Air filter tests

[pete-blen]

quite interesting..

take a note where K&N filters came in each test..

http://www.dieselbombers.com/chevrol...r-testing.html

[Night Falcon]

quite interesting..
take a note where K&N filters came in each test..

http://www.dieselbombers.com/chevrol...r-testing.html

just as well i'm not running the 690 on diesel with k&N filters

[Woodman]

Velly interesting, had already deciced to replace my k&n for the dusty season.

[Padmei]

Velly interesting, had already deciced to replace my k&n for the dusty season.

but how do you explaon the buildup & choking of dust during the rainbow ride?

[pete376403]

Do any common off road bikes use dry paper filters? Paper is fine when you have the space and a way of keeping water out. Oiled foam is probably the best compromise for an off road bike - just service it regularly.
In addition to the foam oil I also smear grease inside the airbox and on the filter where is seats against the air intake.

Incidentally,when i was doing my apprenticeship on Cat tractors about 40 years ago, the best air filters were the oil bath type, but dry paper (with a pre cleaner) were preferred because the oil bath ones were such shitty things to service.

[Motu]

There are much cheaper alternatives to a K&N....and they make a K&N look super efficient. I just love seeing an unoiled one of those on a Honda Civic...not only are they losing power, but killing the engine too.

[Woodman]

but how do you explaon the buildup & choking of dust during the rainbow ride?

Doesn't stack up really, the K&N has the worst ability to capture dirt, but clogs up at the second fastest rate and lets the second most amount of dirt through. Not a very good combination really. I thought the fact that mine clogs up to the point of shutting down the engine meant it was doing its job really well. Now not so sure.

[Box'a'bits]

Myself, I still prefer my oiled foam. Easy to service. Easy to see how clogged (or not) it is. I was surprised when I got the one on Gus how much dirt was getting trapped. It wasn't obvious on the dry paper ones

The Aussie guys in the ADVrider forum were saying that paper was best. Paper can be washed (I'm guessing this is a specialty thing that the transport industry uses, especially in Aus). They suggested dropping some water into a paper filter to see whether it turned to paper machie like it is reputed to (it doesn't).

I knew about the K&Ns. I have one in my R100RS, but have been meaning to replace it for a while. It's a round one. The bike used to spit oil thru the breather, & paper filters do not react well to that.

[Eddieb]

I've just got a new foam filter from Procycle for the DR, among other goodies. This one is branded DT-1 and is a triple layer foam filter. It will be interesting to see how it goes as I've not seen a triple layer filter before.

Also on the DR I've currently got the airbox out for some other work. I removed the airbox snorkel a while ago but none of the rest of the airbox has been opened up, the filter directly underneath the airbox inlet hole is blacker than a black thing, but the rest of the filter is quite clean. I also use the 'grease around the base of the filter' method, it makes things a bit messy when changing filters but I wasn't confident it was sealing all the way around.

I was going to open the airbox further but I might have to make some sort of flap that directs the flow away from the filter like the stock snorkel did.

[pete-blen]

My XT has the dual stage DNA filters in it "like K&N"
with the DNA the side of the airbox is replaced with a filter
along with the standard paper filter... Think I will get a form
filter for the inside and put the standard side back on the airbox.

[Night Falcon]

I was close to pulling the trigger on a K&N for the 690 but went with a foam unifilter in the finish. Glad I did now

[Padmei]

I was close to pulling the trigger on a K&N for the 690 but went with a foam unifilter in the finish. Glad I did now

uhoh- you didn't buy one of those unifilters did you

[Night Falcon]

uhoh- you didn't buy one of those unifilters did you

it was the salesman offer of a free ginzu 2000 knife (cut through a shoe) that really clinched the deal

[pete376403]

The Aussie guys in the ADVrider forum were saying that paper was best. Paper can be washed (I'm guessing this is a specialty thing that the transport industry uses, especially in Aus). They suggested dropping some water into a paper filter to see whether it turned to paper machie like it is reputed to (it doesn't). .

What I was told (apprenticeship again) was that the paper fibres absorb water and swell up, blocking the micro-holes that the air normally passes through. I guess once the filter dries out the paper returns to its previous state

[mossy1200]

Charts and diagrams are all very nice but if your bike cant sukky hard enough the last 10% of airflow through the filter wont change performance much.
What was interesting was the dirt passed through the filters.