what is the formula to find the area of a circle with a 55 mm diameter????

Adger Smith · 07-21-2008, 01:39 AM

According to: Bob Szabo article

One method for ball-parking the size of a hood scoop is to look at the column of air that the hood scoop takes in from the speed of the vehicle. That amount is a function of the engine air demand, the velocity of the vehicle, and the inlet scoop area. The equation for that relationship is:

vehicle velocity = engine air demand / scoop area

Try this:
vehicle MPH = (engine cfm / scoop area in square inches) x (60 x 1/5280) / (1/144)

where:

60 = minutes (m) per hour (H)
1/5280 = miles (M) per foot (f)
1/144 = square feet per square inch
(60 x 1/5280) / (1/144) = 1.64
vehicle MPH = engine CFM x 1.64 / scoop area (square inches)

07-21-2008, 01:39 AM	#6
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,446 Likes: 575 Liked 880 Times in 311 Posts	Re: what is the formula to find the area of a circle with a 55 mm diameter???? According to: Bob Szabo article One method for ball-parking the size of a hood scoop is to look at the column of air that the hood scoop takes in from the speed of the vehicle. That amount is a function of the engine air demand, the velocity of the vehicle, and the inlet scoop area. The equation for that relationship is: vehicle velocity = engine air demand / scoop area Try this: vehicle MPH = (engine cfm / scoop area in square inches) x (60 x 1/5280) / (1/144) where: 60 = minutes (m) per hour (H) 1/5280 = miles (M) per foot (f) 1/144 = square feet per square inch (60 x 1/5280) / (1/144) = 1.64 vehicle MPH = engine CFM x 1.64 / scoop area (square inches) __________________ Adger Smith (Former SS) Last edited by Adger Smith; 07-21-2008 at 01:47 AM. Reason: sp