Subaru Turbo Oil Scavenge |
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Subaru Turbo Oil Scavenge |
AndySomogyi |
Feb 9 2019, 01:13 PM
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#1
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Newbie Group: Members Posts: 22 Joined: 29-January 19 From: Bloomington IN Member No.: 22,839 Region Association: Upper MidWest |
How are you guys with Subaru turbo engines handling your turbo oil scavenge?
I'm actually swapping into a 912, and I don't have any room for a top mount turbo, so I have to go with a bottom mount turbo. That means I'll have to scavenge it somehow. The 914 too is pretty tight engine space wise, you guys also have to run a bottom mount turbo right? A couple options are one of those electric scavenge pumps, but I hear they're crazy noisy and loud. Another option is somehow machining one of the heads and using a cam mounted scavenge pump. Or what about using a power steering pump as a scavenge pump? |
914forme |
Feb 9 2019, 04:15 PM
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#2
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Times a wastin', get wrenchin'! Group: Members Posts: 3,896 Joined: 24-July 04 From: Dayton, Ohio Member No.: 2,388 Region Association: None |
Nope engine bay is bigger than you think, does not have the issue with the rear engine lid rolling down at such a huge angle. 914s have run them in stock location, trunk cut, or up high in front, there is room, and all other locations.
The 930 had a scavenger pump, it was mechanically drive. Plenty of electrical units out there, get one that is a real gear pump. But I would say you might want to reach out to someone who has don this swap. RonW thread on here and nasioc should give you an idea what your up against. Page 2 on the nasioc thread shows his turbo placement, no need for scavenger pump. |
wndsrfr |
Feb 9 2019, 07:25 PM
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#3
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Senior Member Group: Members Posts: 1,427 Joined: 30-April 09 From: Rescue, Virginia Member No.: 10,318 Region Association: MidAtlantic Region |
I'm going to ask a noob question....if the turbo bearing is pressure fed, then that pressure could push the oil back into the sump as long as there's no backpressure on the relief tubing....seems that you could get away with it other than minor seep allowing some oil smoke on startup after sitting a while??
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Chi-town |
Feb 9 2019, 08:21 PM
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#4
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Senior Member Group: Members Posts: 850 Joined: 31-August 18 From: Disneyland Member No.: 22,446 Region Association: Southern California |
There's no good way without a dry sump system.
If you keep the oil drain higher than the oil level you'll be fine |
tazz9924 |
Feb 9 2019, 10:09 PM
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#5
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Senior Member Group: Members Posts: 703 Joined: 31-May 15 From: Mooresville NC Member No.: 18,779 Region Association: None |
I'm going to ask a noob question....if the turbo bearing is pressure fed, then that pressure could push the oil back into the sump as long as there's no backpressure on the relief tubing....seems that you could get away with it other than minor seep allowing some oil smoke on startup after sitting a while?? It makes sense but doesn’t work like that |
Maltese Falcon |
Feb 9 2019, 10:25 PM
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#6
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Advanced Member Group: Members Posts: 4,620 Joined: 14-September 04 From: Mulholland SoCal Member No.: 2,755 Region Association: None |
When we were building the turbo systems for the (then new) 928's, same low mounted turbo oil return issues. Problem solved by using the Weldon 12v (FAA grade) oil pump. Has #12 a/n fittings, and high duty rating...just don't run it dry so run a separate switch, other than the "On" from keyed ign. You can even pump the oil straight uphill to the return area you choose.They are not cheap and have a super good track record...unlike the Ebay pumps. Weldon ships from their factory in Ohio.
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Maltese Falcon |
Feb 9 2019, 11:06 PM
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#7
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Advanced Member Group: Members Posts: 4,620 Joined: 14-September 04 From: Mulholland SoCal Member No.: 2,755 Region Association: None |
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Jonathan Livesay |
Feb 10 2019, 04:32 PM
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#8
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Senior Member Group: Members Posts: 740 Joined: 13-March 10 From: La Canada CA Member No.: 11,461 Region Association: None |
Nope engine bay is bigger than you think, does not have the issue with the rear engine lid rolling down at such a huge angle. 914s have run them in stock location, trunk cut, or up high in front, there is room, and all other locations. My 1971 914 with an EJ255 (2.5 liter) has more room to work on the motor than my 2002 WRX STi with an EJ207 (2 liter). (IMG:style_emoticons/default/dry.gif) |
914forme |
Feb 10 2019, 07:43 PM
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#9
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Times a wastin', get wrenchin'! Group: Members Posts: 3,896 Joined: 24-July 04 From: Dayton, Ohio Member No.: 2,388 Region Association: None |
You can always use an oilless turbo also. Compturbo
You can mount these any which way, no drain back, no, keeping bearings in proper orientation, you want to mount them in the as a skid plate more power to you. But I don't see an issue with mounting them higher than the engine, in the front. Best of luck with the swap, and (IMG:style_emoticons/default/thisthreadisworthlesswithoutpics.gif) |
burton73 |
Feb 11 2019, 11:25 AM
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#10
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burton73 Group: Members Posts: 3,461 Joined: 2-January 07 From: Los Angeles Member No.: 7,414 Region Association: Southern California |
This opens up things. I do not know how the bearing or lack of one works but lots of ideas.
Bob B |
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