|Posted: Jul 17 2006 at 9:35pm | IP Logged
I am adding these links to this post as per kcidmil, as i guess he figured this is one area where people look to gain a little bit of performance by adding a different filter. this was from a prior post that i made after doing a lot of reading that i found online about some air filters, i think some of y'all will find it interesting in the flow vs filtration enigma that becomes all of us wanting more flow w/o sacrificing quality filtration, now at first some of y'all will say..well yeah..you can't have one gain w/o giving up the other even just a little bit, i.e. one of hte laws of motion..for every action....(i know that's a strectch but it fit here) the following list of links is from some of the reading i found.
First a study from a mechanical engineer who did a test study on air filters that was semi scientific in nature to determine drop in flow rate for various types of filters (paper/foam/gauze). what he found in his little study might surprise some of y'all especially as far as comparison in flow rates. (tho i'd be interested to see what i could find as far as more scientific and controlled studies being a scientist myself)
www.bobistheoilguy.com/airfilter/airtest1.htm, be sure to read all teh way down to the end of the page for more links coinciding with this test
and then a study done on the AEM Dryflow filter with various parameters and even a study that AEM funded comparing various competitors filters in filtration and flow rate (change in pressure), the above studies were done at an independent research lab called Southwest Research Institute (SwRI) who is a respected testing and research institute in San Antonio Texas with affiliate branches in other parts of the country that does tests and research in various fields
new and cleaned test on the AEM Dryflow-
coarse dust test- http://trucks.aempower.com/dryflow/SWRIresults_9inchdryflow_ coarsedust.pdf
severe abuse test-
Test of various competitors filters (sans foam filter)-
now you'll note that after looking at the test results in pressure drop, that the filters from the first link avg'd about a difference in pressure of about 2, and the numbers i see for initial pressure drop for the dryflow is 1.31 or something around there for the new filter then 1.58 after "severe abuse" well if you compare that to the bob's test conceding that w/o any filter the pressure drop was about 5.1 inches of water, then add the 1.58 to the 5.1 and you end up with 6.68 inches of water, now granted this is pretty liberal extrapolating of data, but just suppose you go there with that...and then look at the number for the amsoil 2 stage foam filter, it's test results were for the foam and the amsoil foam was avg 6.5 inches of water drop and that was the best flowing foam filter, and second best flowing filter i believe in that test result, so that would put the AEM dryflow just slightly behind that in flow quality after having the crap beat out of it really, and if you took the new flow rates of 1.31 you'd end up with a total of 6.41 inches of water which would flow better than any of the foam filters in that test.
the biggest surprise to me out of all of this was that all of those filters had very very close flow rates for the stock filters in the www.bobistheoilguy.com test and the paper filter seemed to have the best filtration from the empirical data given in the results, i.e. the visual test,
one question i do have is whether or not it was a test of the CAI brute force intake with the dryflow filter or just the filter itself..i believe it was the filter itself from my reading. as this is just food for thought and something i found interesting and thought i'd share it with y'all, probably some of y'all have read it
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