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JOES31 · 07-15-2014, 10:50 PM

ISO5011 protocol is what K & N as most filter manufacturers use for testing. Coarse particle testing using 5 to 150 micron particles will produce a filtration between 90 to 99% for a standard paper element. The same test, if memory serves me, K&N will filter between 95 to 99% with 200 to 300 percent more air flow. That is why they were developed and used for racing engines. Now that is what I remember to be the case but it's been a while.

So you can get the same efficiency with less restriction with a K&N. So as the above post correctly stated they were mainly made for engines operating most of the time at its maximum rpm range which demands the maximum CFM flow rate of the specific engines.

Being the filtration rate is the same or better with less restriction, that is the reason I feel it is a good choice.

07-15-2014, 10:50 PM	#35
JOES31 Senior Member Join Date: Apr 2014 Location: La Verne California Posts: 283	Re: Air filter for Model A ISO5011 protocol is what K & N as most filter manufacturers use for testing. Coarse particle testing using 5 to 150 micron particles will produce a filtration between 90 to 99% for a standard paper element. The same test, if memory serves me, K&N will filter between 95 to 99% with 200 to 300 percent more air flow. That is why they were developed and used for racing engines. Now that is what I remember to be the case but it's been a while. So you can get the same efficiency with less restriction with a K&N. So as the above post correctly stated they were mainly made for engines operating most of the time at its maximum rpm range which demands the maximum CFM flow rate of the specific engines. Being the filtration rate is the same or better with less restriction, that is the reason I feel it is a good choice.