Oil drain fitting

911TT33 · 08-31-2011, 04:15 PM

Does anyone here know where I can get a custom oil drain fitting made up?

It needs to have a tight bend radius with a swivel end which screws into the motors oil drain port.

Earls don't make one with a tight enough bend radius.

Space is the issue.

TurboKraft · 08-31-2011, 05:10 PM

How about a metric banjo fitting and hollow bolt?

911TT33 · 08-31-2011, 08:19 PM

Good idea. Any idea what size metric fitting I'd need for that oil drain port?

Would the banjo solution be suitable for the oil drain from two turbos?

smurfbus · 08-31-2011, 08:33 PM

I wish I had a drain port to start with : )

911TT33 · 08-31-2011, 09:25 PM

Ok, so the oil drain port is M20*1.5mm.

Just need to find a banjo and hollow bolt fitting to suit

TurboKraft · 09-01-2011, 01:49 PM

For oil drain from two turbochargers? No, I don't think it's a good idea. I know some people have had success with this, but we have not.
As low as the K16s sit, how are you going to plumb lines from the bottom of the turbos (or from the 993 or 996 turbo drain cans) under or around the heat exchangers and to the single banjo fitting?
Looking at a car up on the rack right now, it looks as if the oil drain hose would have to snake around the heat exchangers, either forward or back, and then to the drain. Or, down and under the heat exchangers (in harm's way!) and then back up to the drain fitting. No bueno.
Remember, oil should be gravity draining whenever possible. And you have centrifugal forces at work when driving, wanting to push the oil towards the back of the car.
Do you have a 930 scavenge pump? If so, consider trying a layout similar to this.

911TT33 · 09-01-2011, 04:05 PM

Good point. Thanks Chris.

I think I'll use drip tanks under the turbos, and then plumb the drip tanks into an electric pump of suitable flow capacity, and then from the pump, plumb the outlet back into the engine at some point. Possibly plumb it into the oil drain port.

TurboKraft · 09-01-2011, 04:14 PM

Return it to the top of the case, into the breather cover.
Look at Cole's thread on this.

911TT33 · 09-01-2011, 04:42 PM

Quote:

Originally Posted by TurboKraft

Return it to the top of the case, into the breather cover.
Look at Cole's thread on this.

Is there an existing port there I can just screw in a fitting for the oil line? Nice solution!

TurboKraft · 09-01-2011, 05:55 PM

Yes, if you are ditching the thermovalve switch, or going EFI, then you can thread in an AN/Metric adapter.

flash930 · 09-04-2011, 01:12 AM

Just a query about scavenger pump on stock 930. Had turbo rebuilt and when installing inadvertingly loosened fitting at scavanger pump resulting with oil bypassing seal in turbo because pump not working. Fixed problem however turbo now smokes when changing gears on hard acceleration. How much oil flow or pressure should there be from pump to reseviour?

lucittm · lucittm's Garage

The scavenger pump is a positive displacement gear rotor pump and pulls a good vacuum. You were probably sucking some air but if the fitting was on the pump, even loosely, it was pulling oil from the turbo sump. The turbo smoking is most likely a coincidental problem and it may be the oil just getting past the turbine seals or some residual oil in the cold side that has worked its way into the intake system. You can pull the intercooler and look inside for an oil slick on the inside walls.

Mark

smurfbus · 09-04-2011, 10:36 PM

Could be a rich AFR buff too.