Honker filter
Drifting
Joined: Feb 2006
Posts: 1,339
Likes: 1
From: Lake Delton (WI Dells) WI
did you ever find this info out? I am looking for the same thing as I am not very keen on the filtering ability of oil inpregnanted cotton gauze filters. I would want to swap out the cotton gauze filter for a Wix or other paper filter that has better filtering efficiency.
Le Mans Master
Joined: Feb 2006
Posts: 5,762
Likes: 4
From: Chandler Arizona
did you ever find this info out? I am looking for the same thing as I am not very keen on the filtering ability of oil inpregnanted cotton gauze filters. I would want to swap out the cotton gauze filter for a Wix or other paper filter that has better filtering efficiency.
Drifting
Joined: Feb 2006
Posts: 1,339
Likes: 1
From: Lake Delton (WI Dells) WI
ahhhhh, thank you sir! I never thought of that and I can definately see what you are saying.
Even though I won't be driving this car in the rain very much, it will only take one time to render a paper filter useless.Paul
Le Mans Master
Joined: Feb 2006
Posts: 5,762
Likes: 4
From: Chandler Arizona
Drifting
Joined: Feb 2007
Posts: 1,537
Likes: 1
From: Southlake Texas
The article at www.duramax-diesel.com/spicer/index.htm interesting if you haven't seen it before.
All testing at the above site was was done under ISO 5011 procedures so you can trust the results. Some might find the poor performance of the K&N filter surprising, but GM is starting to crack down on cotton gauze filters because of increased engine wear.
OEM air filters are typically designed to achieve 99.5% filtering of fine dust (less than 2.5 microns) and better than 99.5% coarse dust (2.5 microns to greater than 80 microns). The better single layer cotton gauze filters achieved about 97.0% fine dust efficiency when tested under ISO 5011 standards (based on the tests I have seen and this is a big difference). Manufacturers may make a simple statement like: "traps 99.xx% of the dirt" without discussing the fine dust efficiency of their filters. Multi-layer gauze filters like S&B (and others) are more efficient than single layer cotton gauze filters and you might feel better using a similar product.
All testing at the above site was was done under ISO 5011 procedures so you can trust the results. Some might find the poor performance of the K&N filter surprising, but GM is starting to crack down on cotton gauze filters because of increased engine wear.
OEM air filters are typically designed to achieve 99.5% filtering of fine dust (less than 2.5 microns) and better than 99.5% coarse dust (2.5 microns to greater than 80 microns). The better single layer cotton gauze filters achieved about 97.0% fine dust efficiency when tested under ISO 5011 standards (based on the tests I have seen and this is a big difference). Manufacturers may make a simple statement like: "traps 99.xx% of the dirt" without discussing the fine dust efficiency of their filters. Multi-layer gauze filters like S&B (and others) are more efficient than single layer cotton gauze filters and you might feel better using a similar product.
Drifting
Joined: Feb 2007
Posts: 1,537
Likes: 1
From: Southlake Texas
You can find new reviews and tests that show similar results. The linked article is good because it includes data on several types of filters (paper, cotton gauze and foam) and was done under strictly controlled conditions.
The reduced filtering efficiency is a characteristic of the design and construction of cotton gauze filters. No free lunches. You trade filtering efficiency for less air resistance and more water resistance.
The reduced filtering efficiency is a characteristic of the design and construction of cotton gauze filters. No free lunches. You trade filtering efficiency for less air resistance and more water resistance.
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