Recent Topics
2019 i30 Nline 1.6T and first service (1500km)
by rov137 - 11/14/19 10:11 PM
Garbage Disposal Replacement
by bunnspecial - 11/14/19 09:58 PM
Nest thermostat
by miden851 - 11/14/19 09:06 PM
2011 G37X
by maverickfhs - 11/14/19 08:27 PM
Recommendations for oil filter
by dawgn86 - 11/14/19 07:38 PM
2001 Subaru Outback $2,300 OBO
by 14Accent - 11/14/19 07:16 PM
Brake Friction Code List
by 92saturnsl2 - 11/14/19 07:14 PM
Accord reached a milestone today!
by mclasser - 11/14/19 06:59 PM
Is an alignment absolutely needed after new tires?
by SouthDakotaDad - 11/14/19 06:11 PM
Redline Professional Series 5w20
by burla - 11/14/19 06:00 PM
Backup Camera
by George7941 - 11/14/19 05:26 PM
'11 Prius 15k OCI Amsoil 0W-20
by mdv - 11/14/19 05:16 PM
Lightweight easy up
by Redright9 - 11/14/19 05:00 PM
Thinking of getting a cat
by 53' Stude - 11/14/19 04:42 PM
Apple Watch users
by madRiver - 11/14/19 03:05 PM
It's here, arrived early still 1 week to wait
by BeerCan - 11/14/19 02:20 PM
Cooling leaks at hose to housing connections
by Fitz98 - 11/14/19 12:53 PM
Mercedes coolant mixed
by Rohan - 11/14/19 12:49 PM
Newest Members
rov137, Dorisy, DesktopDave, HPD, kildeth
69868 Registered Users
Who's Online Now
35 registered members (clinebarger, carlprop, csandste, Bailes1992, BlakeB, bdcardinal, 3 invisible), 925 guests, and 30 spiders.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums67
Topics297,431
Posts5,115,505
Members69,868
Most Online3,589
Nov 2nd, 2019
Donate to BITOG
Print Thread
Hop To
How do different types of air filters load up? #5048956 03/20/19 11:37 AM
Joined: May 2005
Posts: 4,957
Y
y_p_w Offline OP
OP Offline
Y
Joined: May 2005
Posts: 4,957
The filter I've dealt with the most is the standard Subaru 16546AA020 for my 2004 WRX. The factory one was made in Japan the "E" version I believe) with a oil media that had a red color. Ever since I've used OEM filters bought from dealers, although I had a stash of about 3 I bought for less than $10 each from a dealer in Washington selling them online. Also bought directly from dealers where the F version is now made in Mexico but otherwise identical to the ones that were made in the US.

Still - the OEM Subaru filter is a rectangular (reversible) panel and I've noticed that I could easily tell where the dirt was trapped. The vast majority of what it traps forms a crescent shape which is far heavier at the far edge of the pleats and the loading is deeper on the side where the air seems to flow. I look at a used filter and other than the edge I can reverse it and see very little filter loading on the other side of the pleats. I was thinking as it started loading up in the primary areas it should start loading along other parts of the filter, but it doesn't seem to do that. It even seemed somewhat caked since I hadn't changed the filter in a while, but still with most of the dirt right where it was loading. I thought maybe one could get away with reversing the filter, perhaps after brushing away some of the built up dirt. However, I've heard with oiled filters that often the loading helps improve filtering efficiency, although it may be at the expense of restriction.

In the past I changed the filter in my 1995 Integra GS-R, which had this funky cylindrical filter. However, it was dry and as far as I could tell the dirt seemed to load rather evenly around the entire filter. Looks similar on my wife's 2002 Civic LX with a dry panel filter with a thick polyester media and that seems to load up relatively evenly.

I don't remember exactly how it worked with the old cylindrical filters. I remember changing the round filters for a Chevy Lumina APV. They were lightly oiled paper. I believe it was a traditional design where the intake goes straight into the side of the filter and then through to the throttle body on the inside of the filter housing. That was what I remembered from my youth, with a round filter housing with an intake, along with a round cover that clamped down on the filter seal with a wing nut. I'm guessing that they tend to load up more on the media on the side of the intake?

[Linked Image]

Re: How do different types of air filters load up? [Re: y_p_w] #5048976 03/20/19 11:56 AM
Joined: Aug 2014
Posts: 664
S
SnowDrifter Offline
Offline
S
Joined: Aug 2014
Posts: 664
Yes that is correct


2005 Tahoe - 140k
2003 Forester(the swagger wagon) - Rehomed
1999 Passat - Rehomed
Re: How do different types of air filters load up? [Re: y_p_w] #5049055 03/20/19 01:04 PM
Joined: Aug 2003
Posts: 14,153
R
Rand Offline
Offline
R
Joined: Aug 2003
Posts: 14,153
unless you have a carbed engine or racing application you can usually run engine air filters for way longer than most** do.

**not you people who live on dirt roads


2019 Jeep Cherokee Trailhawk 2.0T
2020 Hyundai Elantra "Value Edition"
Re: How do different types of air filters load up? [Re: Rand] #5049067 03/20/19 01:19 PM
Joined: May 2005
Posts: 4,957
Y
y_p_w Offline OP
OP Offline
Y
Joined: May 2005
Posts: 4,957
Originally Posted by Rand
unless you have a carbed engine or racing application you can usually run engine air filters for way longer than most** do.

**not you people who live on dirt roads

I figured as such. No air filter I've removed looked like there were substantial particulates getting past the filter. The filter housing has always been spotless on the "clean" side, even when I might have gone 25k miles over the recommended change period. I'm guessing I might have even been able to go 100k miles on my Subaru OEM paper filters, although it would probably get pretty nasty after a while.

Still - I remember back when we first started having California Smog Check testing. If the first test failed, shops that were authorized to perform "repairs" (with a limit on the price of maybe $75) and would often suggest a new air filter as the first thing to do. Many of the testing sites are "test only" and not allowed to perform repairs under any circumstances. In many cases one might be required to get tested at one. I suppose the rationale is that they don't have an incentive to tweak the results in order to sell repairs.

Re: How do different types of air filters load up? [Re: Rand] #5049412 03/20/19 10:20 PM
Joined: Mar 2016
Posts: 2,420
C
CR94 Offline
Offline
C
Joined: Mar 2016
Posts: 2,420
Originally Posted by Rand
unless you have a carbed engine ...
My Mazda had a carburetor. Changing the air filter after well over 100k made no significant difference in power or mpg. The filter size was more generous than most, proportionate to the amount of air the engine consumed.


2011 Toyota Prius now at 106K
1981 Mazda GLC (323) retired at 606K
1972 Subaru DL retired at 190K
1954 Chevrolet retired at 121K
Re: How do different types of air filters load up? [Re: Rand] #5049413 03/20/19 10:20 PM
Joined: Mar 2016
Posts: 2,420
C
CR94 Offline
Offline
C
Joined: Mar 2016
Posts: 2,420
Originally Posted by Rand
unless you have a carbed engine ...
My Mazda had a carburetor. Changing the air filter after well over 100k made no significant difference in power or mpg. The filter size was more generous than most, proportionate to the amount of air the engine consumed.


2011 Toyota Prius now at 106K
1981 Mazda GLC (323) retired at 606K
1972 Subaru DL retired at 190K
1954 Chevrolet retired at 121K
Previous Thread
Index
Next Thread

BOB IS THE OIL GUY® Powered by UBB.threads™