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H2odiesel's Avatar
Join Date: Jun 2013
Posts: 125
Electric scavenge pump

I am still getting some smoke from the exhaust on my recent turbo conversion. I added a 930 J pipe and a 3ldz to my 1985 3.2 Carrara. I am using gravity return on the oil from a 12AN fitting to the engine sump. I used a restricted fitting on the feed side. I had initially bolted up the Used 3ldz as it was when I received it. Very little shaft play and the exhaust side looked reasonably clean. It made good power but also a decent amount of smoke and even specks of wet oil on the under side of the Tea tray spoiler. I had a local shop go through the turbo and put a kit in it. The smoke is much improved but still annoying. A wisp every now and then at idle. A puff that is hard to notice in the rear view at take off. And as reported by a friend following light blue when I really get on it but I can't see it in the mirror.

To the point, I don't have a drive for the factory scavenge pump at this point so I am going to try an electric pump as a test. Can I use my existing 12AN line to the pump and expect good results or do I need to come up with a catch can type drain and then to the pump? Can I Run a vane type fuel pump for this test ( like a Holley Blue pump) or do I need the real deal or a tranny cooling pump?
Old 03-10-2014, 04:42 PM
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TurboKraft's Avatar
Join Date: Mar 2005
Location: Phoenix, AZ
Posts: 2,546
Fuel pumps do not hold up to the heat.

Scavenge Pumps

This problem is what these pumps are made for.
Smaller, lighter, quieter, less power draw than a Tilton trans/differential pump.
Chris Carroll
TurboKraft, Inc.
Tel. 480.969.0911
email: -
Old 03-10-2014, 05:20 PM
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Chain fence eating turbo
Join Date: Dec 2008
Location: Austin, TX
Posts: 8,715
I gravity feed to the sump too. It doesn't work well, but it works.

Really need to scavenge too. If you search, you can find oil scavenging pumps 12V for about $150 IIRC.

Just google around.

They're not as pretty as Chris' link above, but they should work.
Old 03-10-2014, 06:40 PM
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cliyde's Avatar
Join Date: Apr 2006
Location: Hurricane Region, NC
Posts: 600
FWIW, I've been running the turbo oil drain back to sump for years now, track sessions included, all without issues or smoke. Running a K2700 and use -10AN steel braided hose and 90 degree swivels on outlet/inlet side. Hose has about 15 degrees of decline from turbo drain outlet down to sump.

You might check/experiment with the hose orientation before making the scavenge switch...

- Best regards
- '88 911 (3.6 Transplant, Big Reds, Coilovers, & Headers)
- '12 Audi B8 S4 (6MT)
- SOLD! '84 911 3.2 Turbo Targa
- SOLD! '85 928S 5sp with LSD
Old 03-10-2014, 08:36 PM
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