Custom 2.7 Turbo Problems
 

I believe I am having an issue with the drain on my turbo. I am getting alot of oil out of my exaust making enough smoke to make the car very embarassing to drive. I have the drain to the lower cam cover as low as I can get it and it is at a slight angle. I'm not sure the eisiest way to tell if the turbo rebuild is bad or if it's my drain or maybe something else. Any advice would be great.
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You could go here to view picture of how oil is drained from turbo charger. http://www.clearimageautomotive.com/Porsche%20Products.htm

I think oil is not getting drained fast enough and pushing oil pass the turbo seal. Just my guess.

youngkang,

Looking at that setup, it appears to be using a catch tank and sump.

Built4sound is using a gravity drain system.

Both setups appear to be very nice.

yes I am using a gravity drain and I do agree that oil not draining fast enough could be my problem. Reconsruction is a large project and I am just looking for comfirmation.http://forums.pelicanparts.com/uploa...1097530237.jpg

Here is the rear view of the drain.

could also just be a bad seal; was the turbo new or recently rebuilt by a reputable outfit? Where do you get your oil supply?

The oil comes from a tee fitting on the pressure sender in the rear of the engine. The turbo has 20 miles on it. I had it rebuilt buy Performance Techniques.

Is that a Rayjay turbo, I have had an issue with oil pass since my rebuild.

Very nice setup!

Looks like the drain back line isn't big enough to me. I would have gone for something like a -8AN or -10AN drain line. It could also be a bit higher too. Use another flange inbetween the turbo and collector to raise it up a bit ;)

Otherwise I'd say you have a seal issue in the turbo :confused:

Sounds like it's probably the drain; some engines have pretty large diameter drains, even when the drain is almost vertical; the oil will tend to get whipped up in there. But it's hard to tell for sure.

Yup, I would have to concur. Increase the drain diameter and angle of the flow. It should be at at an angle of at least 30degrees upwards (from the chain cover perspective).

Keep us posted. Looks like a nice fabrication job :cool:

If you are tapping off of the oil sender, you may be getting too much pressure to the turbo. You usually need a restrictor in the turbo feed line to control the pressure. 40, 60, 80-psi will push oil past the seals and or damage them. Corky Bell refers to restrictors in his book Maximum Boost. I can look up his recommendations if you need it.

I would guess your problem is too much oil pressure going in and not enough draining out fast enough. However lowering the oil pressure in may help more than the draining.

Looks good. Good luck.

Ed

Thanks for the compliments and replies. I did use the rajay turbo and upper pipes, Chappy was nice enough to forward me some directions. Moving the turbo up a little is possible but i could never get 30deg.

i like the restriction idea. at least to try. don't the factory turbo's use some sort of ball to resrict the flow of oil to the turbo?

I doubt it's your feed. I am tapping off the oil sender too and I run a -6AN into the K27HF turbo (I could get away with a -4 or -3AN but I was paranoid of under-oiling the KKK). I have no issues with too much oil pressure. I am gravity draining into the lower valve cover since my turbo is mounted on the side of the engine.

Try the bigger drain line first and moving the turbo up a little. The oil won't back up into the turbo if the slope is sufficient.

From Maximum Boost.

Edhttp://forums.pelicanparts.com/uploa...1097542119.jpg http://forums.pelicanparts.com/uploa...1097542187.jpg

You may be right, BUT it is certainly possible that Rajay (or whatever he has) and KKK use different types of shaft seals. Maybe everyone uses the same type now, but I remember there are different designs for this seal.

I've been having problems with my Rayjay passing oil after the rebuild ( Turbo City).
At first I thought it was the Tilton electric scavenge pump I have to use ( installed in a 914 ) thinking it wasn't keeping up with the flow, but after fabricating a 10oz sump and restricting the oil feed down with a .18 nitrous nozzle jet which is as small as a pin point I still see occasional oil passing.
I am replacing both the Rayjay and the electric pump. I am going to use a cam driven 930 turbo oil scavenge pump and go with a Garrett or K27 turbo.
There are others out there running the same setup you have with a Rayjay and the gravity drain without problems. I tend to believe the problem could be with our old turbos maybe they dont rebuild them like they use to.

Correction on the restrictor I am using .018.
And the other installs I was mentioning are using the Rayjay unrestricted and supply oil from the pressure sender.
If someone knows of a small adaptable oil pressure regulator available I certainly would be interested in regulating down the pressure to 25 and see if things clear up.

IMO, modify your setup to use gravity drain instead of all the added cost and head-aches of using electric, or cam driven scavenge pumps etc...

That gravity drain looks fine. It doesn't need to slope down to work.

The oil supply line should be -4AN and a restrictor to 1/8 or smaller.