Idea for turbo inlet oil pressure reduction

[nikp]

Ok, i still need to fit something to reduce the oil pressure going to my ball bearing turbo. Now, I think i may have a solution, or at least an idea for doing it, but wasn\'t sure of one aspect of it, so wanted to run it by you clever people.

I have found something (Lets call it a metal \'sleave\') that fits into my oil line with the correct size for the oil to run through inside it. However, this sleave will be free to move about, to an extent, and wanted to make sure this would be ok. I have drawn a diagram below:

Basically, the sleave will be free to move from right to left up to the point where the metal supply pipe turns a corner. It can\'s get past this point. On the other side it can\'t get past the end of the male/male connector due to the braided hose not allowing it to pass. The oil flow runs from right to left in the picture. My question is, will it be ok for the sleave to move about like this, or should i find a way of making it not moveable? (The green arrow shows it\'s possible to move in both directions). I figure since the oil flow runs right to left, it won;t actually move much anyway, but thought it best to check.

[TwistedHumour]

I’m confused, how is it going to reduce pressure?

Wouldn’t it increase it in the same way as if you were to put a thin nozzle on the end of a garden hose (as opposed to no nozzle)?

[nikp]

velocity of flow is increased, pressure is reduced.

[CraigN]

Can i ask why you need to do so ?

On my cosworth the fitting on my turbo i had to drill out by 1mm to increase flow when i fitted a hybrid T38 to it. I did this on the adivice of my mapper and assumed it was jsut to increase the flow. Never though about pressure.

if you were to fit say an inline mini oil filter in your oil feed pipe it will act like a collector inline and help reduce pressure slightly.

[nikp]

I need to do this because the oil pressure in the turbo is too high as standard. Even the Garret web site says that the GT turbos don\'t need very much oil pressure. The oil is being blown out of the turbo and into the inlet tract at the moment.

[marco]

W.R.T to the sleeve moving about in the pipe, what are the two parts made out of? Movement between the two will cause wear, even if it is moving in only one direction, pressurising the line will force the sleeve into the bend of the pipe. This wearing will inevitably cause debris to be put into the oil line which will then flow in the oil down stream to the turbo. How much of a problem this will be depends upon the materials in question (so what kind of wear and size of particles produced) and the tolerances down stream in the turbo. My gut feeling is that this should be ok, but then again it isn’t my engine.

I would write why this will cause a loss in pressure, but every time I start writing I seem to write an epic that gets quite complicated and far too long! If you are really interested then give me a bit and I will try to write down something that is succinct.

Adrian

[nikp]

Can i ask why you need to do so ?

On my cosworth the fitting on my turbo i had to drill out by 1mm to increase flow when i fitted a hybrid T38 to it. I did this on the adivice of my mapper and assumed it was jsut to increase the flow. Never though about pressure.

if you were to fit say an inline mini oil filter in your oil feed pipe it will act like a collector inline and help reduce pressure slightly.

Here, read this. Garrett say themselves that ball bearing turbos require less oil.
http://www.turbobygarrett.com/turbobygarrett/tech_center/turbo_tech101.html?#t101_5