A "pre" air filter

Wardy · Jan 5, 2021

Evening gents, don't know if this is a good idea, or already been discussed, but last time I was on a big trip, when I cleaned my k&n filter it was full of crap. So I was thinking would it be a good idea to place a pre filter, sponge type, on top of the main filter to help it. Would this hinder the air flow, or would this be a good idea? Your thoughts please gents, and please be gentle :blast

. Cheers Steve.

dean0n0 · Jan 5, 2021

Unifilter do a pre-filter https://www.uniflow.com.au/contents/en-us/d365_BMWADV.html

nicholsonj2252 · Jan 5, 2021

Wardy said:
Evening gents, don't know if this is a good idea, or already been discussed, but last time I was on a big trip, when I cleaned my k&n filter it was full of crap. So I was thinking would it be a good idea to place a pre filter, sponge type, on top of the main filter to help it. Would this hinder the air flow, or would this be a good idea? Your thoughts please gents, and please be gentle. Cheers Steve.

Steve , I have a pre-filter on all of mine . One is a genuine Uni Filter , the rest I made myself from the black foam used for Aquarium filters

https://www.uniflow.com.au/contents/media/NU-7311.pdf

dean0n0 · Jan 5, 2021

nicholsonj2252 said:
Steve , I have a pre-filter on all of mine . One is a genuine Uni Filter , the rest I made myself from the black foam used for Aquarium filters

Reticulated foam, like this?....https://www.addfiltration.co.uk/reticulated-foam-sheets

nicholsonj2252 · Jan 5, 2021

dean0n0 said:
Reticulated foam, like this?....https://www.addfiltration.co.uk/reticulated-foam-sheets

This is what I used....

https://www.ebay.co.uk/itm/1-x-Air-...037498?hash=item2af43987fa:g:Bm4AAOSw1P1falT1

Wardy · Jan 5, 2021

Guy's that's brill, I've just dug out a g450 sponge filter and cut a rectangle to fit over top of k&n. Looks like this will work a treat, jobs a good un :beerjug:

Thanks for your quick responses gents, and have a nice evening.

dean0n0 · Jan 5, 2021

nicholsonj2252 said:
This is what I used....

https://www.ebay.co.uk/itm/1-x-Air-...037498?hash=item2af43987fa:g:Bm4AAOSw1P1falT1

More affordable.

Losttheplot · Jan 10, 2021

nicholsonj2252 said:
Steve , I have a pre-filter on all of mine . One is a genuine Uni Filter , the rest I made myself from the black foam used for Aquarium filters

https://www.uniflow.com.au/contents/media/NU-7311.pdf

Don't blame you. I had the Unifilter pre filter on my bike. Wasn't exactly impressed with the quality and fit. It didn't take long for the air box cover to rub a hole in the top of it..

Drumacoon Lad. · Jan 23, 2021

I've used a unifilter for 40k miles or so on an xCo. When I took it down to Gambia the 1st time, I added a course mesh filter on top. Checking the filter after crossing the Sahara, there was very little inside the filter and the airbox was clean. The bike seems to still breath well.

Sent from my SM-G970F using Tapatalk

theoneandonly · Jan 23, 2021

i use the GF's old tights on a k+n on my sportster , inside the housing.

A "pre" air filter

Wardy

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dean0n0

Well-known member

nicholsonj2252

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dean0n0

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nicholsonj2252

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Wardy

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dean0n0

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Losttheplot

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Drumacoon Lad.

Well-known member

theoneandonly

looking over the edge

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