OK, i am pretty new to Porsche and i have always learned that oil in a turbo goes back in the engine by gravity from the turbo to the oil pan.

But with the turbos being so low in the Porsche, how exactly is the oil going back in the engine? I mean i suppose it comes back through the line that goes towards the rear of the car but that line goes up. How is the engine sucking the oil out of the little box under the turbos?

thanks

 

There is a total of six pumps in the turbo. One pressure and six scavenge. The pressure is used to lubricate the engine and operate the vario cam plus and it is located in the bottom casing .One scavenge, also located in the casing, take tho oil from the casing back to the reservoir. There is two other scavenge pumps located in the head assys and they are driven by the exhaust cam shaft. There function, to take the oil accumulated in the heads from the cam lubrication but also from the two vario cam plus actuators. And these two also take the oil back to the casing. And the last two scavenge are sucking the oil from the turbos reservoir and take it to the bottom of the casing.....Hope this help....

 

wow yeah that helps a lot, where are those pumps located for the turbos and how are they driven?

You say going back to the casing, i suppose this is the lowest part of the engine where you drain when you do an oil change, where the oil pan would be on a normal car?

 

Also, i suppose the line on top of the aluminum box for the oil return is just a breather so that the pump doesn't suck to hard, is that it?

 

Yes, do a search here. I believe there at least 3 places to drain the oil on this car. Engine crankcase, and 2 turbo resevoirs? If you miss one, you can very easily over fill when you are done.

 

First of all to get a good view of the interior of the engine look at the site made by Imagine Auto http://www.imagineauto.com/996TTbuild.htm

If you look at the picture #1 below the arrow is pointing towards the pump driven by the exhaust camshaft to scavenge the oil accumulated in the head and send it back to the casing....All the oil scavenge pumps, except the one located in the casing, are taking the oil back towards the casing (as you mention, lowest part of the engine).

And Picture #2 the real position on the engine

Picture #3 show you the turbo oil tank scavenge pump:

Picture #4 also the turbo scavenge pumps (two in the assembly) . But now you see it is located right below the water pump and share the same mounting assembly. And I have look in the past at the oil diagram and it shows that the turbo scavenge pumps are driven by the intermediate shaft that also drive the main scavenge and oil pump located in the casing...
I welcome anyone who would like to correct this because I never found any specific answer on what drive the turbo oil pumps or if it is simply driven by the same source as the water pump... If you do correct me on that you have to invite me, next time you overhaul an engine and I will assist you for the complete dismantling


And picture #5 show you the oil pumps (scavenge and pressure) located in the casing. (In this case it is a modified one)

And also ttboost is right. There is 4 places to drain the oil when doing the oil change. The tank, the casing, the two turbo reservoirs. But a minimum amount of oil is coming out of the turbos. Some people don't do turbos but I do. I drain only about 1 to 2 onces and I always filter my oil to see if there is any deposit...But that's me....


(Hope this help and excuse my english writing but I trying hard...)

 

I just found what I was looking for. On this drawing you got in blue and red the pumps, in green the drive....

 

A bit concerned about some of the chain guides that broke off in my 08 turbo 85,000 miles
engine was out for coolant leak, I pinned the cams and coolant lines replaced all the chain guides.
One had a small chunk missing.
These were in the filter after 350 miles after minor rebuild.
Should I be worried about debris getting into the smaller oil passages for the variocams? will the filter save the day.

 

Looks to be almost all what was missing. I'd just drive and not worry. What's the alternative? Taking apart the entire motor to look for plastic?

 

That was the plan take the filter out again in another 500 miles and inspect, if anything is found drain the oil, if clean install new filter and go another 500 then drain and fill.
I will check the drain pan see if anything was at the bottom of the engine.Seems unlikely.

 

You're fine. Any fresh pumped oil goes through the filter before it gets anywhere important. There's probably a little plastic on the screen on your main oil pump that will break down over time but I wouldn't worry about it.

 

Great news, I plan on at least checking the filter again in 500 miles.

 

After 6000 miles and 3 oil changes still got some plastic in the filter