After market air filter for WH 06 CRD

[bodgie]

Originally Posted by fester

Are the big earthmoving/transport diesel filters made out of similar paper material ot the factory car filters. There is a filter wash business next to where I'm working and I'm intrigued as to how they go about washing them.

Some filters are washable out of the box, certain Donaldson filters are for sure. The Donaldson filter I had in my landie had a washable outer and a disposable inner element for safe measure.

Sounds like you need to pop your head in Gavin and see what they do.

Jason

[fester]

Originally Posted by bodgie

Some filters are washable out of the box, certain Donaldson filters are for sure. The Donaldson filter I had in my landie had a washable outer and a disposable inner element for safe measure.

Sounds like you need to pop your head in Gavin and see what they do.

Jason

Yeah but then I'd look like a bit of an inexperienced nerd.

[bodgie]

Some more testing, done by 4WDAction so it has gotta be good

http://www.4wdaction.com.au/articles/2012/all-choked

[Cherokee30D]

I don't believe that Dyno testing is the best way to compare air filters as it does not replica 'real life' situations.
On the dyno, the fan is usually at a constant speed and the temperature does not alter, whereas in a real life situation, the faster you drive the more airflow is created and the colder the air gets, meaning that the less restrictive filter will perform better.
Kind of makes sense to me

Cheers, Craig

[bodgie]

Originally Posted by Cherokee30D

I don't believe that Dyno testing is the best way to compare air filters as it does not replica 'real life' situations.
On the dyno, the fan is usually at a constant speed and the temperature does not alter, whereas in a real life situation, the faster you drive the more airflow is created and the colder the air gets, meaning that the less restrictive filter will perform better.
Kind of makes sense to me

Cheers, Craig

Hi Craig, looks like we'll have to agree to disagree on this one.

Some final comments though, if a "performance" filter is installed in a standard airbox and the actual power produced goes down from a standard paper element the filter is more restrictive. No positive pressure generated by driving around will improve this result.

Dyno testing produces real, repeatable (minor changes due to atmospheric conditions, temp etc...) results, if they didn't they wouldn't be as widely used as they are.

The 4WD Action testing engaged a NATA testing lab to test the actual performance of the filter media. As you can see the K&N filter passed more dust than the paper elements. While not much worse than the paper elements it is worse at keeping dust out of you engine. This test also showed that there was no significant difference in performance between all of the filters, they didn't provide a graph of the test results which is a little disappointing though.

AIR FILTER PARTICLE TEST
AIR FILTER PARTICLES / M³ @ 5 microns
Uni Filter 2349.8
Terrain Tamer 4081.3
Genuine Toyota 4664.3
K&N 4982.3

Duration: 1 min
Pass Value: Less than 29,000 p/m³

I don't believe that oiled filters do MAF sensors much good long term, another reason not to use them IMHO. If you are happy with these types of filters that's fine, just make sure you are aware of the possible pitfalls and limitations.

I look at it this way, it they were the best way to go a number of manufacturers would use them as standard equipment.

[Brockie]

That AutoSpeed review is a bit of an eye opener, Bodgie. While not including any Jeep in its testing they did test many different vehicles and their conclusion was -

"Factory airfilters have excellent flow and they’ve also got filtration that matches the car manufacturer’s stringent criteria. Put a different filter in the box and not only will there be almost certainly no improvement in flow, there’ll also be an unknown decrease in filtering efficiency. That’s a pretty dumb combination to pay money for."

So aftermarket high flow filters don't actually increase airflow, they just have an inferior ability to clean the air. And even a very dirty OEM air filter has a barely recordable drop in air flow.

Done and dusted I think.

[Doc]

Do any members know of any tests at 20,000k intervals that have been done for filtration and flow
I would be curious to see the differences