found some help since im searchign for a air filter to flow good #s for my new motor may be helpful to some of you guys

To determine the maximum volume of air your engine will use, take the
displacement in cubic inches and multiply by the maximum RPM you operate
the engine at. If the engine is supercharged or turbocharged, divide
the pounds of boost by 14.7, add 1 to this answer, and multiply this
value by the CIDxRPM value. Divide by 3,456 for a 4 stroke engine, or
1,728 for a two stroke engine. This will calculate the maximum airflow
required by the engine.

Cubic Inch
Displacement x Max RPM x (B) lbs. boost
CFM =
-------------------------------------------------------
---------------- +1 = B

3,456 or 1,728
14.7

To determine what volume of air a given filter is capable of flowing,
multiply the diameter of the filter by its height, multiply by pi
(3.14), and multiply by 6. If the filter is a tapered cone (different
diameters at each end), add the diameter from the top and base together
and divide by two for an average diameter. Here are some examples:

Round Straight filter:
Round Tapered Filter:
CFM = dia. x height x 3.14 x 6
CFM = (dia. base + dia. top)

---------------------------- x height x 3.14 x 6

2

 

Pretty cool, Ill have to do some math now damnit.

 

Wow, awesome. I think i need a new filter....

 

OMG, i just saw your sig for the first time.
i would love to borrow it for a little while if i may.

 

Does the formula for the air filter flow consider "filter effeciency" or just the capacity for the given area?

 

Nice find Chase!

My filter is way small. Kind of proved the theory that the old Volant box and filter was a performance killer on the radix set-up.

 

the formula is from k & n so i would assume it applies to their filters.

 

Thanks!

 

so my filter more than doubles the required cfm's of my motor?? can someone check my math please. its not my greatest subject.
required cfm 294x5600/3456=476.4

The measurements of my filter.
Shape: Round tapered
Height (in): 9.000 in.
Inlet Flange Inside Diameter (in): 6.000 in.
Top Diameter (in): 4.500 in.
Bottom Diameter (in): 7.500 in.
Filter Color: Red
Filter Material: Cotton gauze
Quantity: Sold individually.
Notes: Filter end cap is chrome.

[(4.5x7.5)/2]x9x3.14x6=1017.36 cfm's

 

i got a headache now ty