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Old 03-02-2015, 06:08 AM
mikeinatlanta mikeinatlanta is offline
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Quote:
Originally Posted by trularin View Post
I did my own calculations.

(( CID x Max RPM ) / 3456 ) * 1.1 = CFM...I use this for the cubic feet.

Then the square area of the filter AND the filter level.

If your filter is very fine, like 5 microns, you are going to need a larger area to allow the same amount of air to flow through.

Then there is the accumulated time to a reduction in flow. If you use an area that equals your calculation, you are going to be at a loss as soon as you pull in air and filter it.

Not sure if this hellps anyone, but it is interesting when you are thinking of putting in cold air intake system.

I think level of filtration and filter area is where the calculators have issues. One 14X4 may have double the effective filter area when compared to another one of the same size. If you don't know the media flow characteristics new vs. after some use, the calculators are only valuable for new filters.

All of this is why I am of the belief that most cobra owners are losing much more to filtration than they would like to believe. I would love to have gone with a 14X4 but the math clearly supported the need for 14X5 for a 700 hp engine.
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