Ok, so I sent my engine back after reciving low oil pressure. 10 at idle and 50 psi at 3000 rpm. And the needle bounces.

They took the engine apart to find nothing wrong. Possible theory there is some restrictor line in the turbo in or out line. Is there a such restrictor. If there is and it came out the turbo may get to much oil and lower my pressure.

Help me guys.

James

 

I don't know... but would imagine that the diameter of the line itself and location of the pickup would be used to regulate the amount of oil that goes to the turbo. Is your shop repuatble? Sounds like a shot in the dark to me.

Firestarter

 

What size oil lines are you running?&nbsp Turbo oil inlet should be -4AN MAX - you could even run a -3AN.&nbsp Outlet should be biggest as possible; a -10AN is borderline.&nbsp A -12AN is preferrable.&nbsp If you can afford bigger, get it.



-Ted

 

I have the stock lines going to and from the turbo. I have the engine builder telling me there is nothing wrong with the engine. I really don't know what is up with the pressure.

I trust the shop.

James

 

There are no restrictors in mine(2x88TII).

 

are you using the stock gauge? or aftermarket. ?

never mind just read sig could be the oil cooler lines or cooler too I guess.

 

Unless the TII turbo has an internal restrictor (which I doubt) then somewhere in the feed from the oil pump to the turbo there should be a restrictor of some sort. In the case of the Garrett turbo on my Miata the oil line feed banjo bolt has a restrictor of around 1mm (~3/64").
Turbo sleeve bearings are not really pressure fed, but effectively 'drip fed' with sufficient oil to keep the shaft lubricated. The high speed of the shaft emulsifies the oil, which then returns to the oil pan via a large diameter pipe to allow the oil/air mix to separate out.
I do not know where the restrictor is situated on the TII, but if you remove the entire pipe you should find a restrictor somewhere.

 

I will look through my parts diagram and see what i can find in the ways of a restrictor. I hope it is mentioned if there is one. I need to find out what the deal is with this engine.

And the pressure was read with a mech. oil pressure tester. So I trust its readings

James