OZ ATV :: The Australian ATV Forum

[doorslammer]

hey all

wich filter is better, foam or the K&N style ones
i have heard that the K&N are better in the sand and the foams are beeter for dust
also do you oil the K&N filters?

thanks
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01 Banshee
Never take life seriously. Nobody gets out alive anyway

[TUFF AS]

k&n are the best for eveything and yes you need to keep them oiled!
p.s make sure if your running no lid with k&n filter run a outerwears cover over the filter

cheers brad,
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07 BANSHEE 91hp atw at the moment
04 WR450F still yet to know hp

[OZ_450]

in mx dusty enviroments i would go foam over a k & n any day as do 90% of mxers in australia and usa
_________________
black covered in 5.7 powered oversize quad
model vx ss 350 hahaha
enough bass to compensate for lack of skills
Empty Wallet Racing proudly on track for GM Motorsport

[Quad]

i dont oil a k&n filter ,had no problems

[OZ_450]

you serious quad?

grab some spray on filter oil and start oiling it quad ya will be glad ya did

you are not going to race with a unoiled filter in mx are you ?
_________________
black covered in 5.7 powered oversize quad
model vx ss 350 hahaha
enough bass to compensate for lack of skills
Empty Wallet Racing proudly on track for GM Motorsport

[4stroker]

quad wrote:

i dont oil a k&n filter ,had no problems

its probably not such a big issue when racing motard, but it would be anywhere else!
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2002 SE Banshee

[Hudson]

Most good engine builders I know and have spoken to won't build you an engine unless you DO NOT run a K&N. I think a lot of advertising and sponsership over the years have given most peolpe the wrong idea of what a good filter is.

Not my words but that of some of the most respected engine builders I have spoken to and not just in motorcycle engines.

If you want the best air filter in the market I would ask the best engine builders in the market!!!

[doorslammer]

yes im not a big fan of the K&Ns but was curious to what people who run them think of them and how long they last, how much crap they let through..
_________________
01 Banshee
Never take life seriously. Nobody gets out alive anyway

[bullet]

The best filter you can get will most likely be one of the more restrictive ones.
Alternatively, the most horsepower might come from one of the worst filters.

It's a bit like the tyre life vs grip argument.

Add oil = add restriction but increase filter performance.

You can basically choose a micron rating that suits the engine performance vs engine life that you are looking for. A an oiled coarse foam filter might offer the exact same filtering and flow as a tighter woven dry filter.

Top quality filter material run dry can be a really good option.

I run my 'Fuel Customs' intake filter dry and I can not even wipe the slightest dusty discolouration out of the intake belmouth.
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Can-Am X Team
Bullet #Y12. MrsB #Y18.

[Quad]

ding ding thats right ,i wont the filter to work and breath .

[4stroker]

Hudson wrote:

Most good engine builders I know and have spoken to won't build you an engine unless you DO NOT run a K&N. I think a lot of advertising and sponsership over the years have given most peolpe the wrong idea of what a good filter is. Not my words but that of some of the most respected engine builders I have spoken to and not just in motorcycle engines. If you want the best air filter in the market I would ask the best engine builders in the market!!!

every 800hp + sprintcar ive seen has run a K&N!
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2002 SE Banshee

[priesty]

Has anyone tried the motoworks dry filter ? Would like to get opinion of someone who runs one.
_________________
The term "Foolproof" seriously underestimates the ingenuity of Fools.


08 700xx

[bullet]

quad wrote:

ding ding thats right ,i wont the filter to work and breath .

Yeah me too.
And chuck some of those super sticky tyres in that never wear out on my tab as well.
_________________
Can-Am X Team
Bullet #Y12. MrsB #Y18.

[4stroker]

lol sounds like a tim tams ad!
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2002 SE Banshee

[OZ_450]

4stroker wrote:

Hudson wrote: Most good engine builders I know and have spoken to won't build you an engine unless you DO NOT run a K&N. I think a lot of advertising and sponsership over the years have given most peolpe the wrong idea of what a good filter is. Not my words but that of some of the most respected engine builders I have spoken to and not just in motorcycle engines. If you want the best air filter in the market I would ask the best engine builders in the market!!! every 800hp + sprintcar ive seen has run a K&N!

yooooo and not to open a can of worms but why is that ???

as most speedway tracks run wet and sticky ........ not dusty also most tracks that dust off are a SAND based track so bigger particles then dust

hence the k and n's on sprint cars they also run a foam filter in the bonnet scoops that are oiled with a light oil also just for some trivia ...... as Brooke forgot to lock his in at warrny and it conctricted airflow to his filters lol
_________________
black covered in 5.7 powered oversize quad
model vx ss 350 hahaha
enough bass to compensate for lack of skills
Empty Wallet Racing proudly on track for GM Motorsport

[Hudson]

OZ_450 wrote:

4stroker wrote: Hudson wrote: Most good engine builders I know and have spoken to won't build you an engine unless you DO NOT run a K&N. I think a lot of advertising and sponsership over the years have given most peolpe the wrong idea of what a good filter is. Not my words but that of some of the most respected engine builders I have spoken to and not just in motorcycle engines. If you want the best air filter in the market I would ask the best engine builders in the market!!! every 800hp + sprintcar ive seen has run a K&N! yooooo and not to open a can of worms but why is that ??? as most speedway tracks run wet and sticky ........ not dusty also most tracks that dust off are a SAND based track so bigger particles then dust hence the k and n's on sprint cars they also run a foam filter in the bonnet scoops that are oiled with a light oil also just for some trivia ...... as Brooke forgot to lock his in at warrny and it conctricted airflow to his filters lol

Huuuuuuuuuuge can of worms.

Worked on them for years been all over Australia with WSS champ and even to the states to work on them.

The cars I have worked on all have used a "Finer Filter" sock over the K&N that is oiled and cleaned after every meet. Also these engine are rebuilt every 12-15 shows and if you add up the actual run time on these things (10 odd minutes a night), they can afford to run a higher flowing air filter to make HP and sacrifice a bit of dust remembering they only run 2 hours before a rebuild.

[bullet]

That makes perfect sense to me Hudson.
_________________
Can-Am X Team
Bullet #Y12. MrsB #Y18.

[triple"A"]

so in a nutshell it depends on who you are, where you are , why you are, and when you are
different environments require different levels of filtration capability (if there is an air filter fitted to an outboard engine, it's usually a very coarse one)
different people have different maintenance regimes
different machines and riders require different outcomes from the product
and even different atmospheric conditions play a role
so it's really a case of working out what's best for your machine under your control, in the elements you operate in.

oh by the way, i've dusted engines using both types of filter, and now run an oiled foam filter, for the purpose of reducing overhaul costs, but admit there is some hp sacrifice to achieve this. (i have also had engines dusted due to my slackness in maintenance too)

[4stroker]

i remember in an ADB magazine article years ago they raced the Finke on an XR400 with NO AIR FILTER! and it made it...

so there ya go you dont even need em!
_________________
2002 SE Banshee

[doorslammer]

poor xr 400

wonder how much trailing he did behind other bikes in the dust?

might take mine off for maximum power
_________________
01 Banshee
Never take life seriously. Nobody gets out alive anyway

[Quad Squad]

4stroker wrote:

i remember in an ADB magazine article years ago they raced the Finke on an XR400 with NO AIR FILTER! and it made it... so there ya go you dont even need em!

I remember that article....wasnt it the editor or someone from that mag that forgot to put the filter in?

Having said that, its going to take alot more than a bit of dust to kill an XR400. Ours has taken a beating for years on the original motor and still comes back for more.
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