BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > charcoal filter delete

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      08-07-2012, 10:34 AM   #23
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+1 to what Gumby Said
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      08-07-2012, 11:12 AM   #24
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It is there to catch emissions leaving the engine back out through the intake when it is shut down. Vapors and such will evaporate back out through the intake. It is supposed to catch them.

Originally Posted by monza2t View Post
This is not an official part of the emissions controls, its one of those gimmicky things like Volvo's catalytic radiator.

Activated charcoal certainly does hold on to pollutants. You have to have a thermal reactivation to release the crap that it holds onto. You arnt going to get that in the air filter box. And at a rate of 3L of air every other revolution, there is ~3600L of air flowing past it at 60mph in 1mile. Its not going to last long as an 'emissions device'
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