Those of you with catch cans and full emissions delete.
 

Are you running ventless using vac to draw vapors into the can or useing a vented can that just accumulates via pressure from wherever?

I think this car being a rotary would benefit from having all those oil vapors and blowby stuffs being sucked back into the engine.

Thoughts?

I am using a vented can that accumulates moisture/oil over time...

vented is much more common. it really doesn't matter much either way for most applications. The vapors mostly accumulate under high load, where there is sufficient crankcase pressure to force them out anyway. Mazda didn't even run PCV valves on all 95 and later Rx-7's.

I run mine vented, with a hose coming from the middle iron and from the oil filler. the PCV valve has been eliminated.

That answers it. I suppose i could t everything else i need vented off of one line. Evap and i think there's one more thing i'm missing but thank you.

Yeah, my pvc valve is sitting in one of the many overflowing boxes of "parts i dont need" from my fc. I should weight them all one day and see how much i saved!


I suppose i will run non-vented/vac pull if it really doesn't matter. I'm n/a right now. I'm assuming boost pressure on a vac based setup isn't all that productive? Logically it makes sense to run vented with boost.

I'm not sure what kind of plumbing you are describing, but on a day-to-day basis there are a lot of ways to handle crankcase ventilation. Most of them will get the job done in most applications. Just don't mistakenly cap off the breather ports on the engine. Then you will blow out your dipstick. You should see how many V8s run only small breather filters on the valve cover for crankcase ventilation. on a turbo car you usually need a catch can (unless you are recirculating the blowby like stock) because they tend to produce more vapors/oil and you don't want it making a mess in your engine bay.

My system is set up such that when the crankcase is under pressure (engine is under boost) it blows into the catch can. Then when the manifold is under vacuum, the manifold draws through the catch can, through the lower middle iron nipple, the out of the filler neck nipple into the intake.