Even with a quality check valve this set up simply does not work. The exhaust simply has too much back pressure... for a drag set up that has the exhaust out the front bumper ect.. it would be fine....

I learnt the hard way... Thought it was a great idea and that it would create great vacuum but ran into nothing but problems
Right now im VTA but contimplating on installing an electric vacuum pump and going to a closed system again.

 

http://www.boombaracing.com/cv.html

This is what I used

 

Those are nifty looking.

 

Not that it matters, but I have data logged back pressure ~1.0" after the turbo when running 40psi of boost and see less than 1psi with my 3.5" exhaust.

You have to run some type of venturi port that extends into the exhaust stream to create vacuum. With almost the complete lack of pressure, at least in my system, and the use of a venturi port I doubt a check valve is even required.



I will test the system and report the data in the next few weeks. I plan to data log pressure and let the data decide. I did just purchase the HAL oil cap breather so I plan to vent that to the exhaust scavenge through a closed can and will post pictures soon once I finish fabrication.

 

I have already run that... it was a mess... By no means am I saying take my word, but this was my set up...

https://fbcdn-sphotos-d-a.akamaihd.n...44765321_n.jpg

 

Thank you for sharing the pictures and it would appear you had the correct pieces to make it work. Perhaps I should start by hooking up a hose to the port and seeing what type of reading I get from my vacuum/pressure gauge. I should be able to rig up something over the weekend to take preliminary readings.

 

can i use a check valve instead of a pcv if im not using a catch can for that side of the vc.

 

Bumping this up. Where can I get a good quality check valve that accepts 1/2" ID tubing and doesnt cost $40 bucks like the ones made by Boomba Racing? Also just to confirm, Im running two catch cans and am still using my PCV. Do I only need 1 check valve in the line that runs from my IM to the catch can that way the can will not be pressurized?

 

Better off just running a line pre turbo and that will suck everything out.

 

why was it a mess, this is what i want to do

 

Simply did not work... Oil ended up being highly ingested
Just lucky I didn't blow my new motor.
Still not sure where or why this didn't work, but when I removed the line from the exhaust and left it open to atmosphere the car ran unbelievably better and oil consumption stopped instantly
I plan on running an electric vacuum pump instead now

 

I was able to hook up a line to the exhaust scavenge venturi just to understand what happens at idle. I attached a ~3ft aluminum tube and there is minor flow out of the tube so it will require a one way valve or it will send pressure to the crankcase. When I revved the engine to 3k rpm the flow from the tube disappeared, but I did not have a gauge to measure pressure. I have started fabricating my new catch can and purchased the a NAPA 2-29000 exhaust scavenge valve. I will post pictures in my thread and report back my results here.

 

Interested to see how that napa part plumbs in.

What if the scavenge tube had significant more convergent angle?

 

goign to run an extended dump breather line under the car then

 

Sorry some how i unsub'd just came across the thread... Themuscle car guys have tried
Most valves and recommend a napa part... Its an exhaust check valve... It works great. Under heavy boost i actually start pulling large amount of oil vapor out which bothers me. I'm gonna redesign the system when i get time. I wish i had mrfreds resources to log this thing for everyone...

http://m.napaonline.com/parts/PartsD...001_0174318545

I feel the fitting size is a bit large in my opinion but i was following advice rather then creating my own system so i went with it. If you cant get one with a 5/16-3/8s inlet it would work a lot better.

Just noticed you are running a 5/8s line not a 5/16 like me. This fitting will probably work great for you. Run your breather to a catch can... Baffled would be best... Then to the exhaust to minimize oil vapor... Should work great

Like i said mine pulls oil under heavy boost. Verified by dosconnecting it and it stopped smoking... But so lil it never effected my oil level... Just enough to make a visual haze out the pipe.
Probably what the guy above mentioned as a mess...

Ps if you have more the 1.25psi back pressure your exhaust is busted... Thats the highest allowable by any manufacture in the world... With a cat mind you. If you attempt this with a cat it will melt down and clog your exhaust pipe... The average car should sit around 0 pre cat pressure and 0 thru -4/5 without a cat on a well flowing exhaust.