New winter new turbo build
#181
The breather is there to allow the oil to drain in to the reservoir after the car has been shut off. If it wasn't there, the oil would just sit inside the bearing housing of the turbo. If you leave it sitting it eventually leaks past the seals in to the compressor housing. Doesn't damage the seals at all, it just seeps through overnigh. If the breather wasn't there, the air that the oil displases has no place to go.
#184
The oil does drain to a degree, keep in mind that the air has to go somewhere. With the pump located between the turbo and engine it creates a perfect seel. The air has nowhere to go.
Last edited by BoostedProbe; 12-26-2009 at 09:10 AM.
#186
I am hoping that Don (MI 35th) will have some numbers by end of January for all of us. His motor is build and will be tuned by Hal @IP, the Precision 6262 should provide us with some very good numbers.
I am looking in to it. I have a few more ideas for the car too, so will see how it all goes.
Last edited by BoostedProbe; 12-26-2009 at 02:54 PM.
#190
I get PM's ofter people asking bout "how this works, how that works"...ect. I am more than happy to explain. Some questions make me thing "how does this guy put his pants on in the morning" but that is ok, we all have to start somewhere.
No, not at all. The probem occurs when the engine/pump have been shut down and the oil has no place to go. I actually tested how much vacuum the pump creates by putting a vacuum/boost gauge between the turbo drain and scavenge pump inlet. With the car running I had 15hg, (-15 on gauge) and with the car running it was about 10hg of vacuum.
This picture was take while I was trying to figure out why I have oil in the compressor hosing (no reservoir at this time). At first I figured that there was something wrong with the pump, the vacuum test eliminated that theory. All that was left is oil sittin in the turbo and no place to go with an air lock. That is when tig488 suggested a reservoir, and it made perfect sense.
Last edited by BoostedProbe; 12-27-2009 at 07:13 AM.
#196
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it's not a hard concept. The breather also allows trapped air out of the resevour so oil can drain from the turbo down into the res. The when the pump isn't running it's a sealed tube so the air in the res has to go somewhere. If there isn't a vent then the air would stay in the res and the oil that was in the turbo wouldn't be able to drain down.
It's similar to the reason those cat and dog watering dishes work to only fill the outside dish so high yet keep a large quantity of water in the res.
It's similar to the reason those cat and dog watering dishes work to only fill the outside dish so high yet keep a large quantity of water in the res.
#197
After screwing around with some ideas for the turbo oil return lines I decided to do the proper way. -an fitting and stainless braid lines, goes something like this:
The two oil lines (supply and drain) will run here. Both are about 6" away from the exhaust and there is no need to heat wrap:
The oil drain will go to a JWT oil pan spacer, and it will be tapped for a -6 an line, right beside the oil filter. See picture below:
Also picked up a bunch of quick connect fittings and 100' of hose. These will be used for wastegate and BOV plumbing. They are very easy/quick to disconect/connect. All reusable and good for pressure (150psi) and vacuum.
No cheep rubber hoses here.
The two oil lines (supply and drain) will run here. Both are about 6" away from the exhaust and there is no need to heat wrap:
The oil drain will go to a JWT oil pan spacer, and it will be tapped for a -6 an line, right beside the oil filter. See picture below:
Also picked up a bunch of quick connect fittings and 100' of hose. These will be used for wastegate and BOV plumbing. They are very easy/quick to disconect/connect. All reusable and good for pressure (150psi) and vacuum.
No cheep rubber hoses here.
Last edited by BoostedProbe; 12-28-2009 at 03:55 PM.