R50/53 Valve cover PCV and vent line
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1st Gear
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Valve cover PCV and vent line
Hello all. Did a search and didn’t find what I was looking for. Valve cover PCV and vent line. Vent line that goes from valve cover to intake tube, pressure or vacuum? On idle the tube has a good amount of vacuum. Is that correct? PCV valve to supercharger, can it be disconnected and sent to a catch can and plug supercharger line?
6th Gear
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From: Arnold, MO.
Vent line to the intake tube is neither, it's just a vent for recirculation of the crankcase. While it may have a slight amount of vacuum from air flow, it's basically for emissions and could be replaced by a simple filter.
As for the PCV line, there is debated as to whether it's needed on our engines, but regardless... That is where the vacuum comes from for the crankcase, if you disconnect that, there would be no vacuum to draw the oil residue into the catch can.
But yes that has where you line the catch can in.
As for the PCV line, there is debated as to whether it's needed on our engines, but regardless... That is where the vacuum comes from for the crankcase, if you disconnect that, there would be no vacuum to draw the oil residue into the catch can.
But yes that has where you line the catch can in.
Thread Starter
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1st Gear
Joined: Mar 2019
Posts: 45
Likes: 3
Vent line to the intake tube is neither, it's just a vent for recirculation of the crankcase. While it may have a slight amount of vacuum from air flow, it's basically for emissions and could be replaced by a simple filter.
As for the PCV line, there is debated as to whether it's needed on our engines, but regardless... That is where the vacuum comes from for the crankcase, if you disconnect that, there would be no vacuum to draw the oil residue into the catch can.
But yes that has where you line the catch can in.
As for the PCV line, there is debated as to whether it's needed on our engines, but regardless... That is where the vacuum comes from for the crankcase, if you disconnect that, there would be no vacuum to draw the oil residue into the catch can.
But yes that has where you line the catch can in.
change.
Now the crank case vent line is where I’m confused. I need to measure it with a gauge but it has a good amount of vacuum when disconnected from intake tube. Just wondering if that’s normal since the valve
cover should produce “positive crank case ventilation”. I’m wondering if the supercharger vent causes
that since both are attached to the valve cover. There is not check valves to separate each tube in the valve cover unless it’s hidden under that metal plate.
6th Gear
Joined: Nov 2004
Posts: 2,607
Likes: 315
From: Arnold, MO.
No it's not normal to have "a lot" of vacuum from the vent line.
the only check valve for the cover is the PCV, the vent line is open.
The only actual vacuum is from the S/C (PCV) line, this is why it's located where it is on the S/C intake tube, before the S/C but after the Throttle Body.
the only check valve for the cover is the PCV, the vent line is open.
The only actual vacuum is from the S/C (PCV) line, this is why it's located where it is on the S/C intake tube, before the S/C but after the Throttle Body.
Last edited by BlwnAway; Mar 11, 2019 at 08:56 AM.
Thread Starter
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1st Gear
Joined: Mar 2019
Posts: 45
Likes: 3
No it's not normal to have "a lot" of vacuum from the vent line.
three only check valve for the cover is the PCV, the vent line is open.
The only actual vacuum is from the S/C (PCV) line, this is why it's located where it is on the S/C intake tube, before the S/C but after the Throttle Body.
three only check valve for the cover is the PCV, the vent line is open.
The only actual vacuum is from the S/C (PCV) line, this is why it's located where it is on the S/C intake tube, before the S/C but after the Throttle Body.
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