What is it?????
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On the left hand side of my95wrx there is a black plastic cylindrical shape thing, with two pipes coming off it, it is the thing right next to the upper radiator hose. Onw of the pipes constantly splits in 2. Wheat is it for as I notice no difference when the pipe disatatches, please help im puzzled!!!
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Boyo
It's part of the emmissions control equipment. It absorbs unburnt hydrocarbons (ie petrol) from the air that comes out of the engine when you've switched it off when it is warm. If you have had a car that is more than 15 years old, you may remember that smell of partly burnt petrol when you got out of the car. It removes that!
Is it essential? Given that a load of guys on this bbs run without any cats, and even those of us that do are running a less than economical car
, then I guess we aren't bothered about emmissions. The smell is not exactly strong, if at all noticable if you remove the canister.
If you do choose to remove the canister, don't forget to plumb the two hoses together as otherwise you are missing out the air filter for the breather.
Duncan
It's part of the emmissions control equipment. It absorbs unburnt hydrocarbons (ie petrol) from the air that comes out of the engine when you've switched it off when it is warm. If you have had a car that is more than 15 years old, you may remember that smell of partly burnt petrol when you got out of the car. It removes that!
Is it essential? Given that a load of guys on this bbs run without any cats, and even those of us that do are running a less than economical car
, then I guess we aren't bothered about emmissions. The smell is not exactly strong, if at all noticable if you remove the canister. If you do choose to remove the canister, don't forget to plumb the two hoses together as otherwise you are missing out the air filter for the breather.
Duncan
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It's part of the fuel breather system:
Mercilessly lifted from another site:
The theory of operation on the charcoal canister is that it absorbs gas fumes from the tank as it vents out of the tank during filling /expansion of the contents and also allows air to flow through into the tank as the gas is consumed. The hose from the cooling shroud blows air into the canister and that air vents to the aircleaner, where is the slightly 'enriched' airflow mixes with regular air sucked into the aircleaner and goes through the engine, burning up the gas fumes.
--end quote
So, one pipe is for air to cool the canister, one is input from the breather system with fuel fumes in it, and the other is the output with slightly cleaner air that gets fed into the air intake. (The picture above shows a K&N induction kit fitted - the standard box has the input at the bottom of the intake pipe)
It may affect mileage?
Someone with an in-depth knowledge should be able to better answer this, but at least that may prove somewhat useful. Caveat: this is just the results of a search
Mercilessly lifted from another site:
The theory of operation on the charcoal canister is that it absorbs gas fumes from the tank as it vents out of the tank during filling /expansion of the contents and also allows air to flow through into the tank as the gas is consumed. The hose from the cooling shroud blows air into the canister and that air vents to the aircleaner, where is the slightly 'enriched' airflow mixes with regular air sucked into the aircleaner and goes through the engine, burning up the gas fumes.
--end quote
So, one pipe is for air to cool the canister, one is input from the breather system with fuel fumes in it, and the other is the output with slightly cleaner air that gets fed into the air intake. (The picture above shows a K&N induction kit fitted - the standard box has the input at the bottom of the intake pipe)
It may affect mileage?
Someone with an in-depth knowledge should be able to better answer this, but at least that may prove somewhat useful. Caveat: this is just the results of a search
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Another quote:
The charcoal canister is part of the Evaporative Control System. The purpose of the canister is to trap gasoline vapors, and route them into the intake manifold so they can be burned in the engine. If the charcoal becomes saturated with fuel, the fuel vapors in the carburetor float bowl can not vent, causing pressure to build up in the float bowl. The pressure will then force the fuel into the engine and cause hard starting after shut down, rough idle or no idle, and poor gas mileage
And finally
The charcoal canister is part of the Evaporative Control System. The purpose of the canister is to trap gasoline vapors, and route them into the intake manifold so they can be burned in the engine. If the charcoal becomes saturated with fuel, the fuel vapors in the carburetor float bowl can not vent, causing pressure to build up in the float bowl. The pressure will then force the fuel into the engine and cause hard starting after shut down, rough idle or no idle, and poor gas mileage
And finally