Oil return Check valve

[okm12346]

I have seen the picture somewhere but i can't remember where. All i know it was on a race setup.

Anyway, anyone have seen this? What do you think of 10AN or 12AN check valve in the oil return line idea?

 

[99gst_racer]

What's the point of a check valve on a turbo drain line?

 

[jjrock5]

What's the point of a check valve on a turbo drain line?

Maybe he doesn't want his oil to defy gravity and move from the oil pan up into his turbo??

 

[SOADweskey]

On a tired engine or on a race engine running very high boost the crank case will become pressurized and this pressure can prevent oil from using gravity to drain down the line as the pressure exerts more force than gravity. However in my mind this same problem would prevent the check valve from opening until the pressure behind it is greater than that of the crank case and that might force oil out the seals in the turbo.