Fiat500 turbocharger .48. Would like to use duals for future rear-mount twin turbo'd mustang. Cool-factor mainly.

So i have this working turbocharger that i got for only $35. Pretty much something to play with and learn on.
I noticed it was tough to blow in to with a hose and fitting. So i drilled the built-in oil restrictors inside the feed and drain for considerably more flow.

I guess what i'm wondering is since the oil can flow more free now, the oil should be able to go uphill after the oil-drain ?
Consider it will no longer be on a Fiat and will be on a 3.8 Mustang now so it should have the pressure to fill up the turbos oil galley and send the oil back to the engine.

Yes ?

 

No drain can go uphill unless pumped. By drilling the the restrictor you actually allow more volume to get to the bearings, and possibly have more oil passing through to the drain, requiring even better drainage.

 

But if there was no turbo, just a long oil line, the oil would be able to travel up hill , right ?

 

Yes, but it would be pumped up hill under pressure. The bearings in the turbo are the pressure break...... oil pressure on one side, none on the other. The oil at that point needs to gravity, or be pumped back to the pan. The oil would eventually be pushed back to the pan, but the seals leak as the low pressure side of the center section fills with oil (oil exits the bearings as basically oil foam).

 

I was looking at this turbo diagram ..
and i think i drilled straight through the oil passage just before the shaft. That explains why i could blow through it better than before.
It should get a good consistent flow and pressure(1/4" i.d. line in). If anything i will need to restrict the drain tube to keep some oil backed up in there(1/2" i.d. line out).
This will be interesting. I'll be sure to see if, and how much oil comes out the end of the return line and what it looks like.

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If you drilled through the horizontal passage in the pic you have basically destroyed your turbo.

 

You dont want to do this. It will cause the oil to get past the seals and you will end up with oil contamination in the intake and exhaust of the turbo.

Its a pretty simple system the doesnt need re-engineering.
1. feed the bearings with oil.
2. allow oil to drain unrestricted.

 

Nobody is perfect but It seems that you learned something the hard way.