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Discussion Starter · #1 ·
Hey I was just wondering, what is it that the PCV line does? the line coming off the PCV valve that connects to the intake system is the one I am referring to, not the one that connects to the throttle body.

I ask because I am in the process of making a new intake system, and the PCV line right now connects to a bend up by my air filter. Does the line need to be connected to the intake system specifically, or does it just need to be connected to ambient air? I think I have seen someone run a direct small air filter off of the PCV nipple itself.

Just curious and want to understand it's exact purpose before I decide where to run the line.
 

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Hey I was just wondering, what is it that the PCV line does? the line coming off the PCV valve that connects to the intake system is the one I am referring to, not the one that connects to the throttle body.

I ask because I am in the process of making a new intake system, and the PCV line right now connects to a bend up by my air filter. Does the line need to be connected to the intake system specifically, or does it just need to be connected to ambient air? I think I have seen someone run a direct small air filter off of the PCV nipple itself.

Just curious and want to understand it's exact purpose before I decide where to run the line.
Well, the PCV system is designed to alleviate pressure buildup in the bottom end of the engine block. It has to evacuate the air someplace. The air being evacuated, however, contains a lot of pollutants... so it's more ecologically beneficial to route that air back into the intake system to have another go at combustion. An open-air setup just dumps the pressure into the atmosphere.

They both provide effective crankcase pressure relief, but the open-air filter setup pollutes in the process.
 

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Discussion Starter · #3 ·
Well, the PCV system is designed to alleviate pressure buildup in the bottom end of the engine block. It has to evacuate the air someplace. The air being evacuated, however, contains a lot of pollutants... so it's more ecologically beneficial to route that air back into the intake system to have another go at combustion. An open-air setup just dumps the pressure into the atmosphere.

They both provide effective crankcase pressure relief, but the open-air filter setup pollutes in the process.
Yeahhh I got no cat on the car anyway so I might as well continue polluting. Then again, maybe I should limit my polluting to just no cat...

Thanks.
 
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