dwb87

iTrader: (22)

I am getting smoke near the oil return line of my turbo. I have ventilated the crank case correctly, via Aaroncake's instructions.https://www.rx7club.com/2nd-generation-specific-1986-1992-17/crankcase-ventilation-687767/

There is less smoke than there used to be... but still some smoke. About a month ago I replaced the oil feed and oil return gaskets because it was doing it then too. BTW, it is a BNR stage 4. Is anyone else wih a BNR experiencing any smoking issues?

eriksseven

iTrader: (6)

Funny, I was just going to do a search for smoking BNR's. Not sure if you're aware--but there have been issues with the oil-seals being overwhelmed from the stock oil-pressure PSI, thereby getting bypassed and leaking like what you're talking about. It's recommended to have an oil restrictor-pellet installed to simply cut down on what the turbo itself is actually seeing.

Bryan@BNR

iTrader: (1)

If you have an upgraded oil pressure regulator, chances are you will have to put a restrictor pill in the oil feed line. You'll need a .060" restrictor.

The oil drain lines on the T2 are not sloped down very well so when you introduce dynamic seals and more oil pressure, the oil level in the turbocharger goes above piston ring gaps. So if the engine is vented properly and the restrictor is set in place, that should get the oil levels to lower in the turbocharger. Getting the level below the ring gaps will cure the smoking/leaking issue.

I am now working on a billet seal plate that turns the T4 back to a carbon seal. I just want everyone to bolt it on and not have any issues no matter what oil pressure you are running. I am doing so many turbos now its just aggrivating having pesky little problems like this pop up. But I am here if you have any questions...

Bryan@BNR
205 640 1193

Take care,
Bryan@BNR
205 640 1193

Digi7ech

iTrader: (1)

My turbo rebuilder claimed he had to remove an internal restrictor to do some cleaning.
It smoked like crazy.

I just purchased one fo the Ebay T3/4 oil feed flanges with a built in 1/8th restrictor.


It's the one on the left.
4AN threading so it works perfect for custom feed lines and it bolts directly to our turbos.

Bryan@BNR

iTrader: (1)

you have to remove the restrictor for the thrust bearing, b/c when you mediablast, the abrasives can't be removed with the restrictor in. The last thing your bearing wants is an abrasive lol.

With the restrictor in, if you are boosting the turbo 14-15 psi, you need as much oil volume to the thrust as possible. the restrictor really serves no purpost b/c the holes that feed the stock thrust bearing are around .020" times 2 or 3 depending on the bearing. The restrictor is fine for stock boost levels and maybe up to 14 with the stock bearing, but when you upgrade to a 360 thrust bearing you need to remove that restrictor or else you will starve the thrust for oil at higher boost levels.

Bryan@BNR

dwb87

iTrader: (22)

Would this .060 restrictor work?

http://cgi.ebay.com/ebaymotors/Turbo...QQcmdZViewItem

Bryan@BNR

iTrader: (1)

No it will not work w/o having to thread the oil feed part of the bearing housing. You can go to the mazda dealer and order restrictor pills. They come in FD twin turbo rubber lines that go to the wastegate and prespool actuators. They are .060" and they fit directly into the factory oil feed line. you may have to crimp the line slightly on the top and bottome to hold it into place but that works like a champ everytime and its easy to do...

cpubugs

/\ /\ /\ /\ /\ /\ /\ /\ /\ /\ /\ /\ /\ /\ /\ /\ /\ /\ /\ /\ /\ /\ /\ /\ /\ /\ /\ /\ /\ /\ /\ /\ /\ /\ /\ /\ /\


And that folks is vendor support! We should accept nothing less.

Thanks Bryan

CDNFC3s

yeah I'm experiencing smoking issues on a BNR Stage 4 turbo. I'm running a .060 restrictor in the feed and a catch can that is properly routed and I'm still getting smoking out the tail and from the center section of the turbo , from the sealing area (ring gaps I'm assuming) closest to the turbine. The turbo's mechanicals seem to be in excellent shape, but the turbo is leaking oil...
I'm sending Bryan mail and trying to reach him by phone, but I've had no response. Has anyone running a Stage 4 gone back to the stock carbon seal or seen the billet seal plate Bryan made reference to in this thread?

initial D is REAL!

for my restrictor, I took a thin alluminum plate the shape of the flange, drilled a small hole in the middle. costed me 25 cents and 15 -20 minutes of my time

On another note, You turbo is burning oil near the oil return line? Maybe there is a gasket leak. My turbo burns oil, but through the exhaust

Osirus9

iTrader: (10)

I'm having the exact same problem with my stage 4. I did what initial D is REAL! did, and made my own restrictor out of a piece of steel sheet metal. I then drilled a 1/16" hole in the middle (.0625") and put it right on top of the turbo.

however, when I went to start the car again it was just as smokey as ever, and I looked under the car while it was running and could actually SEE oil dripping from the bottom of the center section of the turbo, just like it was doing before I put the restrictor on.

i suppose what I want to know is, are the internal oil seals on my turbo toasted? or should I try a smaller restrictor?

Osirus9

iTrader: (10)

I just swapped my extra s4 stock turbo on tonight, and the smoke went away instantly. There is now absolutely no doubt that the stage 4 turbo is leaking oil.

Digi7ech

iTrader: (1)

^Did you buy the turbo from BNR or was this a private sale?

How many miles were on it?

You sure it's not a leak from the feed or drain lines?

Osirus9

iTrader: (10)

its an almost brand new turbo from BNR. I had him build it for me. I contacted him today, and he said he would ship me an FD oil restrictor for free. I hope it works!

I made another thread not long ago with pics of the oil coming from the turbo, it is the best proof I can give concerning the fact that oil is in fact coming from the turbo, besides the fact that when I swapped to a different turbo the smoke noticeable decreased (the turbo i swapped to is known to be bad, i swapped it on just to be sure) that thread can be found Here

apparently the restrictor i made was not small enough, at .0625", and he said that a .06" restrictor should make a difference.

My oil pressure like to sit at about 60lbs at idle, and before the rebuild it would sit at about 30, then rise to 60 when I gave it some gas. Does 60 seem abnormally high for oil pressure? all the oil control for this engine is stock and i'm using 10-w40 oil.