PCV catch can install.

[RH77]

Originally Posted by Frank Lee

But probably it goes in the regular garbage.

I empty mine at oil change intervals, so the gunk gets dumped into the oil change drain pan -> taken to auto parts store when new oil/filter is bought (recycled) -> return to step one.

I change oil on 5-6 cars in the family, so throwing it in the trash wouldn't be feasible, let alone responsible.

So, I'm trying to understand how this sealed system that returns gasses directly to the intake is venting HCs:

(apologies for posting the same picture twice, but "Refer to Figure A" doesn't seem popular)...



Is there a disconnect between a commercially bought "Catch Can", and a DIY system, as pictured (and what Josh8loop has prepared)?

RH77

[Josh8loop]

Your right, in that sealed system any vapors that travel through the filter get the opportunity to be burned in the engine. Like mentioned fluid can be drained and recycled or disposed of in some other responsible manner. Mine is also sealed like the above setup, except I empty the liquid oil into my crankcase after it is filtered through Terry cloth.

[Formula413]

I don't put anything from the catch can back into the engine, I just recycle it. It's not just oil, but a mixture of whatever crap shows up in the crankcase, unburned fuel, cylinder blow by, water vapor etc. It's mostly oil but I wouldn't try to lubricate an engine with it.

[deathtrain]

chain saw oil

[Josh8loop]

Originally Posted by Formula413

I don't put anything from the catch can back into the engine, I just recycle it. It's not just oil, but a mixture of whatever crap shows up in the crankcase, unburned fuel, cylinder blow by, water vapor etc. It's mostly oil but I wouldn't try to lubricate an engine with it.

I'm not too worried. I run higher than normal temps in my TDI(205-209 F) so the water will be vaporized and flow through the CCV into the intake. Also, from what I can see the oil collected is very clean, and I strain it to make sure. remember were only talking about a little over 1 ounce per 10K miles.


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[Frank Lee]

little over 1 ounce per 10K miles

basically, a pointless exercise.

[ConnClark]

Originally Posted by Formula413

I don't put anything from the catch can back into the engine, I just recycle it. It's not just oil, but a mixture of whatever crap shows up in the crankcase, unburned fuel, cylinder blow by, water vapor etc. It's mostly oil but I wouldn't try to lubricate an engine with it.

A lot of cars that have an oil separator do drain it back into the oil pan. Any unburned fuel and water get boiled off when your engine is at its proper operating temp. So dumping it back into the crankcase does no harm.

[Josh8loop]

Originally Posted by Frank Lee

basically, a pointless exercise.

Not pointless in my case-it keeps oil from accumulating in my lower intercooler which if it accumulates too much can be sucked into the engine causing runaway or hydrolock. I love my setup, it lets me know the general health of the engine/turbo combo, and never leaves me guessing if my lower intercooler has oil accumulation!

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