Anyone using K&N airfilter?
Posted January 24, 2001 - 08:45 PM
Posted January 25, 2001 - 03:26 PM
I have used K&N's before in my XR600's and was quite happy with them. They do tend to clog if the conditions are dusty, but they flow air way better that foam. Typically I would run the K&N after rainy days when the desert is wet, and change to a twin-air for a dry dusty desert.
Believe it or not - I could tell the difference between the K&N and twin-air filters. Kind of like removing the snorkel & lid from the WR airbox.
Just my opinion.
Posted January 25, 2001 - 03:30 PM
[This message has been edited by Ron in SoCal (edited 01-25-2001).]
Posted January 25, 2001 - 07:39 PM
There is a K&N model out for the YZ/WR.....it is model YA 4098. It is expensive - nearly $60 retail. I think they flow better than a foam filter, but I'm concerned about passing dirt under high dust conditions. That is the reason for the post. Thanks for your responses - this forum continues to be a great source of information.
Posted March 09, 2001 - 02:43 PM
Posted March 12, 2001 - 09:27 AM
Posted June 04, 2001 - 04:08 PM
Our filters are tested by an outside, independent laboratory. They have
been proven to stop at least 99% of particles on a SAE dust test. This test
uses particles as low as the 0 - 5 micron range and goes up to 20 microns.
For comparison, a paper filter also stops 99% on the same test and the OEM
minimum standard is 96%. Foam is generally the worst media with a typical
efficiency rating of 75 - 85%. To get higher ratings, the foam must be more
dense and therefore way more restrictive. The "tack" characteristic of a K&N
allows for increase filtration without loss of flow as well.
The testing procedure used is SAE J-726 using ISO Test Dust. This test
is the standard of the air filter industry. The test procedure consists of
flowing air through the filter at a constant rate (airflow rate is
determined by the application) while feeding test dust into the air stream
at a rate of 1 gram per cubic meter of air.
As the filter loads with dust the pressure drop across the filter is
increased to maintain the prescribed airflow rate. The test is continued
until the pressure drop increases 10" H2O above the initial restriction of
the clean element (in this case .78" to 10.78" H2O). At this point the test
is terminated. The dirty filter element is then weighed. This weight is
compared to the clean element weight to determine the total Dust Capacity.
The amount of dust retained by the filter is divided by the total amount of
dust fed during the test to determine the Cumulative Efficiency.
The K&N filter achieved the following results:
Dust Capacity: 305 grams
K&N Cumulative Efficiency: 99.05 %
K&N Initial Pass Efficiency: 97.11 %
OEM Paper Cumulative: 99.29 %
OEM Paper Initial Pass: 96.47 %
Holding the filter to the light is useless, pin holes are normal. That
is what makes a K&N filter. There are actually hundreds of microscopic
fibers that cross these holes and when treated with oil, capture and hold
the very fine particles. On the same hand, they allow the filter to flow
more air than paper or foam. The filter is 4 ply cotton gauze unlike some
competitors synthetic material filters. The synthetics do not have the very
small fibers that natural cotton does. Also, the oil can be pulled off of a
foam filter contaminating electronic sensors. It will absorb into cotton
and stay in the media. In fact, Honda and Toyota only recommend K&N filters
when using aftermarket high flow filters as K&N is the only brand of filter
the oil does NOT come off of. They will not cover a failed sensor if foam
filters were used.
We got started over 30 years ago making filters for motorcycles and off
road racers. The filters did so well that these guys wanted them for their
cars and trucks. We started making filters for these applications and here
we are today. If they did not work, we would not still be here and growing
We now make filters for Chrysler/Mopar, Ford Motorsports, Edelbrock,
Rotax Engines, and Harley Davidson. We come as original equipment on the
2000 Ford Mustang Cobra-R. We even made filters for the Apache helicopters
used in Desert Storm because of maintenance problems with the original paper
design. If they work in these conditions they will work for you. Wherever
you read that our filters do not do an adequate job is not true.
Posted June 04, 2001 - 07:45 PM
I never seemed to have this problem with K&Ns installed on the dual Weber setup on my VW Baja Bug years ago. Dust/silt conditions probably were not as bad though. Maybe being in a confined air box versus out in the open like I had them on the bug makes a difference? The filters would be completely caked with dirt, but the little VW would keep on running pretty strong.
I have never had this sever a clogging problem with dual element foam filters in any of my bikes, therefore, I don't put K&Ns in dirtbikes any more.
Posted June 05, 2001 - 03:26 PM
-just my two cents
Posted June 06, 2001 - 04:48 AM
Posted June 06, 2001 - 10:53 AM
Anyone read David Vizard's flow and clogging comparison between K & N, Foam and paper element filters? If not, you should, no bullshit facts!
Posted June 06, 2001 - 01:53 PM
You need to use RUSH filters. They are ribbed, yes, like the condom...
The reason, most of the dirt forms ont he peaks and tens to keep the troughs (Dips) clearer/cleaner. That is what they are called here in Australia.
Posted June 06, 2001 - 04:13 PM
I had a K&N on an '85 XR250, and I did have to clean it more freuently than a foam element, and I had a lot of dirt in the engine problems when I would get into water. Never did estblish where it was coming in. Makes me suspect the K&N.
Posted June 06, 2001 - 04:15 PM
Posted October 11, 2001 - 01:44 AM
Posted October 11, 2001 - 06:53 AM
Posted October 11, 2001 - 08:12 AM
Y2K WR400FM,Answer top tree w/Accu-Trax clamp,Pro-Tapers(CR-Hi w/ EE handguards),Devol Rad. & frame guards, Guts tall soft foam w/ ballistic cover, 14/52 w/DID VM X-Ring, Kouba-T,Michelin M-12's ft.& rr.,12 oz. flywheel weight, Zip-Ty Racing Link & Shark Fin(plus everythhing else cool that Ty offers), Cycra front rotor guard and T.M. Designworks Chain guide, buffer & chain wheels. Street legal except for the non-"DOT" tires.
Posted October 11, 2001 - 04:34 PM