Crank Case Pressure

john68 · Sep 1, 2016

Hi Folks,
I recently woke up a 3.2 l Navara using the standard manifold & turbo from a 2.7 R50.
Results are pleasing to say the least....but I have a small amount of oil coming from the dipstick after running hard.
I have yet to install a catch can of any description, having been looking at the vented models , so currently has the standard 10mm breather plumbed back into the intake as per standard N/A 3.2.
I'm thinking this is my part of my issue, any further ideas let me know, blowback, turbo seals whatever I'm interested cheers

bods · Sep 1, 2016

Where is the factory breather connected? Pre or post turbo? It should be pre turbo, in saying that, the zd30 and yd25 motors run about double the diameter breather as that....

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john68 · Sep 1, 2016

Factory breather connects back in post turbo so causing a vacuum ?

bods · Sep 2, 2016

Well if it is post turbo, the turbo will be pressurising the crankcase whenever it comes on boost. It should suck the blow-by gas back into the turbo, not push air back into the crankcase...

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john68 · Sep 2, 2016

I like confirmation, many thanks BODs

Old.Tony · Sep 2, 2016

As above. On turbocharged or supercharged engines (let's use the proper collective term "forced induction" here) the crankcase breather needs to be connected to the intake of the super/turbocharger.

The exception is on the Interceptor - you'd plumb the PCV directly to atmo under the car. After all, which inspector is going to stop Max and examine his emission controls?

[YT]https://www.youtube.com/watch?v=SjxcQkGTyAw[/YT]

nuckin futs · Sep 4, 2016

whats the oil level like. if its slightly overfilled it will blow out the dipstick tube

happy john · Sep 4, 2016

john68 said:
Hi Folks,
I recently woke up a 3.2 l Navara using the standard manifold & turbo from a 2.7 R50.
Results are pleasing to say the least....but I have a small amount of oil coming from the dipstick after running hard.
I have yet to install a catch can of any description, having been looking at the vented models , so currently has the standard 10mm breather plumbed back into the intake as per standard N/A 3.2.
I'm thinking this is my part of my issue, any further ideas let me know, blowback, turbo seals whatever I'm interested cheers

What oil and grade are you running in the QD32?.

Rabbid-chop · Sep 4, 2016

Simplest way is to connect crankcase breather to vacuum source, ie; pre turbo, preferably with a catch can.

Crank Case Pressure

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