johnrx2

Im tracking down a oil smoke issue im having. Car on 1st start of daysmokes until egts are hot enough to burn off oil. Does. Not go away if it warms up at idle even fully warm. After driven its good for the restof the day. The turbo is a gt 40 non ball bearning. 503 whp e85. I just got the car last month i love it but the smoke driving me nutz. Please look at the pic it is the charge pipe coupler coming off turbo
Any input would b greatly appreciated
Thanks
John

johnrx2

Also notice a high pitch chatter noise from turbo while cold just going out of vaccum. Once warm its gone though and everything sounds normal. Its been 6 or 7 years since iv had a 7 and used to let idle warm up b4 driving. Today i just gotin it and drove out of my nieghborhood real quick b4 it started cleared up w in 2 minutes of driving slightly getting out of vac till warm then hammer it. Hopefully turbo not worn out. Should only have 5000 miles

bufferovrflo

iTrader: (7)

Curious, do you have an oil catch can, if so how is it routed? Could be pressurizing the crankcase. Also your oil feed line to the turbo, what size is it and any restrictor?

johnrx2

The catch can runs from oil filler neck tube to can which is vented to atmosphere. 93 rew block. Isthere another place i could run another line? Not sure about restrictor i asked the previous owner he does not know.

johnrx2

Drove car earlier and it sat for 4 or 5 hrs and i got some smoke again not as bad as the first drive of day. Did make some 20 psi pulls car runs great besides anoyying smoke issue.

bufferovrflo

iTrader: (7)

You should be fine on the catch can then. It might be the turbo seals, if so it could be you're feeding too much oil pressure to the turbo or the drain isnt large enough.

jetlude

iTrader: (9)

Could be a restrictor issue. Since oil pressure will be very high at start up and will fall as the engine warms.

silverTRD

iTrader: (36)

Could be a restrictor issue. You'll need to pull the feed line and either pull the restrictor to read the size on the side or just measure the hole. It's non bb so it will be a good size one.

Could be a drain issue. It needs to be large, -10 and as straight as possible. Have a pic?

For the catch can, you can use the secondary oil drain port for an additional line. Its supposed to help a lot because it is capable of catching the oil from either side of the motor.

johnrx2

I believe the drain line is -10. Ill have to pull the oil feed line and see what the previous owner has in there. What would the correct size restrictor be? .035. .065?

Also silvertrd where is the secondary. Oil drain line located.

Shainiac

iTrader: (7)

Non-ball bearing shouldn't necessarily need a restrictor.

johnrx2

If not would it b the seals then. Would you say from the pic that the turbo is cause of smoke? I would much rather have to freshen up the turbo than the motor.
As far as the catch can if someone can tell me where the rear oil drain is and i will add a line to that 1st to b sure crankcase ventilation is not the problem

RobertC

iTrader: (1)

If he is talking about the secondary drain port, if you're standing on the passenger's side of the car and looking at the UIM, basically look straight down from the left most bolt on the UIM where it connects to the LIM and you should see a block off plate at the bottom of the motor itself, iirc it's just to the left of the LIM its pretty easy to get to from underneath the car.

RobertC

iTrader: (1)

You can see the secondary drain port with a block off plate to the left of the exhaust manifold. I actually setup my catch can to drain to that port.

silverTRD

iTrader: (36)

Correct. You can just drill a hole in your block off plate and weld a tube on that. I guess you could tap it and run an lines as well.

Non bb turbos don't necessarily need a restrictor but some benefit from it fir smoking issues. I believe .065 is a good place to start for a journal bearing.

RobertC

iTrader: (1)

Do you have a picture of any oil build up any where else along the intake piping and have you had a chance to test the wheel for any excess movement? My old twins went out and the secondary intake side o ring failed and I was spitting oil out of my secondary relief valve and blow off valve all over my intercooler. There was a side effect of some smoke when it would make it's way all the way into the engine.

johnrx2

No other pics yet. I did talk to a guy from atp turbo today. I was calling to ask about the correct restrictor for the gt 40. He said most of the time its not the turbo seals but its a forced leak due to high crankcase pressures. Especially with the fd rx7. He recommened i add the rear breather before i add a restrictor.he described it like if the turbo is trying to drain oil to return line but the pressure is pushing back the opposite direction causing a forced leak on the seals. Once i take care of that then add a restrictor if needed.
On my old fc w s300 turbo i did not even run a catch can i believe i just vented it near the oil cap. That was a s5 t2 motor

I found a write up by forum member Damien. About his catch can set up. Though my can is different it even shows part numbers he used. So i will order parts tonight
Thanks guys for the replys

Is there a big difference. In crankcase pressure. Between fc and fd blocks

bufferovrflo

iTrader: (7)

I just did fix this exact thing on mine, S366 running -4 feed with catch can off the neck venting to atmosphere. The fix was reducing to -3AN feed and all problems went away.

johnrx2

Were you having smoke issue like mine? I believe the feed i have is a 4 an. Would a restrictor be tge same effect as going down to a 3 an?

bufferovrflo

iTrader: (7)

I had slight puddling on the inlet of my compressor housing and smoking from the turbine housing where the oil seeped from the center cartridge. I didn't want to play the guessing game messing with oil jet sizes or restrictors so just jumped down to the -3AN as recommended then it was almost instantly cured (almost cause the oil had to burn off the turbine still). Hope that helps. GL

johnrx2

Yes thank you for reply. I ordered all the line and fittings to add the second breather for engine. If still smokes it will b gettin restrictor or i will try the 3 an feed.

BezRx7

I replied to your other thread. Besides all the suggestions for the new oil feed (-3) and new restrictor, I would also suggest adding a vacuum source to the catch can with one way valves. Helped for me. I'm still to do the new line and restrictor.

johnrx2

A vacuum Line? Would that make a difference. Since its vented to open atmosphere. I got my braided line and an fittings in mail today so i will add my second breather line this weekend. What would vacuum do for catch can?
Thanks

BezRx7

vacuum sucks the oil vapor out the crank case and into the intake, i have read that increased oil pressure and/or no vacuum source leads to excessive oil pressure and oil getting past the oil control rings

lOOkatme

iTrader: (19)

I have a catch tank and the catch tank attached to my intake. I don't have any smoking problems at all. This is how the newer rx7's do their routing. I like how the stock set up deals with a lot of this stuff that a lot of people just dismiss.

I run my catch tank up hill from the oil filler neck (I have a baffle in the oil filler neck) and I catch nothing in my catch tank. works like a charm. I am running -4an line from my filler neck to catch tank and catch tank to intake tube.

johnrx2

Is your catch tank vented to atmosphere? Mine is just open w a filter so would that just be a vacuum leak then?