Possible crankcase pressure problems???
Hi all. I’ve Recently had a bottom end built of a 1.6 with cp pistons and some rods. New rings bearings etc. having a problem where turbos are leaking oil from the compressor side. Had a precision 5557 on there at first and it was leaking bad. Rebuilt it. Same thing happens. Bought a cheap cx racing turbo. And it’s still leaking from the compressor side. Drain and feed lines are completely vertical. Stock Pcv system was replaced with a catch can. Also no oil in the exhaust port of the head. That’s my reason for thinking crankcase pressure is to high. And not allowing oil to drain properly. I’ve attached a picture to sort of be able to see catch can setup. -10an fittings welded on the front right side and rear left side.I can take a better one after work. Any insight would be appreciated. Thank you.
https://cimg4.ibsrv.net/gimg/www.mia...0ff1f7362.jpeg |
Restrictor on oil feed line? Are you sourcing oil feed from the block?
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Originally Posted by cpierr03
(Post 1542951)
Restrictor on oil feed line? Are you sourcing oil feed from the block?
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Is the catch can vented to atmosphere?
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Originally Posted by sixshooter
(Post 1542968)
Is the catch can vented to atmosphere?
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Step 1 vent catch can
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Originally Posted by matrussell122
(Post 1542987)
Step 1 vent catch can
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If both hoses go to a closed container, that's exactly the same as capping off both hoses at the valve cover.
Please tell me you understand this. |
Six i understand this completely is a basic concept :bang:
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Originally Posted by matrussell122
(Post 1543001)
Six i understand this completely is a basic concept :bang:
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So to sum this up you capped off the only routes for crankcase pressure to escape and now you don't know why you have excessive crankcase pressure?
Umm... |
Na I understand I’ve seen setups similar to this before with no breathers that have worked before. Think I’m gonna do a dual setup and put a breather on each. Hopefully that works.
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Originally Posted by xmacmiatax
(Post 1543116)
I’ve seen setups similar to this before with no breathers that have worked before.
https://cimg8.ibsrv.net/gimg/www.mia...69a649ff5d.png |
Originally Posted by xmacmiatax
(Post 1543116)
Na I understand I’ve seen setups similar to this before with no breathers that have worked before. Think I’m gonna do a dual setup and put a breather on each. Hopefully that works.
This is a simple concept. Cap off vent on the pcv side. Run big line from exhaust side into a VENTED can. Drill out the passage in the valve cover and add copper scrubbers. Then be done with it. |
Or just run both sides to a vented can.
The secret is not a secret. It's the venting part. Engines need venting. Even Briggs & Stratton have venting. You have never seen an engine without venting. Ever. You might not have understood where it was venting, but it was venting. |
Originally Posted by xmacmiatax
(Post 1543116)
Na I understand I’ve seen setups similar to this before with no breathers that have worked before. Think I’m gonna do a dual setup and put a breather on each. Hopefully that works.
1) sealed with 2 ports, one of them to a vacuum source 2) vented das it |
Alright I’ll try that thanks
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The OEM standard for dual catch can is back to the vacuum source, while the PCV and IM takes it to non vented catch can
http://www.radiumauto.com/Catch-Can-...ata-P1180.aspx |
Originally Posted by xmacmiatax
(Post 1543116)
Na I understand I’ve seen setups similar to this before with no breathers that have worked before. Think I’m gonna do a dual setup and put a breather on each. Hopefully that works.
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This is my dual catch can setup
Passenger side: PCV bung tapped for hose fitting (prevents weeping leak) -> Catch can -> Hose to PCV valve -> Another hose to Intake port from PCV -- This puts the PCV inline between the catch can and the intake manifold. Prevents pressurizing the catch can and keeps a large ID for the vacuum hose to slow airflow Driver side: Valve cover port --> Catch Can -> Port on filter @ turbo https://cimg5.ibsrv.net/gimg/www.mia...f7955aaa08.jpg |
The belly in that hotside vent hose will hold a fair amount of oil eventually.
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I'm curious if having that vacuum line on the front of the filter actually generates any vacuum
I doubt it |
Originally Posted by 18psi
(Post 1543274)
I'm curious if having that vacuum line on the front of the filter actually generates any vacuum
I doubt it Entirely dependent on the filter and how much air is being consumed. I've seen some with as bad as a 2 or 3 PSI pressure differential across the element. Just a note for others reading though... if you route lines like these to a vacuum source with check valves, now you have nowhere for blow by to go when you need venting most while in boost. |
So, when I run my hot side valve cover port to the air filter like that, it is basically instead of a small filter. Just a source of clean air, and somewhere for excessive boost blow-by to go when my check valve is closed.
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