Thread: Paper Filters are rubbish.

Why are you concerned how the dirty side of the paper filter looks?

It's the other side that matters.

That's the downstream side Dougal.




Without oil testing the OP has no idea what is going on, although I can hazard a pretty good educated guess

Originally Posted by Dougal

Why are you concerned how the dirty side of the paper filter looks?

It's the other side that matters.

In at the bottom, out at the top on those filters.

Our D2 had a K+N filter when I bought it. I removed it straight away and went back to genuine paper filters

I am assuming the airbox is closing / sealing properly Joel?

Ben,
Cancel those uni degrees, get a refund on all that hecs you paid
Those testing labs will have to be closed through threat of litigation
Sell the man - Hummel and donaldson shares!!!!!!!






Joel,
I have this once in a lifetime opportunity........
There is this bridge for sale in melbourne and I've secured the rights to sell a limited amount of shares.

In the words of Dave can I grab your vin and eng. number just for reference sake. (In case I want to get hold of a high km good condition motor)

Dc
(Don't need to look at pirate now, I've had my fix)
(Btw bills posting on pirate again these days- portal rover)

You're in an area of higher humidity. That's going to saturate out anything like paper and make it more likely to stain out with anything lodged in it. And that red stuff will stain. As said, the K&N is all about flow and keeping big bits out of engines that are getting rebuilt every few thousand k's. That's why it's full of holes. Your filter is doing it's job, is there any dust downstream in the inlet tract?

This was done to death quite a while ago and someone here tested it to high degrees and the paper won out every time.

If your paper filter is that dirty after 5000ks and your K&N isn't, then I reckon the paper is doing a better job, imagine how much dirt has gone into the engine using the K&N

Better having the dirt in the filter than in your engine, oh and if your not cleaning or changing your filter every 5000ks, then you should be, I do regardless of whether I'm travelling on dirts roads or not.

Baz.

I play with industrial vehicles working in all sorts of conditions.
The vehicles could be working anything thing from a sand blasting shop to a dust bowl of a yard/carbon black products/talc products.

All air filters with let a small amount of dirt though them.

The flat type paper air filters they fit in modern vehicles I am not a fan of as they tend to be hard to seal.

The traditional around type Donaldson paper will block up and choke off a motor and let little in the way of dirt though.( easy to change and cost effective)

As stated earlier oil foam air filters........just hold one up to the light.......and some of the poorer quality paper filters too.
They do not block up as quick and therefore do not catch the dirt.
Oil bath will work OK if looked after.(too much hard work for most people)

The best is centrifical type filters.
SK .....a Cummings company make a spinning precleaner device which works in the worst conditions and is self cleaning.

The paper filter shown earlier looks good to me.
The place to really look is not the paper filter , but inside the intake manifold and runners to see how much has gotten though.

Just about every air filter test ever done shows oil foam filters are great for engine performance IE less restriction, but trade that off in less dust/dirt protection

Originally Posted by joel0407

For those of you that think paper filters are as good as a quality oil cotton filter, you are kidding yourselves.

This is only after 5000km and less than 200km of dirt.

I have now gone to a K&N. This was the first time in over 10 years that I have run a paper filter in a vehicle and this is what I found. I have otherwise run K&N and always found anything south of the filter absolutly spotless and that included plenty of dirt tracks and road.

For those of you that aren't familiar with the filter. This is the engine side of my Discovery 2 filter.

I know some are going to tell me how good their paper filters are and I must have had a bad quality one (2 actually, one Ryco). And then I won't be able to do a proper comparison since I have fitted a snorkel at the same time I have fitted the K&N.

Unhappy Days.

I think your base issue is the poor location of the air intake on a D2, which sucks dusty air from behind the front wheel arch. On a dusty road, I could inundate any air filter in a couple of hundred kms, (sometimes in less than 40kms). I tried paper, unifilter etc at the time, all would be drowned with dirt way too early. I ended up modifying the air intake to draw clean air and have not had a problem since.

Unfortunately you have installed a snorkel so you will not be able to compare filters. Your now clean filter will be everything to do with the snorkel, not the filter.