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one of the great unwashed
 
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Turbo Oil Return

Where does the 930 oil return to from the turbo? I assume it goes through the (gear drive?) return pump and (where exactly) back to the oil system.

I picked up an electric oil pump, as I think I had a bit of oil return problem at the track. I currently gravity drain to the left chain cover.

Thanks!
Pat
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Patrick E. Keefe
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Old 01-20-2007, 05:43 PM
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As you stated, the return oil goes from the turbo sump tank to the cam driven pump and then to the side of the oil tank.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
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Old 01-20-2007, 05:51 PM
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Old 01-20-2007, 05:57 PM
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one of the great unwashed
 
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Thanks Brian
I figured the tank would be a good place to return the oil to. I'll have to route the line up to the neck, as I don't think I have that bung on the stock SC tank.
Pat
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Old 01-20-2007, 06:53 PM
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pat

Jerry,phil and I are all using the sump as the scavange pump it has worked very well for jerry and phil and I will let you know shortly as mine is almost back together.. henry at supertec felt it would work perfect as well
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Ben

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Old 01-20-2007, 07:35 PM
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Ben, what do you mean by "using the sump as the scavange pump"? Are you saying that you are draining oil to the engine sump? i thought you were draining into the chain cover.

Thanks,
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Old 01-21-2007, 08:45 AM
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I was but changed to the sump plate as it is a natural scavange.. The 3.2 guys just go into the drain plug.. works well
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Ben

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Old 01-21-2007, 09:15 AM
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Quote:
Originally posted by mb911
I was but changed to the sump plate as it is a natural scavange.. The 3.2 guys just go into the drain plug.. works well
Yup, I'm draining oil from my GT35R to my sump drain plug... easy and reliable solution. If it wasn't, my turbo would tell me
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Merv
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Old 01-21-2007, 01:11 PM
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That is what the 500hp moster does too. For almost 2 years now.
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Old 01-21-2007, 02:32 PM
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Pat, are you having oil return issues at the track with your existing drain solution to the left chain cover? Maybe you need to raise your turbo a bit higher? Use a couple extra flanges to lift it up a bit perhaps
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Merv
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Old 01-21-2007, 03:57 PM
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Yeah, Merv
I think for street use it would be OK, but the track is a bit harsh. I fear the sump drain may induce vortexing at the oil pickup, so I wondered how the 930's did it. I have to think it over some more. I can't get any more elevation on the turbo than I now have.
Pat
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Old 01-21-2007, 05:33 PM
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Pat, alternatively, you can gravity drain it to the lowest point in the left lower valve cover.

The issue I see with electric pumps is that they eventually will burn out and fail Gravity draining is a more permanent solution.
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Merv
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Old 01-21-2007, 06:21 PM
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This gravity drain solution seems too simple. I thought that the drain needed the shortest run possible for proper flow. Don't get me wrong, I am really excited to not have to worry with the chain cover.
I think I would feel better about using the valve cover.
I feel like the drain plug is too exposed; it would be the lowest thing on the engine and could catch on something and break off.
Am I being too anal?
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Old 01-22-2007, 05:42 AM
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Quote:
Originally posted by ben parrish
This gravity drain solution seems too simple. I thought that the drain needed the shortest run possible for proper flow. Don't get me wrong, I am really excited to not have to worry with the chain cover.
I think I would feel better about using the valve cover.
I feel like the drain plug is too exposed; it would be the lowest thing on the engine and could catch on something and break off.
Am I being too anal?
the 3.2 plug is on the side of the case so no way to scrap really
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Old 01-22-2007, 01:46 PM
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Ben,
What about your sump...what are the chances that you'll hit something and knock off the drain line? I think there's plenty of room, but, what do you think?
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Old 01-22-2007, 05:03 PM
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wait and see. I will be posting something in a few days on my SS3.2 engine rebuild thread.. I will show you the sump.. It will be pretty trick wel not really but it will be slick
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Ben

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Old 01-22-2007, 05:41 PM
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Nah, I think ur being too anal

I drain to the sump drain plug and drive over speed humps, driveways etc... all the time. I don't go driving in the bush, so I think I'll be safe
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Merv
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Old 01-22-2007, 06:36 PM
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Id like to see a photo of the sump drain idea.
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Old 01-23-2007, 03:22 PM
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stay tuned on my 3.2 ss engine build on the rebuild forums there will be pics shortly
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Old 01-23-2007, 05:41 PM
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Quote:
Originally posted by quattrorunner
Id like to see a photo of the sump drain idea.
I'll take a snap for you when I get home tonight.
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Merv
'89 911 Turbo Cab
Protomotive MAP ECU, Twin Plugged Heads, GT2-EVO CAMs, 3.3L fully finned P&C's, ARP fasteners, C2T head gaskets, Titanium Retainers, Turbo spec valves, springs & guides, 964 splash valves, GT35R BB turbo, GSF Stainless Headers, Magnaflow Exhaust, Full bay Intercooler, TiAL 46mm w/gate, TiAL 50mm BOV, Apexi AVC-R EBC, SPEC Stage3+ Clutch kit, Crane CDI Ignition
Old 01-23-2007, 06:14 PM
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