Hey guys, I have a problem where sometimes if I put too much foot into the gas petal, and start to use the turbo, I get a good long puff of smoke what I can assume to be either engine oil entering the combustion chamber, or 2 stroke oil via the rotary aviation OMP adaptor.
I have been trying to find a definitive way to tell if it is:
1. OMP related in some way
2. Turbo hot/cold side oil passing by the seals
3. Or engine oil seals blow by

1. I don’t think it is the OMP in any way because I am around 2 stroke smoke from jetskis/seadoos all summer long and I think I have a pretty good nose for what that particular smell and brand I use smells like, though I wont rule it out just yet. I just cannot conjure up a logical way for this to be the problem.

2. This is my most likely candidate IMO because it happens when boosting, and when oil pressure is at its highest (from what I can tell testing) Though I have been trying to restrict the oil pressure for the turbo inlet down to a better approximation of what has been given to me as numbers to go by. The WB sensor seems to have a slight amount of black carbon buildup around the area that sits inside the bung, but higher up on the sensor is pristine with very little dry ash looking buildup.

From what I can tell I don’t think it is blowby from the rotor seals either, because my plugs really don’t look like they are building up a unusual amount of carbon on the surfaces, and I checked both the pyro meter brass bung plugs I have in the turbo manifold for any unusual residue, and they have a slightly ashy covering on their surface with no hint of carbon or oil residue at all.


This smoke seems to happen much more prevalently when the car is cold, which I can only make an assumption that the colder the oil is, the higher the viscosity, and therefore the higher the pressure.

Any ideas on what the problem could be, or any cleaver ways to test and come to a definitive solution?

 

What is your crankcase ventilation setup?

 

First think I would check.

 

its oil passing through the seals of the turbo because the oil cant drain into the oil pan fast enough

vent your crankcase, check for a restriction in your oil drain line. or run a restrictor in your feed line. any of these three done incorrectly can cause smoke whlle/after boosting

 

^^^ I agree 100% with him. Seems like there is a little oil getting by when you boost, so like mentioned before up the size of the return line and vent that crank. If that doesn't fix it your seals might be on their way out.
I'm just curious but what turbo are you running?

 

make sure the crankcase is vented correctly first. that is an easy fix via the nipples on the oil fill neck. a -10 drain line should be sufficient if it flows nice with no restriction.