Quote:
Originally Posted by Unique427
Reprinted from a previous CC post:
The "Turkey Pan" (cold air box) was one of the reasons that the 427 performed like it did.
Doing the math helps us understand why. A hood scoop opening of 2"x10" or 20 sq. in.
moving through the air for one mile at 60 miles an hour takes in nearly 8,000 cubic feet of air.
Your 427 cu. in. engine, traveling the same speed, turning 2500 rpms is only using
350 cubic feet or so of air. When sealed against the hood with a rubber gasket
(which most folks don't like doing because the gasket chafes the paint) forms a high
pressure area between 2-5 psi of cold air pressure, depending on how fast you are moving.
The excess cold air spills out through the bottom opening, thus cooling the intake manifold
and the air charge running through it. It creates "free horsepower" and the only drawback
to this is that you must be moving!!
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Not sure on who wrote this, but the maths is wrong.
20 square inches = .1388 square feet.
60 miles per hour = 1 mile per minute.
1 mile = 5280 feet.
5280 x .1388 = 732.8 cubic feet. PER MINUTE.
So where did 8000 cfm come from?