Purpose of Charcoal Engine Air Filter?
I have been reading that many of you with stock air boxes remove the charcoal filter because it just adds to restriction, and after looking at mine was wondering why in the world MB spent the time and money to engineer and produce them. I understand the purpose of cabin and water charcoal filters to remove bad odors and tastes, but why in the world would you put them downstream from the engine intake filter? Those German engineers must have had some reason to spend the time and money as they always seem to save every possible penny! And if they do actually filter out something that would harm the engine, how often should they be replaced? Does anyone have an engineering explanation? Do any other models of MB cars use a charcoal filter?
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charcoal filters capture particles smaller than a standard paper or cotton fiber filter.
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It is an emission item actually to help with fuel vapor removal
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Originally Posted by roadkillrob
(Post 7301609)
It is an emission item actually to help with fuel vapor removal
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Originally Posted by roadkillrob
(Post 7301609)
It is an emission item actually to help with fuel vapor removal
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I don't think it's fuel vapors. If it were possible to collect them in the intake, the regular filters would collect them, with ROW boxes, or at least there would be some trace of them passing through, some condensation or smell.
Then the charcoal filters themselves would smell like gas and would be damp with it. I think it's a sound damper. Many cars have intake sound mufflers, snorkels and so on. This has to be some kind of noise regulation that they had to meet, for US/Canada. Because it's a sound damper, it can be designed not to ever need replacement and the intake design can be so that it doesn't loose any power. The first thing that people notice with ROW boxes is louder intake. I can add that there is no change in gas mileage. |
IIRC the purpose is to trap gas vapors from what I read at model launch. If so you can thank the friendly Nazis at California Air Resource Board.
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Originally Posted by bhamg
(Post 7302460)
IIRC the purpose is to trap gas vapors from what I read at model launch. If so you can thank the friendly Nazis at California Air Resource Board.
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