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Old 10-16-2008, 10:38 AM   #1
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Default Oil drain tube sizes..what r u using?

Just wondering what size lines you guys are using for your oil drain lines. I assume nothing is too big, just overkill, but what size is too small? My oil feed line to my SR20 turbo is -4 and I am using a 1/8" I think pop rivet for my restrictor, so what size I.D. drain hose should I be using?
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Old 10-16-2008, 10:47 AM   #2
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5/8" should be sufficient.
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Old 10-16-2008, 11:02 AM   #3
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Quote:
Originally Posted by Braineack View Post
5/8" should be sufficient.
Agree, I'd run -10 or -12
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Old 10-16-2008, 11:15 AM   #4
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I'm using a -4 feed line with no restrictor and a -10 drain line. Now I less than 10 miles on my new set up so I'll let you know how it turns out, but with the -4 feel line and no restrictor the turbo see a max of 30psi of oil.
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Old 10-16-2008, 12:14 PM   #5
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Quote:
Originally Posted by photoeye0 View Post
but with the -4 feel line and no restrictor the turbo see a max of 30psi of oil.
Is this at idle?


With no restrictor and a -4an line I don't see how it wouldn't see over +90psi of oil pressure when you near 7000RPM.

I personally have to run a .040" restrictor with my -4an line; even a .065" orifice is too large.
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Old 10-16-2008, 12:28 PM   #6
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-4 feed. 5/8 drain, no restrictor.
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Old 10-16-2008, 12:44 PM   #7
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Originally Posted by Saml01 View Post
-4 feed. 5/8 drain, no restrictor.

T25G? that a Ball Bearing turbo? Those tend to have a built in .035" restrictor.
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Old 10-16-2008, 12:58 PM   #8
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-3AN feed, -10AN drain hose
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Old 10-16-2008, 01:10 PM   #9
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Quote:
Originally Posted by Braineack View Post
T25G? that a Ball Bearing turbo? Those tend to have a built in .035" restrictor.
Journal bearing off an SR20.
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Old 10-16-2008, 02:14 PM   #10
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I'm using some of that water pump tubing that runs to the heater core (5/8" I think). Here's some oil flow using a -3 feed line (no restrictor) t3 center and a shimmed oil pump at ~1000 rpm idle. I've run about 500 miles since the install and haven't had any issues w/o a restrictor. YMMV

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Old 10-16-2008, 02:15 PM   #11
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On a T25 turbo a -8, -10, or 5/8" is sufficient.
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Old 10-16-2008, 05:20 PM   #12
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Quote:
Originally Posted by m2cupcar View Post
I'm using some of that water pump tubing that runs to the heater core (5/8" I think). Here's some oil flow using a -3 feed line (no restrictor) t3 center and a shimmed oil pump at ~1000 rpm idle. I've run about 500 miles since the install and haven't had any issues w/o a restrictor. YMMV


I've been looking for this video forever.

Anyway, -8 = 3/8", right?
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Old 10-16-2008, 05:42 PM   #13
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-8 ~ 1/2"
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Old 10-16-2008, 06:30 PM   #14
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just a minute....
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Old 10-16-2008, 06:58 PM   #15
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Nominally, the AN sizes go in increments of 1/16". So -8AN should, in theory, be 1/2" ID.

That said, these is tremendous variance in actual sizing from one hose to the next, which is one reason why, when assembling AN lines, you have to be sure that the hose ends you have selected are rated as being compatible with the particular hose you are using. (variances in OD, even for a common ID, are another)

As an example, Earl's Auto-Flex has an actual ID of .438, whereas Earl's SuperStock had an ID of .5, and Earl's Speed-Flex has an ID of .563.


That said, +1 on -10. (that's looks weird to write)
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Old 10-16-2008, 07:31 PM   #16
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-4 supply no restrictor, -12 drain . that's on a big 16g. went for the way overkill setup. no issues and it looks bitchen'.
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Old 10-16-2008, 08:30 PM   #17
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Quote:
Originally Posted by Braineack View Post
Is this at idle?


With no restrictor and a -4an line I don't see how it wouldn't see over +90psi of oil pressure when you near 7000RPM.

I personally have to run a .040" restrictor with my -4an line; even a .065" orifice is too large.
Hot idle is right around 7psi if I recall correctly I'll take an other look at it. I'm using a GM brake banjo bolt (found in the "help" section of most parts stores), with a banjo to -4 adapter, and -4 into the turbo and oil psi gauge.
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Old 10-16-2008, 08:35 PM   #18
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So my feed line is a -4 and I am running a 1/8" pop rivet for restrictor. My drain line is 3/8". My question is, will this drain line in time be insufficient and cause my seals in the turbo to blow and leak oil?
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Old 10-16-2008, 11:17 PM   #19
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So if 3/8 -8, am I looking at this chart wrong?

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http://www.anplumbing.com/thread_npt.html

NPT 3/8 closest AN Ftg. Size is 8?
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Old 10-16-2008, 11:44 PM   #20
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http://en.wikipedia.org/wiki/AN_thread

The AN size is based on OD, apparently.
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