Clocking the oil drain on turbo??

[baloo]

Just an unmeditated thought regarding adding turbo to 3.2 (1987 911)...

One of the things I worry about is how low the catch can on the turbo must go, and how high it must be to facilitate gravity drainage.

What are the thoughts about clocking the drain so that it is at the 8 o'clock position, instead of 6 o'clock (the conventional way)?

This would allow much better clearance of the catch can, due to it being higher, plus it would allow a drainage angle more conducive to gravity flow.

Yes, there would be oil sitting below the level of 8 o'clock in the turbo itself, but surely the oil pressure would be pushing the oil up to the 8-position, enough for drainage?

Anyone tried this?

[GJF]

No offset clocking. Your just asking for trouble. If the turbos center section is parallel with the rocker box center section, then you can drain to anywhere below, ie lower valve cover, sump cover, timing covers ect.

[turbobrat930]

As GJF stated above.. just add an AN fitting to both the chain cover, and to the other side of the catch can. Then make up an AN line from the catch can to the chain cover... If there is too much oil that the scavenge pump can handle, it will drain to the chain cover.... never have to worry about it again...

[baloo]

OK. So don't clock the turbo so the drain is not a 6 o'clock position.
Thanks.

[GJF]

Exactly, the
The inlet at 12 and drain at 6.

[Tippy]

My 87 Carrera has had the turbo clocked to about 7 o'clock. It has never been at 6 due to coming too close to T flange.

The Turbonetics CHRA was shot, so can't tell if this was cause from this or not.

My Holset appears fine so far, but not that long of time being on.

I have a Protomotive chip for your car if you ever want to run Motronic.

LMK,
Cory

[GJF]

You can clock them as much as 60 degrees. I have clocked them even more than that without failure. But it all depends on the way it terminates, to the fitting or hose nipple . If it's a nice direct dump with no bends, then it usually doesn't give you any trouble. But adding any bends to slow oil flow tends to back them up. I had a problem years ago where I drained into a oil pan and the windage from the crankshafts rotation, back feed the drain from the turbo at speed causing a nice smoke show. It's just a safe practice to run them vertical if possible so oil doesn't rest in the CHRA at all.