each regulator to 5.5 PSI. Next I disconnected my fuel lines at the carburator. I got a new plastic 5 metre measurement jar and had my wife turn on my fuel pump for exactly 30 seconds while I held both carburator lines in the jar. I measured just under 2.25 quarts of fuel in 30 seconds. So this would translate to 32.73 gals/hr. Based on his calculations I am almost spot on my fuel pump size. I hope I am quoting his formula correctly.
Has anyone heard of this formula or method of determining fuel requirements?
Clois
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