How well does it work and what is the proper way to set up this type of crankcase evacuation system?

When you pull vacuum on the crankcase, do you have to also let fresh air in from somewhere, or is that not necessary?

 

Are you referring to running a vacuum pump?

 

Also what is your purpose in doing this?

 

Using a venturi in the exhaust to scavenge the crankcase for better ring seal/moisture evaporation.

 

I think you would put breathers on both valve covers, then check valves on the lines going to the exhaust. I've heard of people using ford escort air injection pumps, electric I think, to do the same thing without using the exhaust.

 

I was thinking you could put breathers on the valve covers and use check valves to keep air from entering the crankcase. They would be there to make sure you didn't build positive pressure. I think it is good to have vacuum, you have a constant flow past the rings so you probably won't get tons of vacuum but I think some is good.

 

Not interested in running an electric pump setup, also not interested in running just a breather. I've heard two good places for turbo applications to pull crankcase vacuum: 1) just in front of the turbo in the intake pipe, and 2) using a scavenging system in the exhaust. I'm reading a thread that parish started over on tech right now, seems as though he had good luck with the venturi/scavenging type PCV setup.

https://ls1tech.com/forums/showthread.php?t=524125

Here is the kit I'm looking at, made by Moroso. Summit P/N MOR-25900.

 

Vacuum is good, not too much though. After doing some reading it also looks like it is important to have a filtered fresh air source as well to help clean out some of the crankcase fumes. I'm trying to figure out how to build a completely closed PCV system that will work well with the turbo setup and eliminate the possibility of sucking oil into the intake manifold.

 

If you use the inlet of the turbo you will potentially draw oil into the intake. If it works out on the exhaust side that seems like the way to go.

 

If you ran one small hose with a check valve to the inlet of the turbo you would have filtered air for the crankcase. The check valve would allow flow into the crankcase only and prevent oil/air from getting pulled through the turbo.