Thread: First K&N filter clean, I wish I had millions of dollars

I'm not sure on the dust filtering capability of an oil-bath filter. But here there is a MF135 (very early model) which originally had an oil bath filter.
It was turbocharged to what was a modest increase in power (10-15%) and it began sucking the oil out of the cleaner and into the turbo.

Makes me wonder just how critical the sizing of those is for best operation?

Originally Posted by TD50WA

Hi all

K&N Air Filter Review - Debunking the Myths (and why OEM is better)
Cheers
Kev

This is a good link that flowed around years ago within the silvia and SR20 crowd.


the GM Duramax Diesel I believe is a gulf war hummer unit, basically big-very big surface area.not the sort of item you have on a road car. I had people looking for these filters for landcruiser and patrol conversions working out ways to have room under the bonnet. even had GMC ambulance owners looking for better filter.the normal unit was a tiny panel filter.


the data shows filters made to suit that vehicle. recommended for it. what it doent show is the spec for recommendation for total retention of dirt. American products used to print this info on filters and I luv to interpret it on the john deer Z9.


the GM and K&N filter restriction graph data meet at 180 gms of dirt but before that point the K&N flow more. no data is given for how much of this 180 grams are passed.


what is given is at 1/2 the time period of the GM filter more dirt has passed but in the write up it claims that it was clogged 3 times quicker.
they obviously didn't read their data.

oil bath on stationary engines, and the oil bath conversions you could get for EH holden.one big rev and hydrolic lock.

Originally Posted by Davehoos

oil bath on stationary engines, and the oil bath conversions you could get for EH holden.one big rev and hydrolic lock.

First time I have heard of this as a problem with oil bath aircleaners - and they were used on virtually every car from the late 1920s (no aircleaner at all before then) until the 1960s when they were gradually replaced by paper element filters. Some cars continued to use oil bath filters into the 1970s, including all Series Landrovers (except V8) to 1983, Citroen until 1975, and probably quite a few I can't immediately think of.

John

Originally Posted by Davehoos

This is a good link that flowed around years ago within the silvia and SR20 crowd.


the GM Duramax Diesel I believe is a gulf war hummer unit, basically big-very big surface area.not the sort of item you have on a road car. I had people looking for these filters for landcruiser and patrol conversions working out ways to have room under the bonnet. even had GMC ambulance owners looking for better filter.the normal unit was a tiny panel filter.


the data shows filters made to suit that vehicle. recommended for it. what it doent show is the spec for recommendation for total retention of dirt. American products used to print this info on filters and I luv to interpret it on the john deer Z9.


the GM and K&N filter restriction graph data meet at 180 gms of dirt but before that point the K&N flow more. no data is given for how much of this 180 grams are passed.


what is given is at 1/2 the time period of the GM filter more dirt has passed but in the write up it claims that it was clogged 3 times quicker.
they obviously didn't read their data.

I don't think the Duramax was ever fitted to a hmmwv. They used the GM 6.2/6.5 V8 diesels and recently are using "optimiser" engines which are essentially a redesign of the old 6.5 v8 to address the worst issues (but still idi). There certainly are duramax diesel conversions, but all aftermarket.

These are road going chev pickup filters in the test.

Someone on here recon the only test for an air filter was an oil test. So here is my Skoda Yeti after 15,000km with a K&N including a reasonable amount of dirt for a Yeti, Gunlom Falls and a few other NT roads in the dry season.

There oil analyst guy mentioned the high Aluminum but he didn't know this was only second oil change for this motor and it's still wearing in. Also plenty others have noted high aluminum on the 2.0TDI VW motor. Even though he mentioned it as high, it's only 18ppm and 10 - 30ppm is acceptable and it's more of a problem if it's seen with high silicon which it isn't.

Happy Days

The Disco oil is still coming and it will have included the Gibb River rd (with Mitchell Falls). I recon that should be a fair test of the K&N.

Happy Days.

Originally Posted by JDNSW

[ ... ] Some cars continued to use oil bath filters into the 1970s, including all Series Landrovers (except V8) to 1983, [ ... ]

With the resurrection of an old thread I thought I'd add new info to your list John. My old 1984 2.25 litre powered 110 cab/chassis had an oil-bath filter.