PCV Question
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Joined: Feb 2006
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From: Killeen, TX
Originally Posted by siadam,Oct 8 2009, 09:24 AM
In theory your motor wants a vacuum to pull out any unwanted crankcase pressure.
Since we are boosted, that doesn't work.
So, in order to accomplish something similar, we route our pcv ports on the valve cover to a centralized "tank" or seperator that will remove the oil from the air and vent the extra pressure.
Since we are boosted, that doesn't work.
So, in order to accomplish something similar, we route our pcv ports on the valve cover to a centralized "tank" or seperator that will remove the oil from the air and vent the extra pressure.
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From: Knoxville, TN
Originally Posted by ihiryu,Oct 7 2009, 08:24 PM
I'm also confused about this one, what I have is both of my valve cover vents T'eed into my one port of my catch can, then I have the other port going to the intake manifold.
I don't think it's working very well cause I smoke sometimes in boost.
Would this setup be sufficient;
Drill another hole into catch can, have each port have their own hole on the CC, and instead of using the last port of the intake manifold, moving it to the turbo intake.
I don't think it's working very well cause I smoke sometimes in boost.
Would this setup be sufficient;
Drill another hole into catch can, have each port have their own hole on the CC, and instead of using the last port of the intake manifold, moving it to the turbo intake.
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Joined: Jan 2008
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^Yep!
Under N/A conditions, the engine sucks! It sucks large quantities of air all the way from the air intake to the intake manifold, to the intake valve in the head. But when you go F/I, under boost, there's positive pressure, pressurized air all the way from compressor housing to the intercooler/aftercooler, and intake manifold. So if you hook up the crankcase and valve cover vents to your manifold, you'll pushing air (7psi, 10 psi, 24psi, whatever) inside the valve cover and the crankcase. That's real real bad, that may even cause oil starvation under certain conditions to the head.
So a PCV (stands for Positive Crankcase Valve) makes sure air doesn't enter under any conditions (including boost). It's a one-way valve, nothing else. You need it for boost for sure, unless both vents are venting into atmosphere, OR to atmosphere (not manifold) through a catch-can.
Better, route both to one good-size hose, say 1/2" ID, to your catch-can, then to your intake filter on the Novi1000 unit, or your turbo compressor side intake.
/end superlong rant.
Under N/A conditions, the engine sucks! It sucks large quantities of air all the way from the air intake to the intake manifold, to the intake valve in the head. But when you go F/I, under boost, there's positive pressure, pressurized air all the way from compressor housing to the intercooler/aftercooler, and intake manifold. So if you hook up the crankcase and valve cover vents to your manifold, you'll pushing air (7psi, 10 psi, 24psi, whatever) inside the valve cover and the crankcase. That's real real bad, that may even cause oil starvation under certain conditions to the head.
So a PCV (stands for Positive Crankcase Valve) makes sure air doesn't enter under any conditions (including boost). It's a one-way valve, nothing else. You need it for boost for sure, unless both vents are venting into atmosphere, OR to atmosphere (not manifold) through a catch-can.
Better, route both to one good-size hose, say 1/2" ID, to your catch-can, then to your intake filter on the Novi1000 unit, or your turbo compressor side intake.
/end superlong rant.
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