DIY - Catch can under $25

There are plenty of ways to make your own one of these, After all they are a simple thing. But here is one i have made out of poly pipe with bits from Bunnings.

So i have an Isusu 4jb1-t which had a lot of blow by (apparently they all do) and having this flow freely out of the engine is important to keep crankcase pressure down and minimize oil leaks. The problem is a lot of coil vapor comes with it and needs to be removed from the air before allowing it to recirculate back into the intake.

The top section of your catch can should incorporate designs to baffle or diffuse and catch the oil particles, group them up, making them heavy enough to drop form suspension and fall to the reservoir of the catch can. the oil particles while flowing with the air, don't like changing direction. passing it though something like steel wool will cause the particles to land on the surface of the material and run down. The flow of air should push the oil that is collecting onto the steel wool, down into the catch can. Into an open area where air velocity will drop and pressure increase, allowing the oil to drip down and not be carried into the output. This is where you will need a baffle to force the air to travel down into the can and drop the oil, before turning back up and exiting the can.

I used the proper PVC clue and some strong oil safe adhesive silicone along with super glue to bond it all together. The PVC glue only works on PVC so don't try and put it on the plastic fittings. All the fittings come form the garden section in Bunnings.
The only extra thing is the sight/level window. I had some 3mm perspex sitting around. I just heated it up and formed it into the correct shape, and glued it on with the adhesive silicone. The piece of poly pipe in the half moon shape over it, is to cause a contrast when you look though the window, so you can see if there is oil there without a light.

The gauze was a "mozzie" stopper i got from the polypipe isle and cut down to make fit.

and the sell wool is stainless and comes from coles. I think it was $1?

I used a small hole saw to cut the holes for the fittings and pushed/screwed them into place. Then put a good bead of superglue on each side. allowed it to dry. Then put a layer of adhesive silicone over it.
I used a hot knife to cut down the fittings that protruded too far into the can.
The drain fitting on the bottom, i put 2 slices on it to stop 10 mm of oil from getting stuck in the can.

I cut the PVC with a hacksaw (18 teeth per inch blade i think i used) and used a piece of a4, wrapped around the pipe and traced with a texter to get the pipe cut strait.

Only the highlighted bits in this receipt i used on the catch can. I grabbed a whole bunch of fittings for other projects as well.

This fitting for draining the caught oil out.

I did this pit last, that is not hot glue! the silicone i was using is a dow corning product and is clear. While this was still wet i put a beat right in the corner right around, then a coat of pvc glue on the top 1cm of the pipe and put the lid on. The PVC glue sticks it and the bead of silicone was just in case as a seal.