LC Catch Can





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Thread: LC Catch Can

  1. #1
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    Default LC Catch Can

    Easter weekend for my wife and I is usually spend somewhere remote, either on the Wild Coast or up in the mountains somewhere. This year however, as for many, was a little different. So I spent the weekend making a catch can for my Land Cruiser.


    In my scrap pile I came across this old fire extinguisher. It was roughly the right size and, as a bonus, it has an aluminium canister.


    First the top came off



    The guts extracted



    And the powder emptied



    This is where I began.


    I must admit that there was very little planning and design involved and I was basically just making it up as I went along. The idea was to have the can in two halves, so that it can be opened and cleaned out periodically. It would have some filter media inside, most likely Goldilocks or something similar. I have come across one brand that is actually a complete spiral without little bits floating around.


    The canister will be inverted, with the screw cap at the bottom. Since it already has a hole in it, that will, with a bit of modification, be utilized for the drain pipe.


    This is the top cap, with the existing hole.






    The extra wings were removed, so that it looks like this.



    In my scrap drawer, I found this little fitting



    Which turns out to be a perfect fit.



    The inside was doctored with a little Wonder Fix Auto to form a nice funnel to the fitting.



    So now on to the canister. The plan is to cut the canister on the solid line and use the piece of scrap aluminium from my scrap pile to make a collar that will again join the two halves together. The small circle will most likely be where the inlet will be, with a baffle holding the Filter in place roughly where the dotted line is.







    Ready to cut. I parted it in the lathe to get a nice straight cut.








    What will eventually be the upper cap was threaded on the inside







    The chunk of aluminium was then turned down to size



    And the one end threaded to accommodate the top cap.






    The other side was turned down to fit snugly inside what would be the lower half. This will eventually be welded in place.



    I had to trim off this piece in order to maintain the overall length of the canister, as I still have the original mounting bracket and would like to use that as the final mount.



    Here is the complete canister with the mounting bracket.



    The collar welded in place



    And the can re-assembled.



    So today I will start on the pipes. The lower pipe will basically just have a 90° bend facing downward and not really an issue.


    The upper fitting though is a bit of an issue, as I need to pipe facing in the correct direction in relation to the lower pipe once the can is assembled and fitted.
    I will most likely make a swivel fitting protruding straight out the top with a 90°outlet. This will be able to swivel in any direction and will not be fixed. Will post some more when it it done.
    Last edited by ghouwens; 2020/04/14 at 11:25 AM.
    2014 LC76 4.5 V8

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  3. #2
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    Default Re: LC Catch Can

    I have no idea what a catch can is. Nice weld . What welder have you got.?

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  5. #3
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    Default Re: LC Catch Can

    Very neat build, my only concern would be that the mounting bracket may not be up to the task on severe corrugations.
    Pieter Greyling
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  7. #4
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    Default Re: LC Catch Can

    Quote Originally Posted by plunger View Post
    I have no idea what a catch can is. Nice weld . What welder have you got.?

    Panweld 200A AC/DC. That, however, is a crappy weld. I have only done aluminium welding for the sum total of about an hour, so really new to it.
    Last edited by ghouwens; 2020/04/14 at 10:02 AM.
    2014 LC76 4.5 V8

  8. #5
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    Default Re: LC Catch Can

    Quote Originally Posted by pjf110 View Post
    Very neat build, my only concern would be that the mounting bracket may not be up to the task on severe corrugations.
    I did have a similar concern as the original bracket is basically just a spring clip. However, the open end of the clip can accommodate a cable tie, and once it is cable tied there is no way of removing it without cutting the tie.
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  9. #6
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    Default Re: LC Catch Can

    What is a catch can and it's purpose, or is it a turbo protector to keep oil at turbo bearings during shut down of motor Thanks
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  10. #7
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    Default Re: LC Catch Can

    What is a catch can? : Ask google about PCV (Positive Crankcase Ventilation), blow by, oil mist, oil trap.
    Kobus

  11. #8
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    Default Re: LC Catch Can

    A catch can is to collect the oil from the crankcase vapour that would otherwise collect in the intercooler or foul up the turbo and intake manifold.
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  13. #9
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    Default Re: LC Catch Can

    Ghouwens has built a very nice system that I can only assume will reroute back to original intake position. I went the supposedly environmentally unfriendly route with letting the catch can vent to atmosphere. After seeing the amount of oil vapour that still pours out of the filter I will be reluctant to run a diesel again without a catch can.
    Pieter Greyling
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  14. #10
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    Default Re: LC Catch Can

    Nice job. It helps if you have the right tools and know how to use them.
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  16. #11
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    Default Re: LC Catch Can

    Quote Originally Posted by pjf110 View Post
    Ghouwens has built a very nice system that I can only assume will reroute back to original intake position. I went the supposedly environmentally unfriendly route with letting the catch can vent to atmosphere. After seeing the amount of oil vapour that still pours out of the filter I will be reluctant to run a diesel again without a catch can.
    Thanks PJF110. Yes, the system will feed back into the intake, hopefully a little cleaner than before.

    I have located what appears to be the perfect mounting spot on the side of the radiator fan cowl, next to the battery. Looks almost purpose made for the job.
    2014 LC76 4.5 V8

  17. #12
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    Default Re: LC Catch Can

    Probably telling you stuff you already know, but from reading up a little on the topic, the most important part of the whole setup is how it connects to the engine. If this is not done correctly, the oil is not extracted.
    1996 Patrol 4.2SGL with lots of stuff to make it heavier and thus increase traction?

  18. #13
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    Default Re: LC Catch Can

    Quote Originally Posted by Peter Connan View Post
    Probably telling you stuff you already know, but from reading up a little on the topic, the most important part of the whole setup is how it connects to the engine. If this is not done correctly, the oil is not extracted.
    Correct Peter. The idea is to get the vapour to cool as much as possible to allow it to condense. I have increased the size of the inlet and outlet to 22mm from the current 18mm. This will allow me to extend the piping without affecting the pressure. The further the air can travel before entering the catch can the cooler it will be.
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  20. #14
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    Default Re: LC Catch Can

    I had a chance to get this project to the 99% mark. I now just need to wait for lockdown to be a thing of the past, and then I can get some piping and a circlip to complete.

    I turned the plumbing fittings from some scrap aluminium heavy wall pipe.



    Then sectioned it and welded back up again to form the 90° bend I needed. I also welded in 3 small pins which would hold the "support baffle" in place.



    The top half (the cap) also got 3 pins and the hole bored for the outlet swivel fitting.



    This is the swivel fitting for the outlet. It has a groove cut in it to accommodate an o-ring.



    Here the o-ring is fitted. I also cut the groove for the circlip which will hold it in place.



    The outlet pipe was welded on. Test fit. Perfect.



    I got some cheap spoons from the Chinese shop ...



    and hacked them up to fit like this and form the baffles. One in the bottom ...



    and one in the top.



    3M pot scourers fit perfectly ...



    and 3 of them together nicely fill the space provided.



    And after a quick coat of my favourite Hammerite Satin Black, here is the completed can. Just need the circlip to hold the outlet in place and some rubber tubing to hook it all up.

    Last edited by ghouwens; 2020/04/20 at 06:59 AM.
    2014 LC76 4.5 V8

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  22. #15
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    Default Re: LC Catch Can

    That is a work of art. What a pleasure to see craftsmanship like this in this day and age.
    Phil
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