Is the upper crank vent pressurized doing boost leak test?

[Jonas_R]

Quick question

If I pressurize from the TB to get all the vacuum pipes and other system connected to the intake manifold.

Will the upper crank ventilation be under pressure or does the valves close it off?

[Rusty]

One way valve stops boost leaking to the vent system.

[Jonas_R]

I'm running your swirl pot & catch tank system.

So oem system is gone.

So will the upper crank vent by under pressure or is it sealed by the intake/exhaust valves?

[diesel des]

Depends on if you left the check valve in.

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[Jonas_R]

What check valve are you referring to?

[diesel des]

There is one that connects to the intake manifold and only allows air into the manifold and not boost out. It is used to allow the crank vent in the the manifold at low loads. At high loads it goes into the turbo intake.

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[Jonas_R]

The N80 valve is connected directly to the intake manifold, so no one way valve.

So upper and lower crank vent goes to a swirl pot and from there to a catch tanks that vents to atmosphere

PRJ mentioned somewhere that to test all the vacuum hoses, isv, etc connected to the manifold one could do a boost leak test from MAF hose and just block off wg pipe and pcv in maf hose.

However I just want to do it from TB instead, makes no difference.

So when I put pressure via TB into the intake manifold, then the following will happen that I know off:

1. Air will go through the connection to the N80 valve
2. air will go through all small vacuum hoses
3. air will go through isv

What Im not sure off is the following:

1. Wont the air just piss by the intake/exhaust valves?
2. Will air reach the upper crank vent?