OK, I have been wanting to do something different with my PCV system for a while. Currently I have a small K&N filter on the drivers side with a pcv from the pax side to the intake manifold. My car has some blowby (or possibly a leaky turbo seal) so I get a puff of smoke every time I let off the gas (I think that is when it happens). I don't want that crap getting into my cylinders any longer so I am thinking of venting everything to the exhaust.

Can anyone see a problem with this setup:

Keep my drivers side intake K&N filter in place. Cap off the hole in the intake manifold. Run a hose from the pcv valve under the car to the exhaust downstream of my downpipe. Cut an angle on a small pipe and weld it at an angle a little downstream if possible of the WBO2 bung (not much room to work with):
http://ww2.lightweightmiata.com:8080...exhaust06a.jpg

Would my hose melt (probably very small heater hose) if my small pipe was only 2-3" long? I would probably "repack" my cam baffles or put a small catch can somewhere to keep the oil from exiting the exhaust if it became a problem.

 

Check out this link, http://www.honda-tech.com/zerothread?id=1199935
There is a moroso part in there for doing the exhaust slashcut/venturi system. It incorporates oneway valves.

I'd suggest if you want to go that route... run a catchcan in between. Use the slashcut to pull vacuum, and the catchan to accumulate the junk from the breather.

 

The angle and position of the pipe have to be just right to achieve a a strong ventruri effect. I don't think it's as simple as sticking a tube into the exhaust stream. If you have a cat oil contamination could lead to an early death.

Is it possible that the puff you are seeing is actually the result of a very rich AFR? While doing intial tuning, I was creating a nice black cloud running 10.5:1 AFR.

 

I am a novice welder so any mistake I make with the position is just an excuse to play with my mig welder again.

Yes, it could be fuel BUT my A/F looked good the last time I checked. I'm trying to use the exhaust vacuum route to eliminate all possibilities on what the smoke is.

 

blue smoke is oil....

Means normally (non turbo) that the valve guides are out off specs...(only blue when lifting the trottle)

All the time blue: deffect turbo or piston rings.

To check: remove downpipe look for oil. (turbo deffect)
Check intake (oil on butterfly valve means turbo too.)

Replace pvc valve (just 2 b sure)