Not really, efficiency testing has been formally done on the K&N, it is not a great air filter. This does not mean that it won't provide acceptable service for folks living in non-dusty environments like TiGeo though (which he and I have discussed numerous times in these exchanges).
Quoting myself:
There was a test report that used the ISO test dust, I've quoted it in the now locked thread from 2018:
Let's look at the dirt passed and time to restriction limit data.
- The duration of the test was 60 minutes and during that period, the amount of dirt passed by the Donaldson unit was 0.4g.
- The K&N passed 7g of dirt within 24 minutes and hit the restriction limit.
If we break this down to g/minute passed, a simple metric, we can perhaps gather some clearer data comparing the most efficient filter in the test, which also loaded up the slowest, and one of the least efficient.
1. Donaldson PowerCore: 0.0067g/min loading rate
2. K&N oil cotton gauze: 0.2917g/min loading rate
This means the Donaldson is 43.5x more efficient.
Ignoring the loading limit, if we just look at the performance within a 6 hour window:
1. Donaldson PowerCore: 2.4g of dirt passed
2. K&N oiled cotton gauze: 105g of dirt passed
That's a HUGE difference.
The Donaldson would have to be run for 262.5hrs; 11 DAYS to pass the same amount of dirt as the K&N, or, looked at from the other direction, the K&N passes in 8.2 minutes what it takes the Donaldson 6 hours to pass.
This is in relation to the ISO filtration test:
Originally Posted by TiGeo You mean by ~3% less than a paper filter? Did you ever bother reading the actual report that graphic that you so proudly posted come from? Here's a mirrored copy at Nicoclub: https://www.nicoclub.com/archives/kn-vs-oem-filter.html You also left out the graphics that...
bobistheoilguy.com
The graphs (which have been posted on here many times):
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