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Re: Air filter service life #491037 04/28/03 09:46 PM
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cheetahdriver Offline
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i have to agree with jason here. the thing that many don't realize is the amount of filter area these pleateds have. the OEM BMW filter has 10 SQUARE FEET of filtration media. the filter in the picture has a dusting of dirt on the upper 1/8th of the filter? as long as the pleats are holding (pleats stop working if they come in contact with each other) and the filter is physically sound, why change. there is no evidence of face loading on this filter, and the loading material seems pretty uniform and small.

that being said, i would also agree with jetfishn, depending on the local conditions, filter life is a major variable. i drive mostly highway, but live one mile back on a dirt road. my filters start looking pretty skanky about 20k (thats a technical term there). i would LOVE to have a filter change indicator. may look into fabbing one up. anyone who finds an easily installable one, drop me a line.

Re: Air filter service life #491038 04/28/03 10:10 PM
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OneQuartLow Offline
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Good work, Jason. I'm cheating by coming into the thread late, but... would have said the old filter had 5-10% restriction from new. Used to play with water manometers for measuring intake ducting improvements. Not terribly precise, but it was surprising how well a "dirty looking" filter continued working.

BTW, I've wondered about visual pressure drop indicators for a more deterministic approach. Our recent work on oil filter tests exposed me to some nice little PSID switches. I'll post when I figure out something that works and doesn't cost a fortune.

David

Re: Air filter service life #491039 04/28/03 10:12 PM
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TR3-2001SE Offline
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My drive to work is pretty consistant so I have done some milage test with three different filters. The first filter is the original OEM mazda miata filter from Japan with 48 pleats. Looks like the one pictured above. It has 20-25 thousand miles on it. It averaged 28.5
Next was an OEM filter from the dealer. It has only 20 pleats and has 5 thousand miles on it.
It averaged 29.5. Next was the Napa Gold with same number of pleats as Japan original ie 48 and with zero miles. Average milage 31.5. Seems like filters start to effect milage fairly quickly. I will see how quickly the milage changes with the new Napa Gold. Same gas used in all test,same tire pressure,constant mph using cruize control and simular weather.

Re: Air filter service life #491040 04/29/03 05:41 AM
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Sam Cheung Offline
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I would change it. You will feel slightly better engine response and may increase your mpg by 1!

Re: Air filter service life #491041 04/29/03 06:01 AM
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Sam Cheung Offline
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Pls ignore my other post which was supposedly to reply the 1st post.

Re: Air filter service life #491042 04/30/03 05:31 AM
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burnbomber Offline
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Real interesting post Jason. Thanks for this info. There's not as much said about air filters and change frequencies, than oil, filters, and frequency.

Re: Air filter service life #491043 05/01/03 12:14 AM
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dickwells Offline
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quote:
[/QB]Originally posted by Patman:
I put in a new Fram air filter. [/QB]

You are probably up on such things, but I thought I would mention anyway, that I have seen reports of the fine pink fibers detaching from a Fram filter and melting onto the MAF sensor, it acts like insulation or something. Beware.

Re: Air filter service life #491044 05/01/03 03:35 AM
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digitaldrifter91 Offline
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hehe im glad i dont have to deal with a MAF. but those red fibers, u refering to the newer fram line....x2 air filters?

Re: Air filter service life #491045 05/01/03 03:57 AM
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Patman Offline
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quote:
Originally posted by dickwells:
quote:
Originally posted by Patman:
I put in a new Fram air filter. [/QB]

You are probably up on such things, but I thought I would mention anyway, that I have seen reports of the fine pink fibers detaching from a Fram filter and melting onto the MAF sensor, it acts like insulation or something. Beware. [/QB]
The Fram filters I have on my wifes car and on mine don't have any pink fibers, the media is entirely white.

Re: Air filter service life #491046 05/01/03 04:41 PM
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dickwells Offline
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If the fibers are white I expect you are in the clear. The problem filters were those that show a cross section of a fiber on the box. It is a triangular shaped cross section extruded fiber and is supposed to catch more dirt. I guess the fibers/filters were orange rather than pink on bringing my memory up to 60% efficiency, (GR)

Re: Air filter service life #491047 05/01/03 10:51 PM
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novadude Offline
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**** ... I was just going to go buy a Fram filter too! Thanks for the info. Looks like even Fram air filters may be crap these days! [Frown]

Re: Air filter service life #491048 05/01/03 11:06 PM
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digitaldrifter91 Offline
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i forgot who, but who ever mentioned the fibers going on the MAF sensor is right i think. i have a 98 mercury villager and ever since i used fram x2 filters for the air, my car never really idled right. i bet some is on the MAFS. i just bought fram cause i was lazy. next time its a purolator air filter =), or stp or ne thing else. i dont have any proof but it sounds right =).

"my wheel lugs require more torque than your honda makes" <-----haha.

jay.

Re: Air filter service life #491049 05/17/03 05:47 PM
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widman Offline
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Filter life depends more on where you drive than how long you do it. 3 of my vehicles have red indicators that pop out when the pressure has dropped to the point of replacement.
On those that don't have the indicator, I use a general rule of change every 18,000 km or when the engine won't run at high rpm if it occurs first. But we drive in dirt.
http://www.widman.biz/Distribucion/Tarija/Autodromo/autodromo.html
http://www.widman.biz/Aplicaciones/Lipieza/lipieza.html
(that second link is only an emergency procedure, I am not recommending cleaning filters)

Re: Air filter service life #491050 05/17/03 10:04 PM
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digitaldrifter91 Offline
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where can i buy those indiators? my unles denali has it and its pretty neat.

Re: Air filter service life #491051 05/18/03 12:02 AM
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jeepzj Offline
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I came across this on the net and also saw it on Two Guys Garage on the Speed Channel. Anyone have this?


http://www.filterminder.com/air_filter_monitoring.htm

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