Check Your Fuel
In the Dec. '07 issue on page 51 ("How to Design a Fuel System") you have a formula for gallons/hour that seems wrong (I went back and forth between it and several other calculations, since I had not seen the formula before this article). I think the formula given does not need the factor of 2 at the beginning; just HP times BSFC divided by 6 equals GPH. Otherwise, thanks for a good article. I'm building a '66 Chevelle with a 454 bored and stroked to 489, topped by an 8-71 blower and twin 750s. Maybe 900 to 1,000 hp!
-Gersh Lundberg, Paducah, KY
What we didn't explain very well is that the multiple of 2 in the equation (2 (flywheel hp x 0.5 BSFC/6 = GPH) adds enough pump to compensate for friction in the lines, g-forces, low system voltage, and whatever else might conspire to starve the system for fuel. The industry uses it as a safety measure.
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Who: Donald Joseph
What: '72 Buick Gran Sport
Where: Long Island, NY
Why: It's unmodified! Yup, it's an original 350 car with Ram Air in burnished copper with a saddle-black interior. The cool options include the vinyl top, bumper exhaust, A/C, tilt, and speed-limit alarm.
Did you know that a speed-limit alarm was an option on this car? It would encourage us to
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What: '66 Dodge Dart 270 wagon
Where: Parkesburg, PA
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The wagon is an original A/C car and a daily driver.