What Is The Purpose Of These Oil Seperators?

Bullitt95 said:

An oil separator will actually help in this situation by preventing oil from getting blown into the intake, but it should only be seen as a bandaid though.

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That's not exactly true. There are bone stock boosted cars that come from the factory with oil separators on them already. They're intended to help prevent oil getting into the intake through the PCV by catching that oil mist kicked up by the crank and/or cam(s). That's a different circumstance than oil consumption created by excessive blow-by or, rod pin intersection, or oil entering the combustion chamber through the bottom of the piston ring. For the latter 2, no oil separator is going help.

The only portion that oil separators will help with is the oil that's picked up by vacuum on it's way to the intake.

There's other things that someone can do instead of installing a separator. One is to increase the size/volume of the PCV to slow velocity (picking up less oil mist), or installing a windage tray to reduce the amount of atomized oil particles in the crank case to begin with.

Do a compression and leak down test. Something could be amiss.

--or--


You could be suffering the same problem that a lot folks run into when increasing power in these motors. Too small of a PCV. The oil gets kicked up by the crank, the port for the PCV is so small that the air velocity running through it to the intake is picking up a lot of that oil mist and dumping it in the plenum.

There's a couple of things you can do. Run a separator to reduce the oil getting to the intake or increase the size of the PCV to slow down the air velocity. You do the latter by creating a new path of travel from the driver side valve cover to the intake.

Doubling the volume of the system will cause the velocity to slow down and makes it pick up less of the oil mist.

Do you have a screen installed under your PCV? You can pick up an excessive amount by not having that installed as well.

I went with two methods. I double the size of my PCV system and installed separators on both sides. Granted, I don't pick up much oil in the catchers but every little bit that I do, helps.

a91what said:

I am about to do surgery on her again, she's getting a set of cnc'd gt40 planted on top of her. I dont burn any oil and i have never had to add any oil between changes, i just have an uncanny amount of oil in the plenum. I run a amsoil 5w30 full synthetic.
When i get her torn apart ill look for any scarring or damage on the cylinder walls. Hopefully all is good, but ive been lookin for an excuse to start over a 427 would work out nicely between the fenders.
Ill try a larger pcv i do run the screen under the pcv. thanks

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I seriously doubt that you have an engine problem. You're having the same problem I had once I got the new and improved motor all put together and tried venting all those extra crank case gasses through the same small hole that it went through when the motor was putting down just 190HP to the wheels.