Quote:
Originally Posted by phunk
Use proper size oil return lines and it doesnt matter what level the hose is connected at, it matters where the turbo drain outlet on the turbo itself sits compared to the oil level.
Its simple physics, the fluid will level itself out, so long as the hose is large enough to not cause any restriction that slows the fluids ability to level off.
There are turbo kits that drain the turbo oil back into the oil drain plug.
Also, I have my turbos draining into the Greddy oil pan. 10,000 miles later, no issues.
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Not exactly, Oil drainage on a ball bearing turbo is a lot more critical then a journal bearing one, Every factory turbo car out there have the oil lines much higher then the oil level line. Also you are forgetting the positive crank case pressure in the oil pan that could vary form one engine to the other .
Another thing you have to remember, is that the oil coming out of the turbo is not a nice liquid. It just went through a blender and comes out very frothy and aerated. So, it does not flow very well nor does it reintegrate with the liquid oil in the pan as easily. That is another reason why it is so critical that the oil return is higher than the oil level in the pan.
We had customer that did not drill the oil pan and just added a spacer without any issues . the best way is to have the oil return as high as possible . Adding the oil pan is not a bad idea to increase oil capacity witch will help improve oil temp .
Sam