18rgeu turbo pcv valve setup

[jabbatron]

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[litldv8]

just remembering that the fumes go OUT through the pcv not in as per your drawing before
neil

[jabbatron]

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[litldv8]

that is what your picture shows but the pcv valve wont allow it to flow that way
the note below it is right to reverse it but with a turbo wont the plenum but normally under some sort of boost (not full boost all the time)
neil

[jabbatron]

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[litldv8]

no point for the catch can then unless the the motor is shagged then
still a shit hot looking motor
neil

[o_man_ra23]

PCV is the hole between spark leads 2 and 3 on the cam cover.

You shouldn't need to plumb into the plenum at all. If you are going to run a catch can, you should plumb from the PCV to the catch can, then catch can to the intake pipe between the air filter and the turbo. You don't necessarily need to plumb the catch can back to the sump, but doing so will prevent you having to empty it on occasion.

The airflow pulling through the intake pipe during non-boost driving will be enough to ensure you will always be preventing pressure buildup in your crank case (the pressure is caused by blowby through your ring gaps, normally isn't much, but can increase significantly under boost). Under boost you will be pulling even more air through your intake, which will suck more at the catch can/PCV.

The unused port on your plenum can be replaced with a blockoff.

[jabbatron]

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[SillyCarS]

well im glad someone knew what they were talking about

+reps

[jabbatron]

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[o_man_ra23]

Bah, it's all good.

[jabbatron]

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[o_man_ra23]

It won't create a full on vacuum, however there will be plenty enough of a vacuum effect once you have lots of air rushing past. Atmo venting is illegal, and by putting it between the pod and turbo, you aren't creating any possibility of backflow (cannot pressurise).

[jabbatron]

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[thechuckster]

the vent from catchcan to the turbo inlet can be as big as you can make it. That pipe will only vent fumes when under boost (when the PCV is shut from lack of manifold vacuum).

fwiw, in my old 18RTE, I did the following:
- main rocker cover vent to catch-can
- smaller port on rocker cover to intake manifold (post throttle) via a PCV (random wrecker find)
- catch-can vented to turbo inlet only

I only had oil issues (too much entering the turbo) when the catch-can filled up. I had neglected to put a shield over the main rocker-cover vent so with large amounts of crank-case gas flow, it would take oil droplets to the catchcan. This filled the can fairly quickly, but all I had to do was drain it and wash the stainless-steel mesh with petrol, then refit.

edit: I did oil-up the PCV a few times. Again, from lack of shield on the port (in rocker cover).