Notice: We request that you don't just set up a new account at this time if you are a previous user. If you used to be one of our moderators, please feel free to reach out to Chris via the facebook Outerlimits4x4 group and he will get you set back up with access should he need you.
Recovery:If you cannot access your old email address and don't remember your password, please click here to log a change of email address so you can do a password reset.
This is just a warning to people using oiled sponge filters and cotton filters.
I drove in convoy the other weekend, kms of very very dusty driving. Dusty enough to be coughing up brown phlegm.
I still stand by the fact that as a trade off of performance and filtering a good well oiled uni filter does very well. But it misses the very small particulates.
All there 4wd filters have 2 layers of foam as they are different grade foam. I have run Uni filters for 6 years on my patrol with both filter layers and NEVER had dust past the filter.
Get the 2nd filter on it!!!
GU 42td wagon for touring
GU ute for the fun stuff
http://www.allterrain4wd.org.au/
We've had some EXTREMELY knowledgeable people on this forum look at foam filters and it makes very interesting reading.
From a technical point of view I'd summarize it as "not a good idea" on their own.
I run an oiled foam precleaner in the snorkel head AND a quality paper filter in the airbox and IMO that's a good combination for clean air.
The oiled foam picks up an amazing quantity of crap with the paper doing the final cleanup ( and lasting many many times longer in the process ).
If your away for a few days then washing / changing the precleaners is very effective and easy.
Yes it does add more intake restriction........ but IMO you have to trade that off agaist the effects of a blocked or ineffective main filter.
( usual disclaimers )
It seemed like a much better idea when I started it than it does now.
turbo gu wrote:All there 4wd filters have 2 layers of foam as they are different grade foam. I have run Uni filters for 6 years on my patrol with both filter layers and NEVER had dust past the filter.
Get the 2nd filter on it!!!
Hi all...I,ll 2nd that.You should have 2 different grade foams for your filter,One fine the other coarse.You should allways use grease where the foam meets metal plastic ect or anywhere where you think dust can get thru.
Dirt bikes have used foam filters since the dawn of time and its common practice to use grease where the foam contacts other surfaces.
Never have i seen dust get past a correctly fitted foam filter.
I was always told by people to just use the paper throw away filters but when my local shop sold out of filters that day and i needed one he sold me a uni kit for my 80 series for 50 bucks. It came with two outers to change over and every 5000kms the core and cleaning shit. I noticed a difference straight away when driving around and could hear more air sucking into the snorkel. When i go away i'll fit the pre cleaner to the snorkel and keep cleaning that regularly. That said my mate had a navara with one and we did 50kms of dusty driving and his caked up with a thick layer of dust which was like mud where the air was going in. Dunno if he over oiled it or because he modded his air box or not. Another mate just got back from cape using a k&n so i've gotta check out how he went with his.
There are plenty of test reviews on the web that show paper gives the best filtration over foam.
Foam flows better because the holes are bigger. THe oil does not compensate fully for that.
Googel will prove that out.
Autospeed did flow tests and showed that paper air filters made up 10% or less of total intake restriction with the 90% being corrugated pipes and poor (non bellmouth) transitions from airboxes etc.
Of course it does not go into the oil filter pre filter with paper filter main scenario described by MIghtyMouse.
IMO oil filters are only needed if there is an expectation that the filter will get wet. (hence why they showed up on bikes first). Paper filters clog faster n' hell when wet. Not saying this is gosple truth just what I've always understood to be the case.
Give a man a fire and he's warm for the day, but set fire to him and he's warm for the rest of his life
'02 NM GLS 3.2DID ARB bar Bushskinz steps Rhino bars front air locker OME susp 265/75R16 AT's
PCRman wrote:IMO oil filters are only needed if there is an expectation that the filter will get wet. (hence why they showed up on bikes first). Paper filters clog faster n' hell when wet. Not saying this is gosple truth just what I've always understood to be the case.
That's a good point. All my dirt bikes have come with an oil foam filter from the factory but how many cars come from the factory with a foam filter?
That is a lot of dust... I might go put the paper filter back in the zook now.
