Originally posted by KLHAMMETT
is there any rule of thumb on how much oil your turbo should be fed?
Can it be fed to much oil? so is that it cannot return it fast enough and push it past the ring seal?
This would be on a GN 3.8 motor with factory feed and returns.
Thanks Otto
First of all, to try and answer your question, basically no, it cannot be fed too much.
IMHO, trying to restrict the flow anymore would be a disaster. Remember, that shaft is spinning uppwards of 100,000+rpm at full boogy. It needs and can use all the oil you can give it.
In essence, the return line and associated plumbing (and the center section drain provisions make it virtually impossible to feed too much oil into the center section.
The supply elbow (on the stock type feed system) is a little smaller than the line that feeds the oil to the turbo. Contrast that to the nearly 3/4" hole exiting the turbo (and even larger drain line), and you can see that the center section would NEVER be under pressure, just a lot of oil. Basically it can drain much faster than it can be fed.
I also did the exact same experiment that
turbodave231 did and yes, there is a LOT of oil coming back down the turbo drain tube (I looped a piece of hose off the supply line right into the still mounted turbo drain tube), but not nearly enough to consider it not large enough.
HTH.