Crankcase Ventilation Oil Trap - DIY




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  1. #1
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    Default Crankcase Ventilation Oil Trap - DIY

    I have seen a few oily turbo related threads recently.

    Apart from leaking turbo seals, the Crankcase Oil Vapor seems to be a big culprit.

    Does anyone have a DIY oil trap. Does it help? Some pictures?

    (Not Google pictures.... I can search that myself)
    Kobus

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    Default Re: Crankcase Ventilation Oil Trap - DIY

    I have done one on my V8 Cruiser. Will upload pics later
    It is not what you buy its what you build.

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    Default Re: Crankcase Ventilation Oil Trap - DIY

    Quote Originally Posted by grips View Post
    I have done one on my V8 Cruiser. Will upload pics later
    As promised. Well 3000km later and it does not have that much goo in it. I guess engine condition have something to do with it.
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    Default Re: Crankcase Ventilation Oil Trap - DIY

    Looks good. What is inside the trap?
    Kobus

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    Default Re: Crankcase Ventilation Oil Trap - DIY

    Normally there should be a divider (between in-and outlets) and some steel wool added to those type of catch cans, some of them are completely empty inside.
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    Default Re: Crankcase Ventilation Oil Trap - DIY

    I think Bfreesani built one out of a bit of PVC tube and some steel wool.

    Or he was going to.

    Something like this:

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    Default Re: Crankcase Ventilation Oil Trap - DIY

    I would use one of these:



    That should provide enough filtration and gas flow and you can see when it is grotty and replace the filter medium.
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    Default Re: Crankcase Ventilation Oil Trap - DIY

    No way Grips - A CNC milled canister? That is going overboard! You are putting the rest of us to shame.

    I havent used catch canisters since I had a 5-cylynder Audi. They work well, put are a pain (messy) to clean/drain.

    Usually you would have some mesh somewhere in the system to slow down the airflow and get the oil vapours to drop out of the airstream. Something like goldilocks will work well.

    The are many websites about catch canisters. Google is your friend!
    Some interesting ones I've seen, is ppl using compressor water traps.
    The are designed to extract liquid out of an air stream, you can see inside and if you leave enough space under it, easy to drain.
    PS Just do not get the auto-drain water traps!
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    Default Re: Crankcase Ventilation Oil Trap - DIY

    I built a silly one out of a plastic bottle, to test the idea back in 2007. When the bottle was no more, I would have changed it to something a bit more durable/permanent. Besides sweating slightly where my pipes enter and exit, its still going strong. I vent to atmosphere through a long pipe that ends in a chassis member. I don't even get a oil residue on the end of the pipe. Usually check every six months or so to see whats in the bottle, and so far have never found more than very little, to nothing.

    I also vent my dipstick pipe into the same system, as I found my dipstick pushing out constantly. First thought I had a problem with my engine at the time, but when I drowned the car in March 2008, and replaced the engine, it did exactly the same thing. My system seems to equalize the pressure between the sump and the tappet cover, and push very little to the catch bottle. And yes, I have checked to see if I actually do have movement through the pipes, so no blockages. I also think that if I was causing a problem, it would have shown itself in the 180k km it has been used this way.

    Remember that you have a slight vacuum between your filter and intake, and this will evacuate the contents of your breather pipe in a hurry, then on diesels, your fumes are hot and humid, and when it hits the cold air in the intake, it condenses.
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    Default Re: Crankcase Ventilation Oil Trap - DIY

    Quote Originally Posted by jelo View Post
    I think Bfreesani built one out of a bit of PVC tube and some steel wool.

    Or he was going to.

    Something like this:

    Never got that far, and would prefer it in steel. I think the big idea, is to get the gasses to slow down, but also cool down substantially before it exits the "trap". Its in the cooling that your breather gas turns back to a liquid.
    David/Hillbilly - 1997 SFA Nissan Sani 2,7 TD - 5" lift on 33" tires - Dual Transfer with 4.1 gears

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    Default Re: Crankcase Ventilation Oil Trap - DIY

    Quote Originally Posted by bfreesani View Post
    Never got that far, and would prefer it in steel.
    4" galvanised pipe would work

    with some pipe ends and some barbed fittings and a bit of copper pipe inside

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    Default Re: Crankcase Ventilation Oil Trap - DIY

    Quote Originally Posted by jelo View Post
    4" galvanised pipe would work

    with some pipe ends and some barbed fittings and a bit of copper pipe inside

    Nice, I like, but I also would like to move it to a cooler spot to allow for better cooling, and easier empty of the can. Mine has to be disconnected and removed. The pipes are pushed through the top of the bottle cap, and is a pain to remove and clean. Lucky I don't have to do it very often at all.
    David/Hillbilly - 1997 SFA Nissan Sani 2,7 TD - 5" lift on 33" tires - Dual Transfer with 4.1 gears

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    Default Re: Crankcase Ventilation Oil Trap - DIY

    Quote Originally Posted by B_Engel View Post
    Normally there should be a divider (between in-and outlets) and some steel wool added to those type of catch cans, some of them are completely empty inside.
    The inlet is extended into steel mesh.
    It is not what you buy its what you build.

  14. #14
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    Default Re: Crankcase Ventilation Oil Trap - DIY

    Look what I found in my archives.

    Clean-up and new Z123 filter and it should do the job.
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    Kobus

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    Default Re: Crankcase Ventilation Oil Trap - DIY

    That should work lekker. Off topic, but I wish I could find a relocation kit for my oil filter.
    David/Hillbilly - 1997 SFA Nissan Sani 2,7 TD - 5" lift on 33" tires - Dual Transfer with 4.1 gears

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  17. #16
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    Default Re: Crankcase Ventilation Oil Trap - DIY

    Quote Originally Posted by bfreesani View Post
    That should work lekker. Off topic, but I wish I could find a relocation kit for my oil filter.
    Think Mr Turbo stock them
    It is not what you buy its what you build.

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