RE: whats the people think about k&n filters?
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RE: whats the people think about k&n filters? - 2/24/2007 2:04:53 AM
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R1000
Posts: 1129
Joined: 1/30/2006
From: Sweden
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I had a K/N filter on my -92, which pulled far stronger than many sport bikers expected, and provided tons of fun. I never used a stock air filter so I cant tell if the filter in itself made any difference, but it worked well after some carb tweaking together with a 4-2-1 exhaust. The K/N filters are debated though, and my feeling is that a stock filter normally is a better choice. The reason is they filter more effectively and if one is not looking for the very last horsepower at redline, they should also work better than K/N if everything else is left stock as mentioned in a post above.
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RE: whats the people think about k&n filters? - 2/24/2007 5:18:48 AM
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bonnetboy
Posts: 24
Joined: 2/11/2007
From: Far South Coast, NSW, Australia
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I got k&n filters on mine but couldnt tell you how much difference they made as I only recently got the bike & the k&n filters were already fitted. Dont know if the carbs were rejetted to suit them. Is this a neccessary thing to do when getting aftermarket filters.
Dan
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RE: whats the people think about k&n filters? - 2/28/2007 5:25:40 PM
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WhiteHawk
Posts: 92
Joined: 12/22/2006
From: Michigan, USA
Status: offline
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K&N has poisoned your mind. Follow this link to a K&N study
http://www.paintballtipps.com/kntest.htm
My friend told me a story about when is dad was racing at the drags, they tried with paper air filter, holes punched in the air filter, then no air filter. There was no change in performance.
Automotive Powertrain Engineers don't use the air filters to restrict horsepower output.
The seat of your pants is not a dynamometer.
< Message edited by WhiteHawk -- 2/28/2007 5:27:10 PM >
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RE: whats the people think about k&n filters? - 3/1/2007 5:12:16 AM
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mikekop
Posts: 243
Joined: 4/10/2006
From: Sweden
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Oacuna: Wait a minute... Are you actually giving CBRChris free gas?  yeah, just rub it in, do you know how much we here in Sweden pay for gas? 5.88/gallon!!! 
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I´m not dangerous, I´m just plain ugly!
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RE: whats the people think about k&n filters? - 3/1/2007 8:29:07 AM
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forx
Posts: 109
Joined: 1/26/2007
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@mark :MY FUEL GUAGE IS POINTLESS,SHOWS EMPTY WHEN IM AT HALF A TANK..DOH
srry caps!!
< Message edited by forx -- 3/1/2007 8:30:34 AM >
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RE: whats the people think about k&n filters? - 3/1/2007 4:08:49 PM
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CBR1988
Posts: 198
Joined: 10/25/2005
From: Hants UK, NY USA, NC USA, UAE now
Status: offline
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Hey:
Cbrchris from what I have been able to evaluate on K&N filters is that they have 1 main advantage over paper filters
and that is they are reuseable. The single direct replacement made no difference in performnce on my cbr drag bike.
I went to individual K&N pods and they did require a good bit of carb fiddling with jets and settings to get it right
they also moved my powerband up a bunch towards the top end and did show improvement on ET/MPH but also
made the bike not as much fun to street ride, as I lost alot of low to mid grunt with a tradeoff of a big top end rush.
Most bikes at the strip do not even use filters, but I'm on a racers budget so I need to keep the engine free of dirt
at the expense of all out power.
So don't be taken in, on all the after market claims other wise with a few mods you would have a 276% increase and
we all know it does not work that way.
K&N filters have a long life time and purchased at the right price, will give you long years of use, if you plan on
keeping the bike. This is only approximations, Figure how many paper cleaners will be diposed of, times the price,
(change out the paper cleaner 2 times a year, for 4 years(how long bike is kept)= 8 paper filters at 15.00 ea. =$120.00
vs K&N at $50.00 plus a soft brush $2.50, Detergent soap $2.50 a bottle good for 1 yr, and K&N filer oil $10.00 for a yr
plus the cost of water to clean it. (A premium in the UAE but K&Ns seem to keep the sand out better)
= and initial investment of approx $65.00 with $45.00 over the next 3 yrs if the brush wears out after a year,
for a total of $110 for K&N vs $120 paper disposable, get the filters cheaper and the advantage goes in that direction.
Get rid of the bike sooner and the paper filters win.
I hope this helps, good luck on your choice
Dub
< Message edited by CBR1988 -- 3/1/2007 11:44:16 PM >
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When In Doubt Do Without
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RE: whats the people think about k&n filters? - 3/1/2007 5:57:41 PM
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Trips
Posts: 801
Joined: 3/31/2005
From: Perth (Western Australia)
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quote:
ORIGINAL: forx
@mark :MY FUEL GUAGE IS POINTLESS,SHOWS EMPTY WHEN IM AT HALF A TANK..DOH
srry caps!!
Mine had that as well. The clearance between the fuel gage sender flat and the internal fuel filter is quite small. I fixed it by giving it a slight bend towards the centre of the tank,
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Remember the light at the end of the tunnel may be an oncoming train!
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RE: whats the people think about k&n filters? - 3/2/2007 6:02:31 AM
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Ferlev
Posts: 28
Joined: 2/17/2007
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I just bought a new stock filter, should I oil it?? Thought it was only on offroaders you did this..?
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RE: whats the people think about k&n filters? - 3/2/2007 8:53:12 AM
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gorilla_biker
Posts: 131
Joined: 5/18/2006
From: Kent, UK
Status: offline
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hi ferlev,
no, you do not oil stock filters. It's the K&N filters from earlier in the thread that get cleaned and oiled.
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1995 CBR1000FS - Streetfighter
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RE: whats the people think about k&n filters? - 3/5/2007 1:46:58 PM
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WhiteHawk
Posts: 92
Joined: 12/22/2006
From: Michigan, USA
Status: offline
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I just recently had a discussion with a GM powertrain engineer. My question to him was, when you are designing the engine, do you use the Air Filter to determine HP output, then I regarded it to K&N and my theory that the K&N does not increase valve lift and intake runner size. He stated that during engineering, the Air Filter should not restrict any air flow, the only way it becomes restrictive is when it is dirty.
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RE: whats the people think about k&n filters? - 3/5/2007 1:47:52 PM
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WhiteHawk
Posts: 92
Joined: 12/22/2006
From: Michigan, USA
Status: offline
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quote:
ORIGINAL: Ferlev
I just bought a new stock filter, should I oil it?? Thought it was only on offroaders you did this..?
NOOOOOOOOOOO!
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RE: whats the people think about k&n filters? - 3/6/2007 2:57:13 AM
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gorilla_biker
Posts: 131
Joined: 5/18/2006
From: Kent, UK
Status: offline
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quote:
He stated that during engineering, the Air Filter should not restrict any air flow
All due respect to the GM Engineer, but this is not strictly correct. Vacuum carbs rely on a pressure differential to lift the slides and the air filter is a fundamental element in the equation. Mechanical (slide) carbs are a different proposition. There are countless stories of poor running bikes where pod filters (or no filters) have been fitted to bikes with vacuum carbs.
_____________________________
1995 CBR1000FS - Streetfighter
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RE: whats the people think about k&n filters? - 3/6/2007 9:37:46 AM
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WhiteHawk
Posts: 92
Joined: 12/22/2006
From: Michigan, USA
Status: offline
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quote:
ORIGINAL: gorilla_biker
quote:
He stated that during engineering, the Air Filter should not restrict any air flow
All due respect to the GM Engineer, but this is not strictly correct. Vacuum carbs rely on a pressure differential to lift the slides and the air filter is a fundamental element in the equation. Mechanical (slide) carbs are a different proposition. There are countless stories of poor running bikes where pod filters (or no filters) have been fitted to bikes with vacuum carbs.
I don't want to make the engineer seem like an idiot because he is not, but I was talking to him about stock autos (i'm sure he assumed FI), and he was being very careful about what he said.
About the carbs, could there have been a bottle neck in the air box? Personally I think it is incorrect to use a filter to effect air flow for proper running, what about when it gets slightly dirty or really dirty...this is just my theorizing, so who knows if i'm correct, eh :)
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RE: whats the people think about k&n filters? - 3/6/2007 8:35:34 PM
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HeavyCBR
Posts: 108
Joined: 4/22/2006
Status: offline
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I just went from a stock type filter, which was BLACK and had not been changed in at least 20k miles, to a K&N filter. The only SLIGHT difference that I noticed was the engine was more free reving....but this will occur anytime you clean your filter. I would say that even the butt-dyno can't feel a difference.
Reason I got the filter was it's reusable.
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1996 CBR1000F
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RE: whats the people think about k&n filters? - 3/7/2007 11:29:06 AM
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WhiteHawk
Posts: 92
Joined: 12/22/2006
From: Michigan, USA
Status: offline
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Yeah, the only reason I purchased the motorcycle was because the owner mentioned "K&N", I jumped all over the bike.
That was sarcasm.
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