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Old 05-06-2010, 10:07 AM   #1
hillbillypolack OP
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Blue air filter / paper filter / K&N, any opinions?

I've usually used K&N air filters in my bikes, but haven't yet made any changes to the GS. I also know the air filter change often goes hand-in-hand with an exhaust mod, so perhaps this question is best fielded to that crowd. .

I see some options, including Wunderlich's 'Blue Filter', listing for about $90. Ouch. The equivalent K&N is half that.

Thoughts on air filter options? What works, what have you tried?
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Old 05-06-2010, 10:42 AM   #2
TBob
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Uni - K&N will let dirt in(period!)
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Old 05-06-2010, 10:50 AM   #3
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Yepper, a foam is the only way to go. All the aftermarket filters are going to be higher maintenance (like 3k mile interval unless you use the pre-filter for the snorkel) but you get much better filtration and re-useable, water doesn't distort or damage them either. Retail on the Uni Australia with pre-filter kit is $63.80 which makes it the best choice for my money!
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Old 05-06-2010, 11:07 AM   #4
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Quote:
Originally Posted by hillbillypolack
I've usually used K&N air filters in my bikes, but haven't yet made any changes to the GS. I also know the air filter change often goes hand-in-hand with an exhaust mod, so perhaps this question is best fielded to that crowd. .

I see some options, including Wunderlich's 'Blue Filter', listing for about $90. Ouch. The equivalent K&N is half that.

Thoughts on air filter options? What works, what have you tried?
Check this out for what it's worth !!!

http://www.duramax-diesel.com/spicer/index.htm
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Old 05-06-2010, 02:59 PM   #5
jetmech1990
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K&N work great if you oil them correctly....have them on my cars, quads, rhino..intake tracts are spotless...
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Old 05-06-2010, 07:38 PM   #6
RED CAT
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K&n!

Crap. Foam from BMW of Atlanta is the only way to go on a GS.
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Old 05-07-2010, 06:54 AM   #7
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Quote:
Originally Posted by jetmech1990
K&N work great if you oil them correctly....have them on my cars, quads, rhino..intake tracts are spotless...
But,....oiling them correctly means killing any CFM gains they advertise from a "flows better the dirtier it gets" campaign

I've had a few K&N's in my life time. After running around in high horsepower Supra's and powerstroke's I learned the benefits of a good foam filter. Cotton gauze is crap, specially if there's dirt involved. When's the last time you saw a current day dirt bike come with a paper or cotton gauze filter?
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Old 05-07-2010, 07:39 AM   #8
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what part of the country are you from?
I live in AZ and have never once seen a clean intake from an off road vehicle running a K&N and yes they were oiled correctly. Do you just look at the intake or have you actually run you finger down it?

Quote:
Originally Posted by jetmech1990
K&N work great if you oil them correctly....have them on my cars, quads, rhino..intake tracts are spotless...
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Old 05-07-2010, 03:15 PM   #9
Kiwirich
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Wicked It's actually really easy

Go for the foam with a pre filter on the snorkel & never worry again

There may well be a gain with K & N but the real question is how often do you want to rebuild the engine ??????

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Old 05-08-2010, 12:24 PM   #10
jetmech1990
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Well have 100K on my powerstroke, 2000 miles on my rhino, and my quad is an 03 with alot of seasons under its belt and haven't even done a top end due to "scoring" yet. The only thing in my intake for my excursion was oil from my crank case vent, I did replace the turbo...because I wanted more boost, not due to a failure... and the impeller looked great and not "eroded". I haven't seen a dirt bike with a cotton gauze filter in the stock air box(probably due to its shape)...ran a UNI on my CR worked good. I'll keep you posted when I rebuild my boxer because I have a K&N on it....hope your all around long enough to see that post...you'll be waiting a while...now I'm worried about my sea-doo's...they don't have filters at all...might blow up soon due to volcanic ash over the water...

The prefilter is a good idea...I believe in outerwears

and I said oiling correctly..not OVER oiling...do you not oil a foam? I'm sure the sticky filter oil increases CFM on a foam also

or you can always just stay out front and let the "foam" guys filter the air behind you

BTW I'm from SoCal...we have dirt here too

And BMW Atlanta your quote "flows better the dirtier it gets" haven't seen K&N make that claim...but I have seen it in True Flow FOAM filter ads...mmmmm, how does that work?? maybe you miss quoted...but hell if thats the case I'm switching everything to foam and never cleaning a filter again...

http://www.ibmwr.org/otech/airfilter.html Good link...this debate has been around a long time

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Old 05-08-2010, 03:31 PM   #11
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What I do know is that the Unifilter Australia filter oiled properly for an R1200 will out flow a dry K&N, Blue Filter or OEM by over 50 cfm on a flow bench.

I also know a little company called HPN that will not run any cotton gauze product on their boxers after prematurely loosing compression in a few dakar bikes during testing (not one, but every single bike they ran equipped with a cotton gauze filter)
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Old 05-08-2010, 10:43 PM   #12
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key words...flow bench, dry, dakar...as you can see by my user name....I work in a industry where you can't pull over to the side of the road...so MY and OTHERS lifes depends on it...and everything i maintain will not leave me stranded...EVER...ANYWHERE....20+ years in the industry...and any number can be relpicated on a "flow bench" so that data can read what ever you want it to read...second you say "dry" K&N..they aren't supposed to be ran dry...duh...and third..we are riding a fucking GS...not a dakar rally bike...where money doesn't matter and sponsers pay the billls...apples and oranges...but then again...I don't sell parts or services

Secondly you "quote CFM increase by 50 CFM on a flow bench"...i'm not a BMW dealer...can a stock BMW 1200 handle an increase of 50 CFM?...stock? how about just a slip on?...full exhaust....head work...bored throttle bodies....? if it can't how do you benefit from more CFM?...these are "flow bench" and "sales" numbers...not useable numbers...unless you have a highly modded motor...there is going to be a cork in the system.

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Old 05-09-2010, 09:26 AM   #13
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Quote:
Originally Posted by jetmech1990
key words...flow bench, dry, dakar...as you can see by my user name....I work in a industry where you can't pull over to the side of the road...so MY and OTHERS lifes depends on it.
You also work in an industry that has nothing to do with AIR FILTERS, go ahead tell me all about it, I know a few things about jets myself.
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Old 05-09-2010, 09:41 AM   #14
ricohman
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K&N will let dirt in. I won't use this crap on my FJ40 ever again. Paper filter and foam. And I'm not the only off roader to figure this out.
However, K&N is ok if you stay on the street.
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Old 05-11-2010, 06:41 PM   #15
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Where's trusty Jim V on this topic?

u dare, JVB?
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