top hose
10-09-2006, 12:14 PM
#1
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top hose I know from looking at the catch can threads that the bottom hose on the throttle goes to the PVC system. The top line goes from throttle body to the valve cover . What is its purpose?
10-10-2006, 02:05 AM
#2
Here's some good information.
Originally Posted by kp
Thats the fresh air line for the PCV, since its in front of the throttle blade it pulls no vacuum.
It has two purposes in stock form, it pulls clean air from the air filter into the crankcase and also that air is metered through the MAF since its a closed system that same air goes back into the intake though the PCV valve.
On a forced induction car that line will cause the crankcase to be pressurized since the boost is going straight into the crankcase. You need to cap the port off on the TB and either run a breather on the valve cover or a hose down to the blower/turbo inlet from the valve cover. The reason you feel air coming out is because the bypass isnt big enough to bleed all the pressure off from the blower at idle. Cap it off and use a breather, probably pick up a little boost and your rings will thank you
It has two purposes in stock form, it pulls clean air from the air filter into the crankcase and also that air is metered through the MAF since its a closed system that same air goes back into the intake though the PCV valve.
On a forced induction car that line will cause the crankcase to be pressurized since the boost is going straight into the crankcase. You need to cap the port off on the TB and either run a breather on the valve cover or a hose down to the blower/turbo inlet from the valve cover. The reason you feel air coming out is because the bypass isnt big enough to bleed all the pressure off from the blower at idle. Cap it off and use a breather, probably pick up a little boost and your rings will thank you