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· Smokin Vendor
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Hi originally bought the K&N filter only and not much changed but cleaning the filter. I then converted to the K&N direct air intake and thats where you notice the breathing difference. Sounds better and breaths much better as is sucking in much more air. So to answere your question, its more hype on just using the filter. While your at it (if you havent done it yet) change the exhaust and cause you got air coming in and need air to go out!! I got the Magna Flows as didnt want too radical a sound but the butt looks good.
 

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Hi originally bought the K&N filter only and not much changed but cleaning the filter. I then converted to the K&N direct air intake and thats where you notice the breathing difference. Sounds better and breaths much better as is sucking in much more air. So to answere your question, its more hype on just using the filter. While your at it (if you havent done it yet) change the exhaust and cause you got air coming in and need air to go out!! I got the Magna Flows as didnt want too radical a sound but the butt looks good.
It has an afte rmarket exhaust, havent figerd it out yet it's polished stainles with oval tips, look's like B&B
 

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K&N flow more but do not filter as well
go with a Donaldson
cut or take out the fog surrounds and you get cold air where you need it
 

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K&N flow more but do not filter as well
go with a Donaldson
cut or take out the fog surrounds and you get cold air where you need it

A stock pleated paper is 99.9% efficient whereas a K&N is only 98% efficient. Which means the K&N will allow 20 times as much dirt to pass thru it. People often think 98% efficient is real close to the stock 99.9% but it's not. Take the 2% and divide that by .1% and you get 20. That 20 represents the filtering difference between the two. I wouldn't run a K&N if you paid me because of it's poor filtration.
 

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A stock pleated paper is 99.9% efficient whereas a K&N is only 98% efficient. Which means the K&N will allow 20 times as much dirt to pass thru it. People often think 98% efficient is real close to the stock 99.9% but it's not. Take the 2% and divide that by .1% and you get 20. That 20 represents the filtering difference between the two. I wouldn't run a K&N if you paid me because of it's poor filtration.
They have a pre filter available for them, but don't know the figures of how much the improvement it is. Off Roaders use the foam pre filter with the K&N, and it seems to work.
 

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K&N's Allow 20 TIMES More Dirt To Pass Thru Them

They have a pre filter available for them, but don't know the figures of how much the improvement it is. Off Roaders use the foam pre filter with the K&N, and it seems to work.

The problem with the "pre" filters is they only filter out rocks and small birds and don't even begin to stop the super-fine dust that wears out your rings and cylinder walls. It is the talcum-powder fine dust that passes right thru the K&N's whereas the stock pleated paper elements catch most of it. Most heavy equipment uses an inner and outer filter; the outer filter being the same 99.9% efficiency as your stock element and the inner element providing even finer filtration. And even with those two elements you'd be shocked to see how much fine dust still gets through. If a reusable filter was the most efficient kind of filter the big three and all the foreign manufacturers would be using them.

As far as stopping sand the K&N's do a great job but it isn't sand that wears out your engine. It's the super-fine airborne dust that is suspended in the air; dust that isn't heavy enough to drop out of suspension when the wind picks up. The kind of airborne dust that accumulates on the tables and windowsills and floors inside your home and workplace. When that super-fine dust enters your engine it mixes with the thin coating of oil on your cylinder walls then becomes a very efficient lapping compound.

K&N advertises their filters will provide 20% more airflow than a pleated paper filter of equal size. It only takes a little bit of thought to realize how they accomplish that (duh).
 

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Are these figures based on the K&N being oiled?

Yes, but even when properly oiled they pass 20 times more dirt because anything that can out-flow a pleated paper element of the same size has to have bigger "openings". K&N started making filters for the off-road vehicles so their filters could be cleaned and reused rather than bringing along a dozen spare paper filters. In off-road racing the front tires stir up an incredible amount of dust so a pleated paper filter will plug up quickly. The advantage of the K&N's "20% more air flow" is they will continue to pass enough air to feed the engine well after a typical paper element would have failed. As the K&N's can be cleaned and re-oiled the racer in a Baja 500 or Baja 1000 can easily clean and re-oil his filter at each stop without having to pack a half-dozen pleated paper spares with him. That's the only advantage of being able to be cleaned then reused.

Prior to the usage of pleated paper around 1955 the old air "cleaners" had oil baths in which the incoming air was directed thru the oil. Logic would tell you all of the dirt got trapped by the oil but that isn't so as the air passed thru the oil in big bubbles. So they started using screens between the oil and the carb so the air would have to weave it's way thru but the air still contained bubbles (just smaller and a lot more of them). So the only logical solution was to use pleated paper (for more surface area) that contained millions upon millions of tiny holes of a given micron size (a micron measuring .00004").

People falsely assume K&N produces "better" or "more efficient" filters because of their use in off-road racing events and advertising hype but the fact is their filters don't even come close to providing as fine of filtration as the pleated paper provides.

Do any of you remember the "toilet paper" by-pass oil filters that were the rage in the late 60's? Because of their super-fine filtration they removed every single bit of the carbon particles produced by combustion. So efficient the oil wouldn't ever darken. But as they were so efficient they got completely plugged up within just a few hundred miles. So the filters used today are a trade-off between efficiency and life span.

And another thing. Although it's not recommended (by the manufacturers naturally) a pleated paper filter can easily be cleaned and reused by blowing them out with compressed air; the trick being to not damage them by using too high of air pressure combined with a small nozzle. And then replacing them after about 10 cleanings as the paper will eventually get damaged from the cleanings.
 
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