LS - 3rd Gen (2001-2006) Discussion topics related to the flagship Lexus LS430

Oil catch can how to with pics

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Old 01-28-18, 04:19 PM
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05ls430518
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Default Oil catch can how to with pics

This is my first write up i am missing stuff i know, but i have some pictures as well, so hopefully that will make up for it. You need transmission cooler line, regular radiator hose will not work, the oil will eat through them. I had extra steps because of my strut tower bar.

1. First decide mock up were you want your catch can to be, then take the side plastics and engine bay plastic off so your bay looks like pic 1
2. Take of the pcv vent line install tighten hose on pic 3
3. Place and tighten down hose on pcv return line on intake manifold
4.Install the plastic engine cover with L emblem on it
5. Run the lines to your catch can put on and tighten down
6. Install other engine bay plastics
1.Engine bay with all your plastics removed
Catch can mocked up so i can measure the length of the line needed.
2. This connects to the outlet port on the catch can
You can see a little bit of burnt on residue from the blow by
3.This connects to the hose that goes to the inlet port of the catch can
All done




Last edited by 05ls430518; 01-28-18 at 04:27 PM. Reason: Mess3d up title
Old 01-29-18, 05:16 AM
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2KHarrier
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Nice clean installation. I like the strut brace installation.
A concern that I would have, would be the physics of liquid in a confined space... The fluid will seek the lowest level, which appears to be the section of hose right below the breather hose going to the CAI. It may be that the volume of oil will be so low, that it will be carried back to the can without an issue, but it's possible that the oil, what ever the amount, may settle in those lines..

Just something to think about.
Old 01-29-18, 06:29 AM
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05ls430518
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Originally Posted by 2KHarrier
Nice clean installation. I like the strut brace installation.
A concern that I would have, would be the physics of liquid in a confined space... The fluid will seek the lowest level, which appears to be the section of hose right below the breather hose going to the CAI. It may be that the volume of oil will be so low, that it will be carried back to the can without an issue, but it's possible that the oil, what ever the amount, may settle in those lines..

Just something to think about.
Thank you I will have right ups on chassis braces, sway bars, FIGS LCA bushing/brackets, amd FIGS UCA as well, as it continues to get warmer.

Very valid point did not think of that if the oil is in the air as droplets though wouldnt it get carried to the catch can were it would get caught in the baffles or would it go through the hose and stay at the lowest point? If its gonna go to the lowest point then i will just route the hoses over that cai hose and that should solve the problem correct?
Old 01-29-18, 10:13 AM
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2KHarrier
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Originally Posted by 05ls430518
Very valid point did not think of that if the oil is in the air as droplets though wouldnt it get carried to the catch can were it would get caught in the baffles or would it go through the hose and stay at the lowest point?
I know there's a formula to figure this stuff out, but I don't know it. If the weight of a liquid is more than the speed at which it travels, it will fall at a given rate over a given distance. Sooooo you'd have to have the oil droplets moving at a rate that would ensure they go up and over the engine from the PCV valve to the catch can inside that 3/8" hose. In the other thread I suggested that you mount everything below the plane of the PCV valve and let that be the highest point in the system, then you ensure that the oil is caught in the can, as everything else would be below the PCV.

Since you already mounted the catch can, I would at this point leave it as is and monitor the system for the next 1000 miles or so. As I stated earlier, the amount of oil may be insignificant over all, and in the end you'll have a cleaner engine anyway with what you've installed.

Hope this all made sense.
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