Author: The Ace
Subject: K & N filter or not
Posted: 26 Jun 2018 at 11:57am
Well there are also plenty of tests which show an increase in performance, and the difference has been measured to be about 3-4%, which you could attribute to circumstances, weather conditions, or even measuring/human error, but since the difference is almost always in the positive side, you could accept the hypothesis that the change is also positive (rather than zero or negative).
Edited by The Ace - 32 minutes ago at 12:08pm
Subject: K & N filter or not
Posted: 26 Jun 2018 at 11:57am
Well there are also plenty of tests which show an increase in performance, and the difference has been measured to be about 3-4%, which you could attribute to circumstances, weather conditions, or even measuring/human error, but since the difference is almost always in the positive side, you could accept the hypothesis that the change is also positive (rather than zero or negative).
For instance
https://www.sciencedirect.com/science/article/pii/S2212017316301475/pdf?md5=d2f70e632c706b1c583eb769b594ce7a&pid=1-s2.0-S2212017316301475-main.pdf
As for flow, since you mention Bob, in his test http://www.bobistheoilguy.com/airfilter/airtest2.htm he actually measured K&N to be the best flowing, not flow worse than paper, and paper flowed worst than any aftermarket filter, so maybe you are referring to some other test ?
 ...For one, there is very little pressure drop across any air filter, and the difference between the best (K&N) and worst (paper) is very small. Yes as total power output increases, air flow increases, and differential pressure would also increase. So a K&N probably does yield some power on higher output race motors where every last ounce of power must be squeezed out......If you are buying a high performance filter for airflow, K&N is tops in this test... ...So it is safe to say from the first test, that the K&N is still the best flowing filter... |
The fact that paper is used by almost all manufacturers does not mean that it's the best performance-wise, but that it's the best jack-of-all-trades and ticks all the boxes which all manufacturers have to tick. Things like weather conditions, filtering, engine noise levels, ease of servicing, costs etc, all these play a role.
As for the Ford intake, since I saw with my own eyes how restrictive is the stock intake tract (as is the case with almost all stock intake tracts ![Wink]( "Wink")
), the upgrade to the ST intake and box is my next step, which combined with the aftermarket Raimair cone filter should provide the best solution
), the upgrade to the ST intake and box is my next step, which combined with the aftermarket Raimair cone filter should provide the best solutionEdited by The Ace - 32 minutes ago at 12:08pm