Ditto on what everyone is saying. Pipe flow resistance is dealt with by increasing pipe diameter. I’ve been out of school too long...the flow is either proportional to the diameter or the square of the diameter. Basically you want a big diameter pipe. Bigger the better. Maybe more extreme if the flow is turbulent...again I cannot remember.

The pressure drop is also proportional to the length of the pipe. Like breathing through a garden hose as a kid underwater...tried that once. Long tubes = lower flow.

The right angle back pressure happens because of friction and inertia. You’re radically changing the direction of the flow with a right angle.

Shern - your first separator has a sintered filter in it. Depending on its porosity it’s going to create more or less restriction to the flow. The second has tiny nipples. Those don’t look good at all.

One thing I got right on my salsa jar design was big diameter tubes (same as OE breather) and no baffling. I just used a credit card to separate input and output and stuffed the bottle with Brillo. My flaw is that the tubes are long. It was hard finding a convenient place to hang the bottle.

The really fancy industrial condensers from Parker Hannifin use Brillo and giant volumes. I think they try to cool the can to encourage condensation.

This is really a bandaid on both of my cars. I may be wrong but I think I’m due for some valve stem seals on both. It has been discussed here that the turbos have more exhaust back pressure that will come back through the exhaust valve guides on tired engines. Even though the stem seals aren’t supposed to hold back blowby I suspect having fresh ones can only reduce gases that slip by the exhaust valve guides. Next valve adjustment I’ll swap mine. I have them sitting on my shelf staring at me.

Yeah that blow by meter was an education. the oil separators and drains were our competitive edge. Most of the other players in the market would have their sensor fill up with oil after a week on the dyno.

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79 300TD “Old Smokey” AKA “The Mistake” (SOLD)
82 240D stick shift 335k miles (SOLD)
82 300SD 300k miles
85 300D Turbodiesel 170k miles
97 C280 147k miles