I have been running a blocked off PCV, w/ just a breather filter (no catch can) on my turbo setup for a week now, w/ not a drop of oil out of the filter. Well I looked in my engine bay this afternoon and my freshly painted valve cover and the entire back of my block was covered in oil from blow by through the breather filter. I had some part throttle misfire issues related to bad IAT sensor that I think caused the massive amount of oil spew.

I've decided that I'm going to run both valve cover ports to a sealed catchcan (probably a cheap (~$12) air compressor moisture remover w/ the filter removed) then to a slash cut tube welded into my downpipe. This is said to generate a great vacuum level (2-8 in/hg) within the crankcase depending on load, the more vacuum at higher load, which is what you want as it helps to seal your rings, and remove the corrosive blow by gases and contaminates that can eat away your engine and sludge your oil. The only other way to do this is with expensive purpose built pumps.

This is said to give a 2-5% whp increase when done properly, and will keep your engine lasting longer.

More details on different types of PCV setups here: http://www.honda-tech.com/zerothread?id=1199935

Joel Baldridge, ASE Certified Master Technician, Audi Certified Expert Technician

Im running a catch can with both lines to the catch can then to the 3" piping between my air filter and turbo. Havent had any probs and have been using it like this for roughly a year now.

I'm talking about more than no problems, I'm talking a performance gain, and better care to your motor. If you did a slashcut tube going into your intake it will generate some vacuum under load, but not as much as the hot, expanding, exhaust gas can. You also have to clean your compressor housing and intercooler periodically using the slashcut intake evacuation method. It's the next best PCV setup to a pump or exhaust evacuation.

Joel Baldridge, ASE Certified Master Technician, Audi Certified Expert Technician

http://tinyurl.com/bqjpr

Summit has two decently priced kits available.

I'm running an exhaust crankcase evacuation system.

Joel Baldridge, ASE Certified Master Technician, Audi Certified Expert Technician

Hold on, I didn't know you had one on your 420a, I was thinking just your project 4g63. Where did you put your 2" hole on your valve cover? Can you post any pics? I was just trying to say for people who don't want to put in the time to make a system that actually creates vacuum in the crankcase, they still can significantly reduce the positive pressure by running the existing ports on their valve cover to their exhaust.

I, however, wanna do whatever it takes (unless it costs a lot of money) to get that small amount of vacuum in the crank, so I'm very intrested in your setup. Are you connecting to your downpipe from the front of the engine, or the back?

Joel Baldridge, ASE Certified Master Technician, Audi Certified Expert Technician

Agreed with what your saying and have seen this discussed before on other boards, seems like a good idea in theory but alot of work.

But what im not understanding is how this creates a horsepower increase. From what i understood this was just a preventive measure to keep your crankcase evacuated from corosive fumes and blowby.

*98 eclipse rs
*2005 srt4 (screw the warranty let the modifications begin)

Im running a straight exhaust vent system. i dont run a catch can and no pcv either.

The hp increase comes from your rings sealing better, forcing more pressure to push the piston down, instead of sneak around it. Blow-by also can froth the oil, which would increase friction on the bearings in the motor.

I'm trying to get a hold of some large silicone hose so I can finish my setup.

Joel Baldridge, ASE Certified Master Technician, Audi Certified Expert Technician

I wasn't saying that it is a waste of time. Rather, I was stating that Summit has a couple of kits that might give you a good head-start on putting this system together, but that I don't have enough firsthand knowledge to be more helpful than to simply offer a link.