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George
Dodge Dakota
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6/23/2005
00:26:43
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 Subject: Intake Air Filters
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There I was - minding my own business, just like everybody keeps telling me to do, and I found this site.
http://home.usadatanet.net/~jbplock/ISO5011/SPICER.htm
It's full of intake filter efficiency graphs and data and stuff, but if you ever cared about how your K&N stacks up against my basic OEM filter, go check it out.
There's also a few paragraphs at the bottom of the site that are worth reading.
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soooo?
Dodge Dakota
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6/25/2005
09:28:21
| RE: Intake Air Filters
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that report says K&N and then Amsoil filters, are in that order the worst two air filters to buy, right?
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Sam
Dodge Dakota
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6/26/2005
02:26:35
| RE: Intake Air Filters
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Only if you want your filter to catch dirt.
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ok
Dodge Dakota
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6/26/2005
17:36:06
| RE: Intake Air Filters
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so with the tests of the air filters. how long (as in months or years) is that build up for regular everyday driving. compared to what they are dumping in the air flow on purpose.
I find it funny that a GM air filter did the best. wonder if it was because it was on a GM truck. you will always have particles passing through your intake. after all if you filter out everything. yo uwould get no air in to your engine. just like filter water. it dont flow as fast as regular water out the tap. how many people drinks unfiltered water out the tap. they are all fine. =-)
this test is just someone who was bored and said hey lets do this. if it was really harmful to cars and trucks motors why hasnt anyone posted this prob of. hey my truck is screwed up because I used a K&N filter and it let dirt build up in everything. also K&N states on all their boxes. do not use in off road applications. unless you use the foam cover on their filters. also dealerships would say you cant put a filter like K&N on your vehicle. if the air was that dirty. what about our lungs. wouldnt we be falling over with clogged up lungs. after all we live longer than all cars and trucks. plenty of time to get our lungs all clogged with dirt. we dont have a efficent filtering system on us.
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George
Dodge Dakota
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6/26/2005
19:03:04
| RE: Intake Air Filters
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It's a link to some interesting information about air filters I wanted to share.
For those who only looked at the pictures, the very first sentence is "This report presents the results of an ISO 5011 test of several air filters designed for the GM Duramax Diesel"
Maybe the ac/delco filter IS the best. Don't know, but it seemed to filter the air better than all the others.
What's typically downstream of the air filter these days that dirt can do bad things to: Idle Air Control, MAF sensors, MAP sensors, etc.
On the 4.7L engine, the PCV valve dumps into the intake mainfold back by the firewall in a low area where the incoming air is making a U-turn. The PCV valve passes oil and oil vapors into the manifold. Oil catches some of the dirt that gets through the filter, and over time builds up crud in the manifold.
Draw your own conclusions, but do read those few paragraphs down at the bottom of the page.
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Lurkin
Dodge Dakota
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6/27/2005
10:53:27
| RE: Intake Air Filters
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George posted some good information, but you do need to read the text as it tells you the test methodology. The pretty pictures don't tell the whole story by themselves.
The summary is "pick flow, or pick filtering", you don't get both. This is not new. Paper filters have always held the filtering crown, while oiled guaze (K&N) has held flow.
Oil analysis has shown higher level of silica when a K&N-style filter is in place. _Many_ oil analysis' have shown this.
Is it significant enough to cause engine problems? Good question. We have all heard the "...I had a 1985 Forevy Streamliner XT that went 2 million miles with a K&N with no problems..."
The other question is, is the flow restriction from a paper filter significant, given that your engine spends most of it's time in part-throttle operation. Another good question.
I myself have seen enough evidence against K&N-style filters, that I have decided to stay with paper, or oiled foam. Just my own opinion.
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