Is this turbo drain line fine ?
Posted by Mundane_Shopping9852@reddit | projectcar | View on Reddit | 43 comments
running a drain line off my turbo and I didn’t have any straight An fittings left, I just have the 90 degree coming off the turbo, and then the slight angled one off the oil pan. I’ve heard angles can mess up draining, i’m mostly worried about the top fitting being a 90, so let me know if it works or not, thanks !
boostedmike1@reddit
You should clock the turbo so the drain is at 6oclock position other than that it’s fine
SprungMS@reddit
Journal bearing or ball bearing? Restrictor on the feed, or no?
Needs more info, but turbo is clocked poorly considering oil will be moving away from the drain during acceleration (therefore during higher oil pressure). I’m surprised no one has mentioned that.
If you absolutely must run that 45 from the CHRA, I would still clock it straight down. The 45 headed toward the block is less of an issue than the drain within the CHRA being placed forward and off the “bottom”.
All that said… straight aluminum drain fittings are what, $20 including shipping? Don’t risk your seals. Rebuilding turbos isn’t difficult, but it’s a pain in the ass when you figure the time involved disassembling and reassembling, and a seal kit is going to cost more than the correct fitting.
deevil_knievel@reddit
From a fluids perspective this is a negligent difference in any steady state flow application such as this.
This comment has no relevance to desired turbo orientation, moreso just the plumbing set up. 45 vs 90 isn't even worth talking about in a properly spec"d hose based on a simple nomograph.
SprungMS@reddit
I’m guessing you’re talking from a theoretical standpoint, and you’ve never blown the new seals you just installed on someone else’s poorly configured custom turbo build… The 90 versus 45 isn’t really the issue.
TEAMTRASHCAN@reddit
any sorta downward angle works great in a setup like this, oils got pressure behind it and its going to be an empty tube ahead of it. I would say braking is the scarier time. The oil in the pan is heading up that tube and closing it off from the crankcase.
colonia_Ger@reddit
There is no pressure so why are u using AN lining. I would use normal 13mm push on hose
Sweet_Speech_9054@reddit
I would swap them, the 90 would be better at the bottom. But the angles won’t interfere with drainage enough to worry one way or another. But the turbo fitting should start facing directly down. You should clock the cartridge so the drain is down then reevaluate your fittings. The 30°(?) looks like it would fit better once you do that. And don’t forget some heat shielding around the hose near the manifold.
deevil_knievel@reddit
Hydraulic engineer here: that's perfectly fine, so long as the hose is sized for the correct fluid velocity (which I presume it is because the engineers spec'f the port size)
Mademonn_@reddit
They didn’t invent WiFi drains yet so I would say no
booradleysghost@reddit
Just continually fill it, it's like a dry sump without oil changes.
n00bz0rz@reddit
Total loss oil system. Back to the good old days of combustion engines.
Klo187@reddit
*eventual total loss system, if it’s leaking oil it means it’s got oil
Mademonn_@reddit
If you aim properly it might work
justin_memer@reddit
You should clock your center section to be more level, it can only be like 10-15° from horizontal.
AngryScottish@reddit
might be slightly undersized, but the angle is fine.
Filthy510@reddit
Those look like -6, I'd probably bump that up to at least a -8, but I agree.
Mundane_Shopping9852@reddit (OP)
the hose is 8
AngryScottish@reddit
8 would work, 10 is ideal though if you can upsize.
Filthy510@reddit
This.
KiraTheWolfdog@reddit
Nah, man. I mean, it might technically work, but i wouldn't run it. Clock your turbo correctly and use a straight fitting at 6 o clock.
70camaro@reddit
Send it!
MetaphysicalEngineer@reddit
Probably will be fine, but how urgently do you need to button up this part of the build? A 45 at the turbo would be better if you can swing the delay and cost.
typeltrs@reddit
I wonder if it would work better if the 90 was at the block and the 45 he has was at the turbo
Mundane_Shopping9852@reddit (OP)
Not too urgent, but if this set up works then i’d rather that than wait and order a 45
MetaphysicalEngineer@reddit
Then send it and report back! Drain just needs to prevent pressure building up in the exit of the turbo core which will force oil past the seals.
SprungMS@reddit
If no feed restrictor… lol.
The drain is pointed forward in this configuration. During acceleration, oil will “fall” to the back of the CHRA.
This setup is basically asking for blown seals. Fittings are cheap. Rebuild kits and labor are not.
Mundane_Shopping9852@reddit (OP)
Sounds good, will do
Jojothereader@reddit
The finest
dragonslayer5555@reddit
I would clock the turbo so the outlet is pointing down a bit more and swap the fittings around.
Nice_Side9155@reddit
You need thicker fittings. They come in highflow, but the ones you have will not drain fast enough and kill your turbo after first time on boost.
Sir_J15@reddit
Get a Cummins oil drain line. It will work much better.
Sir_J15@reddit
chuck-u-farley-@reddit
I went with the largest I could fit and used -10 off my turbos for drains, seems to work fine
Fender0122@reddit
Looks fine to me! If you haven’t already planned on it, I’d suggest a heat sleeve on the whole thing, most especially the top part. Huge source of increased oil temps is right there at the inlet and outlet.
harribert@reddit
Put the 45 on the turbo and the 90 in the pan. Clock the CHRA to angle the vertical 10° toward the block. If the hose kinks from the bend radius being a little tight, put a stainless spring inside.
gospdrcr000@reddit
No, it's not connected yet.
akep@reddit
Yeah it’s fine. I would add a heat sleeve to it since it’s close to the manifold. I’ve see them melt and drain oil a few times. One guy drove from NC to NY and lost all his oil right before he got home and roached the engine. Obviously make sure the line you get is oil rated too, not all hose is.
Difficult-Till5031@reddit
No the oil will run right though it.
124Enjoyer@reddit
It still drains down, so it's absolutely fine.
I can imagine a 90 degree being suboptimal if it was going straight up from the sump, but the way it comes off your turbo it's more like 2x 45 degrees, if you get what I mean. Send it!
Mundane_Shopping9852@reddit (OP)
Thanks man !
terrapin-teller@reddit
I think it should be fine, as long as it is sized correctly in relation to your supply and the line is as vertical as possible that bit at the top shouldn’t mess you up.
Mundane_Shopping9852@reddit (OP)
Sweet man, appreciate the advice
Shawndollars@reddit
That's pretty much exactly how I did it.