corsa 180 turbo smoking after boost

[careyboy89]

I have a 65 corsa turbo dosnt smoke a drop until I let off of the gas after high rpm leave it in gear and get back on gas then a cloud of blue smoke comes out please i need help

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[61SuperMonza]

Sounds like the turbo may have a bad carbon seal. You could remove the exhaust pipe from the turbo and look/feel in the exhaust housing for oil to know for sure. Has the turbo been re built? If not that is most likely the issue.

[careyboy89]

I took the turbo off it has alot of burnt oil deposits on the exaust side but none on the intake side

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[careyboy89]

the carbon seal is perfect nice and smooth and the piston ring seal is too so i dont know why it would be leaking unless there is pressure in the crank case not letting it drain back

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[61SuperMonza]

Is the engine stock and has it been rebuilt? Are you running a YH carb or other? Is all the PCV system intact? Hard to fully diagnose the problem without more info. You may have some worn valve guides as well.

[61SuperMonza]

If the PCV system checks out you may think about an oil puke tank. The crankcase in a vair is quite small and the tank would remove some of the pressure. I would check out the PCV system first.

[61SuperMonza]

I have a couple of final comments on this subject. The turbo drain tube could be slightly blocked. If you regularly run the engine up on boost you should let the engine run at idle for a few minutes before shut down. A poor mans turbo timer. You may already know this and if so disregard.

[careyboy89]

the engine has 20,000 miles on it it has modified heads hypo pistons the turbo was just rebuilt when engine was everything is original on the outside

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[careyboy89]

here is some pics

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[careyboy89]

If the PCV system checks out you may think about an oil puke tank. The crankcase in a vair is quite small and the tank would remove some of the pressure. I would check out the PCV system first.

how would I go about installing a puke tank

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[61SuperMonza]

If you have inspected your PCV system and it all checks out and you still are blowing blue smoke then a puke tank/catch can may help. I'm making the assumption that you run your turbo hard. Otherwise this shouldn't be necessary.
You can install the puke tank/catch can a couple different ways.
1 have your valve covers modded with a line/fitting grazed to the top of each valve cover that will accommodate a AN 10 line and fitting. Run the lines to the location of the tank in the engine bay. You will want to check the puke tank for oil and drain periodically.
2 this method may be the way to go with the least amount of work. Run a line from the large chrome tube coming from the crank case to the inlet on the tank and the line from the outlet into the aircleaner housing.
Hope this helps.
You said your heads were modded. What was done and who did the work? Just curious.
Good Luck,
Norm

[61SuperMonza]

Just wanted to say you have a nice looking engine bay. I would like to see some other pics of your ride.
One other thought, what type of oil are you running?
If you aren't running synthetic, you may consider this. The turbo is much more tolerant to synthetic oils, won't coke up as fast on the hot side. I don't recommend this with a new engine but one with 20000 miles and no significant oil leaks this may help your situation.

[careyboy89]

my heads where modified to fit 90 mm jugs ported and polished by a guy named Tony in my home town

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[careyboy89]

here is some pics of my 65 corsa turbo its a la car posi trac rear quick steer gear ratio 4 speed am fm radio the car was fully restored every bolt and nut 3 years ago by me and my father who has since passed away 8 months ago due to an aneurysm he was the only person who made the led tailights for the corvairs which I have since picked up making and selling

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[careyboy89]

more pics

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[careyboy89]

Just wanted to say you have a nice looking engine bay. I would like to see some other pics of your ride.
One other thought, what type of oil are you running?
If you aren't running synthetic, you may consider this. The turbo is much more tolerant to synthetic oils, won't coke up as fast on the hot side. I don't recommend this with a new engine but one with 20000 miles and no significant oil leaks this may help your situation.

thank for all your help ive got all my parts in today to rebuild the turbo but I have a gut feeling that thats not the problem since it was not that old since last rebuild and it looked perfect when I tore apart but since I had it off might as well be smart and refresh

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