ferrari360man

iTrader: (1)

So I got a new forged 347, that is broken in now, and im having a bit of a oil burning issue. I bought a used t76 turbonetics journal bearing turbo that I am running. I have a -4an feed and a -10an return to the oil pan. The car when in neutral can be reved to the moon and it will NOT smoke. I can drive it around all day and hit a little boost and it will NOT smoke, but when I lay into it and hold through 3 and 4th full throttle and reach max boost, when I let off the gas, I get clouds and clouds of oil smoke. So Its clearly related to higher boost for some reason. Now this being a new engine, I would think everything should be all good. Even my heads were all worked over. I DO have the revExtreme dual valve catch can setup, and I have removed all the lined to the catch can and the lines going to intake etc, and found no signs of oil in those lines. So it being a pcv issue seems to be un likely.
Any ideas ? Is this simply my turbo? I am hitting about 11 psi max boost, and thats usually when it smokes

droksformula

iTrader: (18)

Sounds like the turbo needs to be refreshed.

Fbodyjunkie06

iTrader: (10)

Bad journal bearing maybe....how is the turbo clocked? Maybe you aren't getting adequate drain back after WOT and oil is entering the exhaust.

ferrari360man

iTrader: (1)

Well, The turbo is mounted in the front of the car where a centri supercharger would go. Its hinson supercars turbo kit.... I have checked all my pcv fittings, and found NO oil residue anywhere. I even pulled the charge pipe off the turbo and it looks clean of oil as well.

Fbodyjunkie06

iTrader: (10)

If the turbo isn't clocked in a certain posistion then it doesn't matter what size drain back line you have to the pan it will still build up in the housing and then when it gets hot enough at WOT it burns it off.

ferrari360man

iTrader: (1)

well the way it sits the feed is on top and the drain is on bottom. so its fine. But I will say that my drain line right off the turbo goes straight down but then it makes a 90 left and down to the oil pan hmmmm

Fbodyjunkie06

iTrader: (10)

I don't see that causing the problem, hopefully tomorrow some of the sponsors will be on and can help you out.

What I can remember about turbo clocking is that the discharge volute has to be at in a certain posistion relative to what posistion the turbo is mounted to allow adequate drainage. Even if the drains and feed are in the right places if the oil just pools in one spot and never has the chance to drain then you will see what is happening now, and that's the turbine housing is heating up so hot that it's finally burning that oil that has pooled in that spot off. This is why you don't see it on light throttle or under normal driving.

Somone correct any of this if it doesn't sound right, but I think that's pretty accurate.

BadgeZ28

iTrader: (28)

sounds like oil is being sucked into the intake during boost. How is your motor venting set up?

98Camarod

iTrader: (43)

How is your PCV system set up?

ferrari360man

iTrader: (1)

i got the revExtreme dual valve catch can set up installed all properly. No oil residue at any of the fittings either.. so I doubt thats it.

98Camarod

iTrader: (43)

Is there a breather any where in your pcv system?

ferrari360man

iTrader: (1)

like a breather filter on the oil cap?

98Camarod

iTrader: (43)

That's a good example. Is there oil coated in the engine bay as well? If there is, the breather may not put out any oil during idle time, but under load it can smoke up a storm.

MUSTANGBRKR02

iTrader: (91)

Is there a check valve in your Pcv setup? If not you could be pushing boost into the crankcase and causing this.

ferrari360man

iTrader: (1)

the revextreme catch can setup has dual check valves to make sure these problems dont occur. I however do not have a breather on my oil cap.

ferrari360man

iTrader: (1)

and the car doesnt smoke under load. Its after a wot run that I let off the gas and it smokes like a bug killer. If I apply the gas again when its smoking, the smoke immediately stops...

pwrtrip75

iTrader: (8)

It definately sounds turbo related and not engine related.

Would having the drain clocked at a slight angle back to the engine be better? This is how I have mine... I figured when you're on it the front end rises a little and then the acceleration force, having it at an angle would be the least resistant path. Its at about the 4:30-5 o clock position.

98Camarod

iTrader: (43)

That makes sense, the oil could be backing up on the decel after the WOT and thats why after you tap the gas it stops.

ferrari360man

iTrader: (1)

yeah my return line is at a funny angle. Idk if I said it earlier but right off the turbo it goes straight down, but then it makes sort of a 90 degree turn to the left and down into the pan... Idk if that could be the issue. Makes me want to make it a more direct straight shot down into the pan.

JRENIGAR

iTrader: (37)

My car does this now after the blower install but I dont have a catch can. Is it really necessary to have a working pcv system routed to the blower or is vented to atmosphere ok with FI?