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Why Are Air Filters Important? #4720487
04/08/18 11:44 AM
04/08/18 11:44 AM
Joined: Aug 2005
Posts: 4,563
NW Ohio
Jim Allen Offline OP
Jim Allen  Offline OP

Joined: Aug 2005
Posts: 4,563
NW Ohio
I'll tell ya...

The air intake system is the only connection between your engine's crankcase and the outside world. It's the only way outside contamination can make it into the engine. It's important to long engine (and lubricant) life that the air intake system be completely sealed and use the highest efficiency filter possible... one that allows the engine to reach it's rated power. Outside contamination begets increased wear. I contend that a high efficiency air filter is a higher priority than a high efficiency oil filter... if you have to pick one over the other. For myself, I would sacrifice a little upper end power for a high efficiency filter. Of course, if you face the quandary of not enough airflow to meet power requirements, you could consider increasing the filter area.

Yes, a higher efficiency filter will show more restriction sooner than vice versa. So what? That's what a filter restriction monitor is for. In any case, the fuel economy is not effected on an EFI car due to air filter restriction until the engine can barely run and a small power loss is usually not noticed in everyday driving. Lead-foots would be more conscious of this.

So, buy the highest efficiency filter you can (look for 99% plus on coarse dust tests, which is about 97% on a fine dust test... a rare spec to see). Make sure it seals well in the housing and that there are no leaks anywhere else in the system. Install a restriction gauge and replace the filter only when it reaches the right restriction (variable, about 10" of water, 2.5kpa is the generic number). If you were performance oriented and you saw the power coming off sooner, you could change sooner. Or, if you are economy minded, you could go higher. It will vary from engine to engine, depending on how you use the vehicle and how much filter area it has.


Jim Allen
Keepin' the Good Old Days of Four Wheeling Alive
Re: Why Are Air Filters Important? [Re: Jim Allen] #4720494
04/08/18 11:57 AM
04/08/18 11:57 AM
Joined: Mar 2008
Posts: 300
US
Shellguy Offline
Shellguy  Offline

Joined: Mar 2008
Posts: 300
US
Great post Jim...alot of people I know skimp on their air filter. I will forward this to them to read. I wish we had a list of bitog approved filters..Good to see you around buddy.


2012 F-150 5.0-Pennzoil Platinum 5w30/Amsoil Eao17
Re: Why Are Air Filters Important? [Re: Jim Allen] #4720495
04/08/18 11:57 AM
04/08/18 11:57 AM
Joined: Oct 2008
Posts: 13,159
The Old North State
Sayjac Offline
Sayjac  Offline

Joined: Oct 2008
Posts: 13,159
The Old North State
Welcome back Jim. I frequently quote and link some of your prior posts on AFs (efficiency and loading relationship) and OFs (holding capacity). I know you are big fan of AF restriction gauges. Good see a new contribution from you here. thumbsup

Re: Why Are Air Filters Important? [Re: Jim Allen] #4720507
04/08/18 12:15 PM
04/08/18 12:15 PM
Joined: Sep 2014
Posts: 1,587
Toronto Canada
WobblyElvis Offline
WobblyElvis  Offline

Joined: Sep 2014
Posts: 1,587
Toronto Canada
Where might the best information be for this? Such as independent studies or SAE papers etc.?
Information that proves dirt entering the via the air intake is a major [perhaps the biggest] contributor to engine wear and secondly, that a used filter [not yet overly restrictive] is more efficient.

Re: Why Are Air Filters Important? [Re: Shellguy] #4720531
04/08/18 12:43 PM
04/08/18 12:43 PM
Joined: Jul 2005
Posts: 31,870
NY
demarpaint Offline
demarpaint  Offline

Joined: Jul 2005
Posts: 31,870
NY
Originally Posted By: Shellguy
Great post Jim...alot of people I know skimp on their air filter. I will forward this to them to read. I wish we had a list of bitog approved filters..Good to see you around buddy.

True and a lot of people pay a lot of money for a K&N filter air intake kit, or whatever they call it. [The kind of air filter you apply their oil to and wash and reuse] to increase HP and have no clue what kind of damage they're doing to their engine. Expensive in the case of K&N can be bad too.


God Bless Our Troops

Re: Why Are Air Filters Important? [Re: demarpaint] #4720556
04/08/18 01:22 PM
04/08/18 01:22 PM
Joined: Dec 2011
Posts: 5,840
North Carolina
rooflessVW Offline
rooflessVW  Offline

Joined: Dec 2011
Posts: 5,840
North Carolina
Originally Posted By: demarpaint
True and a lot of people pay a lot of money for a K&N filter air intake kit, or whatever they call it. [The kind of air filter you apply their oil to and wash and reuse] to increase HP and have no clue what kind of damage they're doing to their engine. Expensive in the case of K&N can be bad too.

Sorry, but have you ever heard of a K&N causing an engine failure?

Fried MAF from over-oiling, sure. Maybe a K&N isn't 99.9% efficient at a half micron, I'll give you that... But over the course of typical ownership, what harm does it really do? Heck, even extended ownership.


"Zed's dead baby, Zed's dead."
Re: Why Are Air Filters Important? [Re: rooflessVW] #4720559
04/08/18 01:24 PM
04/08/18 01:24 PM
Joined: Sep 2014
Posts: 1,587
Toronto Canada
WobblyElvis Offline
WobblyElvis  Offline

Joined: Sep 2014
Posts: 1,587
Toronto Canada
Interesting test involving KnN at this site.
http://nicoclub.com/archives/kn-vs-oem-filter.html

Re: Why Are Air Filters Important? [Re: Jim Allen] #4720561
04/08/18 01:29 PM
04/08/18 01:29 PM
Joined: Aug 2010
Posts: 12,916
Northern Kentucky
901Memphis Offline
901Memphis  Offline

Joined: Aug 2010
Posts: 12,916
Northern Kentucky
Jim is alive!


2012 Chevy Cruze LT 1.4T - 62k - Edge 0w30 SL + Mahle OX401D
2002 Buick Century 147k - Built 4T65e(Maxlife) - GTX 5w30 + Fram XG3980
Re: Why Are Air Filters Important? [Re: Jim Allen] #4720564
04/08/18 01:31 PM
04/08/18 01:31 PM
Joined: Jun 2005
Posts: 929
Danville, Indiana
IndyFan Offline
IndyFan  Offline

Joined: Jun 2005
Posts: 929
Danville, Indiana
I've got a friend with a Saab 9-4, and he has run a K&N since new. He is approaching 300,000 miles, and the car runs great.

That said, the K&N is not my cup of tea. I like a high efficiency paper filter that is easy to change, and I don't like the mess or headache of oiling a filter.

I doubt a K&N, properly maintained and used, has caused an engine to wear out significantly sooner than it would have with a paper OEM filter.


18 Jeep JLUR Wrangler 3.6 18k
15 Ford Transit 120k, Reman 3.5 @85k
08 Jeep Wrangler 3.8 131k
01 Ford F150 Crew 5.4 85k
99 Mercedes E430 Sport 92k
Re: Why Are Air Filters Important? [Re: rooflessVW] #4720570
04/08/18 01:37 PM
04/08/18 01:37 PM
Joined: Jul 2005
Posts: 31,870
NY
demarpaint Offline
demarpaint  Offline

Joined: Jul 2005
Posts: 31,870
NY
Originally Posted By: rooflessVW
Originally Posted By: demarpaint
True and a lot of people pay a lot of money for a K&N filter air intake kit, or whatever they call it. [The kind of air filter you apply their oil to and wash and reuse] to increase HP and have no clue what kind of damage they're doing to their engine. Expensive in the case of K&N can be bad too.

Sorry, but have you ever heard of a K&N causing an engine failure?

Fried MAF from over-oiling, sure. Maybe a K&N isn't 99.9% efficient at a half micron, I'll give you that... But over the course of typical ownership, what harm does it really do? Heck, even extended ownership.


I read UOA's they typically show extra wear, that's good enough for me. You've been around it has been discussed here many times, the general consensus has been they're not good. And it also fits into this topic perfectly.


God Bless Our Troops

Re: Why Are Air Filters Important? [Re: WobblyElvis] #4720571
04/08/18 01:38 PM
04/08/18 01:38 PM
Joined: Nov 2017
Posts: 683
South Carolina
eyeofthetiger Offline
eyeofthetiger  Offline

Joined: Nov 2017
Posts: 683
South Carolina
Originally Posted By: WobblyElvis
Interesting test involving KnN at this site.
http://nicoclub.com/archives/kn-vs-oem-filter.html


Good link. Air filters are so generic and variable in their construction that you really have to pull each one out of the box and look.
I wish the test included a second round with a pantyhose prefilter.


2017 Ford Fiesta 1.0T - Valvoline SynPower 5W-20, Motorcraft FL910S
1988 GMC K1500 4.3/700R4 - Supertech 15W-40, Fram TG3980
1986 Ford Ranger 2.0 - uhh
Re: Why Are Air Filters Important? [Re: Jim Allen] #4720588
04/08/18 02:05 PM
04/08/18 02:05 PM
Joined: Oct 2014
Posts: 13,546
Canyon County Idaho
CT8 Online content
CT8  Online Content

Joined: Oct 2014
Posts: 13,546
Canyon County Idaho
The best oil filter is the air filter


2015 F150 2.7
2018 F350 6.2
Re: Why Are Air Filters Important? [Re: WobblyElvis] #4720601
04/08/18 02:18 PM
04/08/18 02:18 PM
Joined: Aug 2005
Posts: 4,563
NW Ohio
Jim Allen Offline OP
Jim Allen  Offline OP

Joined: Aug 2005
Posts: 4,563
NW Ohio
Originally Posted By: WobblyElvis
Where might the best information be for this? Such as independent studies or SAE papers etc.?
Information that proves dirt entering the via the air intake is a major [perhaps the biggest] contributor to engine wear and secondly, that a used filter [not yet overly restrictive] is more efficient.


So you doubt it? How can you? It's a closed system, the only way outside dirt can enter is via the intake system (well, except for ancient cars with road draft tubes). Internal normal wear and the resultant particulate contamination is a separate issue but that wear is effected, can be greatly effected, by how much dirt gets by the rings.

If you go back and look at my older posts (it will be back before 2014) I cite most of this. But yes, it came from various peer reviewed papers. See the synopsis article I did that is linked, which is a layman's overview.

Air Filters


Jim Allen
Keepin' the Good Old Days of Four Wheeling Alive
Re: Why Are Air Filters Important? [Re: eyeofthetiger] #4720641
04/08/18 03:01 PM
04/08/18 03:01 PM
Joined: May 2012
Posts: 953
Rio Rancho, NM
Pajero Offline
Pajero  Offline

Joined: May 2012
Posts: 953
Rio Rancho, NM
Pantyhose worked well when Mt. St. Helen's blew in 1980. I live in the desert (large sandbox) and installed a Snorkel. People make fun of me because they think it's for water. It's because of dust. Ever going wheelin with a bunch of 4x4...the dust is horrid. Cyclonic filters are the best for worst conditions...



Respectfully,

Pajero!


Always remember "Planned obsolescence."

1994 Montero SR 3.5 DOHC, 133,xxx
Fram Ultra/ Snorkel with Pre-filter
K-9-Co-pilot
Re: Why Are Air Filters Important? [Re: Jim Allen] #4720644
04/08/18 03:05 PM
04/08/18 03:05 PM
Joined: Sep 2014
Posts: 1,587
Toronto Canada
WobblyElvis Offline
WobblyElvis  Offline

Joined: Sep 2014
Posts: 1,587
Toronto Canada
Originally Posted By: Jim Allen
Originally Posted By: WobblyElvis
Where might the best information be for this? Such as independent studies or SAE papers etc.?
Information that proves dirt entering the via the air intake is a major [perhaps the biggest] contributor to engine wear and secondly, that a used filter [not yet overly restrictive] is more efficient.


So you doubt it? How can you? It's a closed system, the only way outside dirt can enter is via the intake system (well, except for ancient cars with road draft tubes). Internal normal wear and the resultant particulate contamination is a separate issue but that wear is effected, can be greatly effected, by how much dirt gets by the rings.

If you go back and look at my older posts (it will be back before 2014) I cite most of this. But yes, it came from various peer reviewed papers. See the synopsis article I did that is linked, which is a layman's overview.

Air Filters


Never said I doubt it and it makes perfect sense. I just to learn from the best sources I can, not hearsay.
Thank you for the info.

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