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post #1 of (permalink) Old 04-16-2001, 07:35 PM
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K&N or UNI Airfilter?

Ok I'm back again. What does everyone prefer for air filters? I have a K&N on it now but with all this money I just put into it (around $900) I want the best protection I can buy! Just wondering what every one uses and why. Thanks for the help.

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post #2 of (permalink) Old 04-16-2001, 10:13 PM
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Re: K&N or UNI Airfilter?

The better filter depends on the conditions you ride in.
I prefer uni filter's because they are better at getting the fine dust/silt around here out of the air, I tried a K&N on one bike I had, and I found this dust in the intake track - It went right through that filter.

83 ATC 250r (with many extra parts), 83 ATC 185s, 85 Ktm 350mxc.
post #3 of (permalink) Old 04-16-2001, 10:28 PM
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Re: K&N or UNI Airfilter?

I'll be riding in just your average dirt and dust. Because my bike has such a large engine in a small frame it dosn't have an air box for right now. I plan on trying to make one form it. Any way it has a K&N on it now with a prefilter cover over it. Do the uni filters only work with the air box? I'm thinking I just going to stick with the K&N.

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post #4 of (permalink) Old 04-16-2001, 11:02 PM
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Re: K&N or UNI Airfilter?

My Banshee has a UNI 2 in 1 with pre filter , it restricts air a little more than the K&N but it works better , I have a plastic manifold that goes on both carbs from the air filter ( no box )

Ride hard, Lifes short
post #5 of (permalink) Old 04-16-2001, 11:44 PM
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Re: K&N or UNI Airfilter?

I run a UNI filter with an outer wear on top of it. I ride in sand dunes, and graded dirt roads. I appreciate the extra protection.

KNs suck fine dust particles. Yes they flow more air.

I run the Toomey 2:1 Uni foam filter(like raptor rider) with an outerwear for extra protection. My motor makes enough HP that i dont worry about the restriction with a foam fitler.


Got sand?

post #6 of (permalink) Old 04-17-2001, 09:20 AM
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Re: K&N or UNI Airfilter?

i too like the UNI's better than the K&N's, because of the better protection. i ride in the average dirt and dust, nothing extreme. on my banshee i have the 2 into 1 intake setup with one carb and the proflow mount with 1 UNI airfilter with outerwears cover. like cleartoy, my motor makes enough juice for me so i dont have the need for a K&N's little extra power. i would pick engine longetivity any day over a little more power. (and only a little)

<font color=blue>'93 Yamaha Banshee (Trinity Stage IV)
'00 Yamaha Blaster</font color=blue>
post #7 of (permalink) Old 04-17-2001, 10:56 AM
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Re: K&N or UNI Airfilter?

I run the UNI filter on mine also, and for added protection I take a fine layer of wheel bearing grease and layer the intake plastic with it, this will pick up the dirt that comes through the filter (which is not much at all)...

The K&N that I had on it that inner layer of thin grease was always covered with dirt and grit...

So my suggestion is the UNIfilter because it is a duo foam filter which is SLIGHTLY more restrictive then the K&N filter but more safe. The thin layer of grease I do recommend to everyone out there as an added line of defense....

The good Lord giveth and the Eco-Nazi's Taketh away!
United we stand..Divided we fall..LETS UNITE!
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post #8 of (permalink) Old 04-17-2001, 11:11 AM
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Re: K&N or UNI Airfilter?

Cool thanks guys I think it is going to be the UNI then good thing I didn't order the K&N already. So it will work even with out the air box? Hope so if not I guess I'll jut send it back or take it back to the store.

post #9 of (permalink) Old 04-17-2001, 11:40 AM
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Re: K&N or UNI Airfilter?

I asked K&N about the possible occurrence of more dirt passing thru the filter and got this reply:
"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 %
OEM Paper Efficiency: 99.29 %
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
every year.
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.
Our filters have a 10 year / million mile warranty. The dealership
may not void the warranty per Federal laws. The Moss-Magnuson Warranty Act
of the Fair Trade Commission states that if a part is not covered under
warranty, the consumer may use any brand they choose to. Air filters are
not covered under the warranty so you are free to use any brand you choose.
We make the filters for Mopar Performance and Ford Motorsports. I find it
highly unlikely they would endorse a product that causes problems with their
vehicles. "

post #10 of (permalink) Old 04-17-2001, 12:01 PM
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Re: K&N or UNI Airfilter?

OK my quad right now has a K&N with an outerwear over it. I think I will just stay with that but buy another filter so I have a back up and I will just change after every ride and clean the extra one. I called the tech. help line for Dennis Kirk and they said I need my air box to run a UNI.

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