Our gauge only shows up to 120psi, you think the oil pressure of that feed line is getting above 120psi?

i could definitely see the larger drain lines helping at high rpm but what about low? will the oil stay long enough?

Ever think about a pump system that keeps constant pressure/flow?

 

nm, just looked up the info at 928 and see there are other outlets on the headunit. Thanks!

 

i guarantee you are not getting 120psi of oil pressure. Oil pressure is based on restrictions. There isnt much in the supercharger. It squirts on bearings and drops thru the drain. In an engine sure, thats why is starts at around 100psi.

My oil feed on my turbos have a pressure sensor and they are only around 30psi cold and fall to around 25 psi hot when engine oil pressure is between 100-50psi

running 2 x 0.5" return lines is unnecessary. you seals are sh1tting the bed because the bearings are allowing the shaft to move wearing out the seals at those rpms. The only backpressure is coming from the oil in the oil pan (esp if you are trying to drain under the oil line) or crankcase pressure.

Sounds like you are bandaiding the real problem which is crankcase pressure (which fits with why you only have a problem at high rpms)

The high heat you mention could quite possibly be improper lubrication. That wears the bearings which in turn let the shaft move which wears your seals so you push oil as well.

 

^getting all technical. good read str8dum.

As long as the oil pressure is higher than crank pressure hell still get some sort of flow right? By flow i mean oil in the proper direction from the feed line through the vortech and back into the crankcase.

I dont know about just getting a few psi at the vortech. The line taps off the same point as the pressure sending unit and it is only 1 path vs 2 on your turbos.

Also, how large are your turbo feed lines? Larger lines will lower the pressure but maintain the flow right?

 

Depends. If the blower itself is fully sealed, then the only place for air being displaced by incoming oil is out the drain line with the drain oil or out the shaft seals. The oil "pressure" essentially goes to zero as it's shot out the nozzle onto the gears though. It's similar to how the CHRA of a turbo works in that once the oil bleeds out past the nozzle (or journal bearings, in the case of a turbo), the oil is no longer under pressure. It pools in the blower case or CHRA and flows by gravity out the drain hose. The air being displaced by the incoming oil does have to go somewhere or the pressure in the blower case will increase. Path of least resistance is out the drain, into the crankcase.

I can't imagine needing 2 half inch drains on that thing for a -3 sized feed line though. There's no way the drain line is the problem unless one of them is kinked.