When de-catting the bike and using Remus headers does anyone use a sports air filter ie; k&n or do you run standard? Looking to get it mapped but not sure on filter? TA
airfilter?
- Thread starter 47Steve
- Start date
standard filter every time k and n waste of money
Fitted a K&N to complement my decat'd headers and Remus can, it's only noticeable at the higher end of the rev range, 6k and above, but it is noticeable (in my humble opinion of course)
Bendy toy
Registered user
I have a Piper Cross oiled foam filter. The same type (oiled foam) worked well on a Honda 125 that did 65K miles with no appreciable bore wear. But in terms of cost/benefit I think the OEM filter is more than good enough. For better air flow chop off the inlet stub pipe but it will be noisy.
kyrano
Registered user
K&N for me 
OE is more than good enough with regards to air-flow, IMO, & filters well.
I have seen many claims of "improved performance" from fitting a K & N or similar, but I have yet to see a validation of this by "before & after" dyno runs.
I'm always prepared to be enlightened.
As I said, I only noticed the difference when pushing on hard, from 6k to the red line.
But is that actual BHP, or just an impression reinforced by the change in intake noise level ?
I don't know the answer; as I said, I wait to see evidence.
I doubt it's BHP, it just breaths better when maximum levels of induction are required.
Wrong...
Right.
K&N filters are American snake oil on anything other than a NASCAR engine where they are designed to filter out tumble weeds.
OEM every time.
Alan R
IMHO this depends on the bike and the air box, some bikes do benefit from air box mods: I had a K&N in a Firestorm and it did give a bit more power, when combined with a dynojet kit, my LC250 was definitely strangled by the standard air box and my VFR and KTM supermoto also benefitted from airborne mods. Opinion seems to be that the GS air box and filter is quite well designed and there's little benefit from fitting a K&N.
BOBAD
Registered user
Is right.
Fitting a K&N filter is just God's way of telling you that you have too much money to spend.
There are numerous ways to improve a standard GS; seats, horn, lighting etc. but changing the standard air filter is not one of them.
I don't understand this sentence. If it's "breathing better" in what way does that manifest itself, if not BHP ?
And at what point does the OE set-up fail to pass enough air ? I should add that I personally doubt that the OE is inadequate at any throttle opening.
why not, I fitted a pipercross on mine at 6,000 miles, I've not had to buy another air filter since, now just under 60,000 miles. It must be cost effective if you do high miles
Bendy toy
Registered user
K&N filters are very thin fabric oiled with a sticky oil that's supposed to grab the dirt. But being so thin fine particles will get through. Even K&N themselves admit their filters clean the air better when they are dirty.
Pipercross is an oiled foam element that forces air to change direction allowing the dirt to be trapped. It might flow more freely than OEM but it's there for life and easy to clean. Just don't forget to re oil it. K&N does flow more freely but at cost of not taking out the the fine dirt. So why would anyone want one for anything other than a race engine?
Pipercross is an oiled foam element that forces air to change direction allowing the dirt to be trapped. It might flow more freely than OEM but it's there for life and easy to clean. Just don't forget to re oil it. K&N does flow more freely but at cost of not taking out the the fine dirt. So why would anyone want one for anything other than a race engine?
I'm going to bow to superior technical understanding and withdraw from the discussion.
I like the K&N snake oil and am going to keep it.
I like the K&N snake oil and am going to keep it.
Bendy toy
Registered user
It doesn't take any expertise to see that a single layer of thin cotton cloth isn't going to stop much fine dirt.
JimVonBaden
Registered user
The factory filter flows far more air than needed. Unless you are doing radical mods to the engine, you gain nothing but extra dirt in the engine with a K&N. I can't say for the Omni or other non-OEM filters.
Jim
Jim
Bendy toy
Registered user
Doubling a tube diameter increases flow by 16x. Now compare throttle body intakes diameter with the air filter intake spout.
Case rested. It's nothing to do with the filter.
Case rested. It's nothing to do with the filter.
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