You oil a K&N also. A K&N will pass dirt in a dusty condition it is proven! In desert racing everyone uses a Foam type filter. Check the CT website

 

yes i know the k/n uses oil but the uni oil is not in spray form and sure is a messy deal compaired to the k/n spray. i have not been in extreme desert dust to see the difference in the foam vs paper? i just don't like the mess or the dirt that collects on filter because of the oil. my 2 cents.

 

Another $ .02, if wee add it all up can we buy more beer?

Any way, I've been running K&N on my sand rail for 10 years now, no loss in compression and the performance is perfect. My DS has been on K&N since day one, no problems at all. My 460ci with a K&N and 135,000 miles, no problems. My 7.3 L powerstroke is on K&N and haven't had any problems.

My ex-future wife's 400ex with a uni ran good for the first 2 days, then I had to clean the uni, it was starving for air and caused a rich mix.

One more sample... My old man has run K&N on his rail for over 20 years. He just re-built the engine (it was tired) for the first time. He bought jugs, pistons and rings. After we got it apart all we needed were rings. Very clean and no odd scratches on the cylinder.

Most of us will do some repairs or mods to our engines long befor any FOD that may get thru the filter does any damage.

this make $.26 worth. 100 more and we can but 1 beer. lol

 

"Most of us will do some repairs or mods to our engines long befor any FOD that may get thru the filter does any damage."






Your 7.3PSD could easily be harmed by FOD before you ever needed to tear it down for any other reason.

Thanks for your experiance, thats the kind of stuff we need, i would assume you run outerwears on your filters?
I Ran a K&N on my V10 F250 for two weeks in the TX desert and when i removed it the intake tube was lined in a thin layer of dust, that day i pulled the K&N off my truck and DS, and gave them away to forum members for free, i will never run them again, i was not running the outerwear on my V10, ive heard it stated before that once you run the outterwear you decrease flow almost to the point of a foam filter.

If your dad's rail was that clean thats a testamont to the K&N working but maybe it was run in Sand all its life, and never ran a desert race type event, spending hours in the fine dust of others before your..... thats the type of situation that i wouldnt touch a K&N

Jetjock16

 

You may be correct JET, anything could do harm.

All of my vehicles and my old mans get run hard and everything from sand, desert and the cinders. There isn't anything as fine as the dust at the cinders in Flag.

I have looked at the snokle on my DS and the intake on my 7.3 psd, ther is no dust. I even sprayed some light oil in the snorkle on my DS prior to going to the cinders to see if anything got thru. Nada. As for the 7.3 PSD I will spray some oil in the intake tube to see if any dust is getting in.

There is a dust storm going on here now, so I will do it befor I go home.

I do run outerwears on all but the PSD. I think a K&N with outerwear still flows better than a foam on the DS.

Thanks for the info, I appreciate it.

 

jets got this one by the horns...I ditto exactly what he said...I'd put one on my street vehical because it does offer great performance...but performance is also measured in reliability and off-road you need the love of the foam...

Hate cleaning your foam filter try the no-toil filter cleaner/oil...its biodegradable also(take that tree huggers)

 

You guys are awesome . I didn't mean to start a war though. Lots of good advice and I appreciate it . I'll let you know what wins. Thanks

 

I'll give you a suggestion that no one else has: try getting the best of both worlds (it does cost more though.) Get a K&N, then get the Uni filter which is designed to fit on the outside of a K&N for a TRX250R. (The TRX250R filter is almost exactly the same size as the DSs.) Now spray the inside of the Uni filter with oil & leave the outside of it dry. This affords you a good amount of protection - all of the air is passing through the Uni and through some amount of oiled area on the Uni, then it passes through the K&N to pick up anything the Uni could have left behind. Keeping the outside of the Uni oil free means it doesn't cake up very quickly, reducing the amount of work you have to do.

I used to have a regular 'outerwears' on my K&N however I've grown to loathe those things - they cake up fast & get tears very quickly. Once you get a tear in the outerwear, it's pretty much ready for the round file, then you have to spend another $10 to replace it.

 

I've used both, a lot.
In my opinion, neither is harder to maintain than the other - you pull the spring out of the Uni, and then you can squeeze and ring it. They both take oil, which is what catches the dirt as mentioned, and both oils can be bought in a spray. After oiling a K&N you have to let it sit standing up on a rag for 24 hours for any excess to drip off so you don't make a mess on your bike, but the Uni can just be squeezed and blotted.
No doubt the foam will filter finer than a pleated gauze.
I ride at the Badlands, IN every month for the past several years. Its the dustiest environment there is - equally as dusty as any western desert. Its almost unbarable to follow another quad in the summer due to the horrible dust, and you gotta clean the filter just about every ride.
I use K&N w/ outerwear on my DS, and there is never any traces of dust in the intake tube. I recently did some internal mods, and everything inside was like brand new after 120 hours of K&N usage - the cylinder wall even had all its factory original spiral honing marks.
The Outerwear does not change my jetting/flow/power at all, there is no significant restriction.
I think some people are too sparing with their filter oil - on K&N and Uni both. Go ahead and put too much on - it can't hurt anything - and just let it sit overnight for the excess to run onto a rag. There is no such thing as too much oil, but not enough is disasterous.

 

If you have a TM45 carb the K&N will fit but, the Uni filter has too much material where it mounts up to the carb and doesn't allow you to throttle the carb.

It has been a while since I played with one but, I think it could even allow the carb to get in the stuck open position. I am not that good of a rider where I could take on my bike with the throttle stuck open.