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2G Turbo Oil Drain Line Angle

Posted by Kai Hefner, Jun 12, 2020

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  1. Kai Hefner

    Kai Hefner Freelancer

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    Calgary, AB, Canada
    Ever since I did a turbo swap I had a really slow leak from the turbo oil line (which I upgraded when I swapped but I guess it just didn’t seal right).
    So now I paid for this oil drain line already made to make sure that it doesn’t leak. Was wondering, is this 90 degree into the oil pan too steep of an angle? I remember one of my old buddies said to watch out for the stuff, something about oil pooling in the line. Basically is the bottom of the 90 degree fitting too angled and will it cause issues?
     

    Attached Files:

    1

    1990 Nissan 240sx
    rwd · manual · Misc Vehicles

    Road Race Build 908  2

    1998 Eagle Talon TSi AWD
    awd · manual · 2G DSM
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  2. TSiAWD666

    TSiAWD666 Freelancer

    2,572
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    Joined Aug 15, 2003
    Herndon, Virginia
    I think you're overthinking things and wouldn't worry about it.
     

    Road Race Build 15K  14  371

    1999 Mitsubishi Eclipse GSX
    377 whp · 416 lb/ft · 2G DSM
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  3. ec17pse

    ec17pse Freelancer

    4,749
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    Joined Nov 1, 2008
    London, UK, Europe
    perfection - no.

    does it work - sure

    . ideally you want it flowing into the pan rather then stopping and being pushed into it but you will know if its an issue if you start pushing out out the turbo as it backs up
     

    Road Race Build 10K  10  57

    1997 Mitsubishi Eclipse GST
    175 whp · 180.1 lb/ft · 2G DSM
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  4. Sjd6795

    Sjd6795 Proven Member

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    Joined May 14, 2014
    Wilsonville, Oregon
    Gravity will do it's thing. I don't see any issues I mean you can always get a 45 degree fitting and swap it out on the next oil change anyways.
     

    Street Build 510  11

    1997 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
    Sjd6795

    Street Build 1K  0

    1991 Eagle Talon TSi AWD
    manual · 1G DSM
    Loading...
  5. Kai Hefner

    Kai Hefner Freelancer

    404
    163
    Joined Jun 21, 2018
    Calgary, AB, Canada
    Honestly I already have the 45 degree fitting, I just don't want to drain and add oil again LOL
     

    1

    1990 Nissan 240sx
    rwd · manual · Misc Vehicles

    Road Race Build 908  2

    1998 Eagle Talon TSi AWD
    awd · manual · 2G DSM
    Loading...
  6. Kai Hefner

    Kai Hefner Freelancer

    404
    163
    Joined Jun 21, 2018
    Calgary, AB, Canada
    Thanks for the responses though!

    Are these oil drain lines widely available as bolt-in stuff? I got this guy all sealed together at a good price and wondering if it's worth kitting together for people.
     

    1

    1990 Nissan 240sx
    rwd · manual · Misc Vehicles

    Road Race Build 908  2

    1998 Eagle Talon TSi AWD
    awd · manual · 2G DSM
    Loading...
  7. Sjd6795

    Sjd6795 Proven Member

    512
    101
    Joined May 14, 2014
    Wilsonville, Oregon
    Just hold off until the next oil change then. Your lines and fittings are good size and considering it's just a return line you'll be fine.
     

    Street Build 510  11

    1997 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
    Sjd6795

    Street Build 1K  0

    1991 Eagle Talon TSi AWD
    manual · 1G DSM
    Loading...
  8. Sniffbooger

    Sniffbooger Proven Member

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    Joined Apr 12, 2020
    Torrance, California
    Do they make these oil returns in a flexible braided line in the correct length with the end couplings attached?? Mine is leaking too, and the hard line is a little crimped...it would be nice to have a flexible one!
     

    Street Build 292  8

    1998 Mitsubishi Eclipse GST
    fwd · manual · 2G DSM
    Loading...
  9. Sjd6795

    Sjd6795 Proven Member

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    Joined May 14, 2014
    Wilsonville, Oregon
    I know STM offers nylon braided lines but they are pricey. You can piece them together cheaper yourself and just pick the line you want. Flexible is the way to go though it makes turbo installs so much easier.
     

    Street Build 510  11

    1997 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
    Sjd6795

    Street Build 1K  0

    1991 Eagle Talon TSi AWD
    manual · 1G DSM
    Loading...
  10. jinscho

    jinscho Proven Member

    591
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    Joined Jun 16, 2017
    Bangor, Pennsylvania
    AN lines are the way to go in my opinion.. this setup was fairly inexpensive and I have zero issues with oil draining back.
     

    Attached Files:

    Street Build 2K  13

    1999 Mitsubishi Eclipse Spyder N/T
    fwd · manual · 2G DSM
    Loading...
    Dreams Realized likes this.
  11. Sniffbooger

    Sniffbooger Proven Member

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    Torrance, California
    That AN setup looks nice! What size are the hose and fittings? Where did you find the shiny new end pieces that bolt to the housing and pan?
     

    Street Build 292  8

    1998 Mitsubishi Eclipse GST
    fwd · manual · 2G DSM
    Loading...
  12. jinscho

    jinscho Proven Member

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    Joined Jun 16, 2017
    Bangor, Pennsylvania
    -10 lines, everything can be purchased from STM
     

    Street Build 2K  13

    1999 Mitsubishi Eclipse Spyder N/T
    fwd · manual · 2G DSM
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  13. Sniffbooger

    Sniffbooger Proven Member

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    Torrance, California
    You mean something like this??!!....I was digging through a box of parts I had sitting around and found these! I think I just need the braided line...but these have barbs so I may just use a rubber hose and skip the bling..
    IMG_20200612_172629834_LL.jpg
     

    Street Build 292  8

    1998 Mitsubishi Eclipse GST
    fwd · manual · 2G DSM
    Loading...
    ryan_c2g likes this.
  14. jinscho

    jinscho Proven Member

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    Bangor, Pennsylvania
    Those will accomplish something very similar to the an lines, as you said, minus the bling ROFL

    Pretty sure those are push lock fittings.
     

    Street Build 2K  13

    1999 Mitsubishi Eclipse Spyder N/T
    fwd · manual · 2G DSM
    Loading...
  15. Sniffbooger

    Sniffbooger Proven Member

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    Joined Apr 12, 2020
    Torrance, California
    Just watched a short video here...


    looks like these push lock fittings are designed for the braided lines, and can be used without band clamps, if the correct diameter hose is used...but mine are the piano black fittings so the braided line would be too shiny....I'll just go with the plain black hose instead...all that bling just gives the cops more reason to write you a ticket and send you to the referee check....CA sucks like that
     

    Street Build 292  8

    1998 Mitsubishi Eclipse GST
    fwd · manual · 2G DSM
    Loading...
  16. 1990TSIAWDTALON

    1990TSIAWDTALON Moderator

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    1992 Eagle Talon TSi AWD
    14.74 @ 117.04 · 1G DSM

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    1990 Mitsubishi Eclipse GSX
    awd · manual · 1G DSM

    793  18

    1967 Chevrolet Camaro RS
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    1998 Eagle Talon TSi
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    1990 Eagle Talon TSi AWD
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    MorrisonFab likes this.
  17. Sjd6795

    Sjd6795 Proven Member

    512
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    Joined May 14, 2014
    Wilsonville, Oregon

    Street Build 510  11

    1997 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
    Sjd6795

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    1991 Eagle Talon TSi AWD
    manual · 1G DSM
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  18. JusMX141

    JusMX141 Moderator

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    Yup. You've already downgraded from stock by going to 10AN and reducing the inside diameter of the drain line by 1/4", now you've added a sharp bend right at the pan which, on a gravity drain, is a bad idea.

    You want the drain to turn upward as quickly as possible but with the least amount of a bend as possible to promote the best drainage. The only way this can be done is with either two 45's or a 60 and 30 fitting depending how far the turbo is placed away from the engine by the manifold selection.

    Here's why you want the drain to turn upward quickly...the way our engines sit in the bay, the inlet at the pan is not the lowest part of the drain. This is a terrible design but it's what we're stuck with unfortunately. If the fitting at the pan on this car was a 45, the flow would be much better and it would keep oil from laying in the line as well.

    72695152_1368065943356109_2325886509187596288_n.jpg
     

    3K  0

    1998 Mitsubishi Eclipse GST
    manual · 2G DSM

    6K  14

    1997 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM

    3K  0

    1992 Eagle Talon TSi
    manual · 1G DSM

    3K  0

    1993 Eagle Talon TSi AWD
    manual · 1G DSM
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  19. jinscho

    jinscho Proven Member

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    I'll have to double check the line size and my receipts, the inner diameter of the AN line that I used definitely wasn't 1/4" smaller than the stock drain tube.

    My original plan was to utilize a straight fitting at the turbo, and a 45 at the pan, but the angles wouldn't line up. I don't think two 45s would have done it, but I never even considered using 60s or 30s. Wish this thread would have been around a few months ago when the motor was still on a stand and I could measure these angles without having to lay on my backROFL
     

    Street Build 2K  13

    1999 Mitsubishi Eclipse Spyder N/T
    fwd · manual · 2G DSM
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  20. Sniffbooger

    Sniffbooger Proven Member

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    I just measured, since my parts are still out of the car, and the inner diameter of my rubber hose is 5/8" but the inner diameter of the -10 AN fitting is only half inch... So it looks like it's a little bit restricted over the stock pipe.
     

    Street Build 292  8

    1998 Mitsubishi Eclipse GST
    fwd · manual · 2G DSM
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    1990TSIAWDTALON likes this.
  21. 1990TSIAWDTALON

    1990TSIAWDTALON Moderator

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    Here is what the RTM -12an drain comes with...It's bulky but it drains exceptional. I had this kit (and have one on my Red Talon) and was going to install it on my Holset when @MorrisonFab came out with their kit and they asked me to do a "trial run" before they released it.
    As you see, I went with theirs as it was much easier to work with and fit like a glove.
    15920648258454239966013190649024.jpg 1592065040819679504644511821013.jpg
    Screenshot_20200613-112559_Samsung Internet.jpg
     
    Last edited: Jun 13, 2020

    Street Build 5K  29

    1992 Eagle Talon TSi AWD
    14.74 @ 117.04 · 1G DSM

    1K  14

    1990 Mitsubishi Eclipse GSX
    awd · manual · 1G DSM

    793  18

    1967 Chevrolet Camaro RS
    rwd · automatic · Misc Vehicles

    Street Build 1K  7

    1998 Eagle Talon TSi
    fwd · manual · 2G DSM

    Street Build 6K  14  25

    1990 Eagle Talon TSi AWD
    13.620 @ 108.460 · 1G DSM
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  22. Mello

    Mello Proven Member

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    This is the wrong way to compare. Diameter is not the same as area for flow rate. The area difference with 5/8 diameter vs 1/2 makes the 5/8", 56.3% more area for flow over 1/2". Do the math.
     
  23. Sniffbooger

    Sniffbooger Proven Member

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    Torrance, California
    I was never really good at math...but the 1/2" inner diameter is still less flow than the 5/8" right??
     

    Street Build 292  8

    1998 Mitsubishi Eclipse GST
    fwd · manual · 2G DSM
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    jinscho likes this.
  24. Dreams Realized

    Dreams Realized Proven Member

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    Sorry don't mean to detract from this thread @1990TSIAWDTALON did I read correctly that the @MorrisonFab drain kit bolts into the factory location as in no need to weld on? I bought my drain kit from racepart solutions a la @Archer Fabrications Holset HX40 install thread but would rather have ease of install
     

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    1997 Eagle Talon TSi AWD
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  25. Mello

    Mello Proven Member

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    Bigger is better. Good general rule is you do not want the smallest section of the drain less than OEM size or below the oil pan opening.
     
    JeffGS-T97 likes this.

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