Quote:
Originally Posted by alice
If your oil scavenge system is not working properly in evacuating oil from the turbochargers, most of the time it will come out on the turbine side but many, many times, I have seen it come out the compressor side, as well. Just depends on the type of scavenge failure. From what you have said, If you had a pump failure, even for 1 minute, I believe this best explains the oil in the intercooler. However, it could have also come from the PCV system, over time, depending on the design and system efficiency. I have seen both problems, oil pump scavenge issues explaining most of the instances of oil in the intercooler. You definitely want to determine where it came from and correct it. MAF sensors really hate oil and will upset a tune in a heartbeat. That is why I have always recommended drilling that .040 hole in the bottom of the outlet of the intercooler. If you ever see residual oil at the hole, or trailing from it, you know for sure something is wrong. Oil should NEVER come out the hole, only a bit of water which leaves no trail. Hope this explanation helps.
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Your posts are always helpful Monty thanks. I'm leaning more towards the pcv because I know it was getting worse towards the end(i must have been getting a lot of blow by and crankcase pressure) as far as how much oil was getting into the filter on my turbo compressor. See the way I had my MightYMouse catch can hooked up was one line going to the passenger rear valve cover and the other line(with valve) going to the intake vacuum. Then I had an oil cap fitting that went to my air filter on my turbo. This acted as the fresh air but when WOT it would pull/push oil into the turbo filter. I was just never really happy with how the MM system was working. Im sure the can itself works fine just not the way I had it setup. Either way I will be changing my whole evac system.
I still need to check and make sure there are no problems with the turbo seals and scavenge pump. Scavenge pumps have always made me nervous. I would like to wire in some sort of idiot light or something to let me know if the scavenge pump stops running. Like if it were to stop pumping during a 1/4 mile run. I've only had it not work one time and that was when in first stated the car after putting the turbos on. I forgot to put an extra fuse in my jumper so the pump had no power. It idled for about 2 minutes before starting to smoke a TON out of the exhaust. None in the intake But that was at idle, maybe at full boost it works differently and more oil gets pulled into the intak side of the turbo? I'm not sure how that works. All I know is I have too much money in this new motor to have this reacur. These new rods are strong but they won't compress a liquid either and I would be in the same boat. I like your 0.040 hole idea though since that would let you know if you have oil in the intercooler without actually pulling all the tubing apart.