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06-16-2009, 11:05 AM | #1 |
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Charcoal stage in air filter...what does it do?
It looks like most of the High Performance Air Filters improve air flow by eliminating the Charcoal Stage of the filter, and using just the large particulate filter (paper/gauze/oil).
So, whats the charcoal there for? Remove hydrocarbons? Remove water? I am looking at purchasing a high performance filter, but I'm just not wanted to take chances on causing engine damage if the charcoal actually is important. Thanks for any input Rick |
06-16-2009, 02:35 PM | #2 |
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http://en.wikipedia.org/wiki/Activated_carbon
Activated charcoal is capable of trapping very small particles because of its microporosity. I believe non-charcoal based filters do not clean the air as well as charcoal based ones (can someone confirm this?) |
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06-16-2009, 03:54 PM | #3 | |
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Hope this helps |
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06-16-2009, 04:04 PM | #4 |
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On the M5 the charcoal filters are meant to filter gasoline fumes that vent out of the intake path when the motor is shut off. Apparently the M3 has the same tendency. It's an emissions thing.
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06-16-2009, 04:14 PM | #5 | |
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i believe this is true. i've heard of this issue as well.
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06-16-2009, 04:47 PM | #6 | |
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Most likely, because of the intake tract design, and large amount of airspace in the plenumn, gas vapors can make their way out of the intake when the car is off. Thus, they installed charcoal filter media to absorb any rogue gasoline vapors. This way, along with a number of other things, BMW can comply with the regulations.
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06-16-2009, 05:54 PM | #7 | |
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06-16-2009, 06:10 PM | #8 |
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And by elimination the additional flow impedance of the charcoal stage you get a less restrictive intake system and hence some hp gain.
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