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Originally Posted by 99gst_racer
In a nutshell, I no longer want to run a PCV valve. I don't want to take the chance of it being a boost leak. But therein lyes the problem. I still would like some sort of negative pressure (vacuum) source to help pull (evacuate) the crankcase pressure and all of the blow-by in there. I don't feel it will adequately evacuate itself without the help of a pressure source on the other side.
Here is how I have mine set-up currently:
This is a decent set-up, IMO. It is about as good as it can get, without having that negative pressure source that I am looking for.
I would rather not use the intake manifold for a vacuum source, unless I could find a one-way check valve (PCV valve) that was guaranteed not to leak on turbocharged applications. And I don't feel the intake tube will supply enough vacuum to make much of a difference in the evacuation process.
So, this leads me to my next idea. To possibly use the exhaust to evacuate the crankcase.
What do you guys think of this set-up?
My largest concern is oil contamination. I did a compression test yesterday, and the results were very pleasing. But I am still getting a large amount of blow-by. I could only imagine how much of that doesn't make it's way out of the crankcase and contaminates my engine oil. That is my concern for a negative pressure source for the crankcase. |
Your exhaust system is at positive pressure, so this would not work... even though after the turbo it is not at high positive pressure, it is still positive.
Also, the point of a PCV system is to have fresh airflow into the crank case, then the fresh air picks up the water vapor and other blowby gunk and is sucked out through the PCV valve into the intake manifold. If you do not have a fresh air source you don't suck anything out.
Think of it this way, if you take a glass beer bottle tilt it back and draw a vacuum in it with your mouth while drinking the beer eventualy flow stops because air can not get into the bottle.... but if you had a valve on the bottom of the beer bottle to let air in you would have constant flow of beer and life would be good
Keith
