Epicuser said:

Low powered?

Click to expand...

By "Low Powered" I mean, engine output against air filter area. The TD4 has a larger filter area the the 1.8 or V6 petrol Freelander engine. Both in theory would consume more air that of the TD4 but only have atmospheric pressure to push the air into the engine.
A typical standard paper filter when new will pass something like 3.8 Qubic Ft per Minute per square inch of area at normal naturally aspirated engine depression. Large area means good filtration at high flow rates. Then there is a turbo to pull air through. A foam filter will flow slightly more air per square inch than pleated paper but will let through lots more dirt too. Because the filter area to engine power ratio is pretty large on the TD4, there isn't any real gain in fitting a foam filter. However there are lots of reasons why not to fit one. Engine/ turbo life being the main two.

Datatek said:

Both are a waste of cash and the K&N is likely to knacker the MAF. Google K&N effects on the MAF.
The paper filter is capable of passing considerably more air than is needed to allow for degredation as it clogs.

Click to expand...

Aaahhh that's it. It all comes back now. Quite a while ago there was a thread on here about k&n and the filter oil buggering the MAF up.
That's was why I researched the filters and found the pipercross that didn't need oiling.
But, thankyou for the: information about engine damage. I will look into it further and if need be go back to paper elements.
Cheers
Mike

Skinny Mike said:

Aaahhh that's it. It all comes back now. Quite a while ago there was a thread on here about k&n and the filter oil buggering the MAF up.
That's was why I researched the filters and found the pipercross that didn't need oiling.
But, thankyou for the: information about engine damage. I will look into it further and if need be go back to paper elements.
Cheers
Mike

Click to expand...

K&N is a fashion acessory like Louis Vuiton handbag and about as much use

Datatek said:

K&N is a fashion acessory like Louis Vuiton handbag and about as much use

Click to expand...

So would you recommended an o.e filter or just the cheapest you can find?
Mike

after reading what Nodge68 points out ..
rekon i'll stay with the landy paper filter

hd3 said:

after reading what Nodge68 points out ..
rekon i'll stay with the landy paper filter

Click to expand...

Some years ago I did some testing on various filter types. At the time I was working for a company that had a flow rig, this proved handy for the purpose. I found that pretty much all paper filter material rolled out flat passed the same amount of air per square inch. What did alter between filter manufacturers was how many pleats were in a given filter size. Thus how much paper was used.
So armed with this knowledge, it's only a question of finding a filter with lots of pleats for good flow. Obviously the larger the area the slower the clog rate and the longer the filter will last between changes.

For a high power naturally aspirated engine without a MAF then a K&N in a properly designed housing is pretty hard to beat.
For turbo diesel TD4 with its large standard filter, any kind of performance filter will generally do more harm than good.

Paper filter all the way for a 4x4 (Laning etc)......All others no matter what they claim just let too much dirt into the engine..