#2303228 - 02/07/08 08:52 AM
Turbo Question: Max angle for oil feed line?
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LNXGUY
Post Master Supreme
Registered: 08/06/00
Posts: 106943
Loc: Barrie, Ont,
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Hey guys, because of the stock config of the vnt20 turbo, I am going to have to rotate the exhaust housing in order to make sure things like up properly. One of the things I need to worry about is the oil feed line angle. I want to get it as close to vertical as possible, but what the acceptable range? Because of the vnt mechanism, I am only allowed so many rotational adjustments before things are way out of wack.. Could I get away with a feed like at 20 degrees? 15?
I am also thinking of tapping the oil pan for a new return line and using the current return hole as a CCV vent back into the DP, bad idea? Good idea? I know that I am going to make making more pressure in the crankcase running this type of setup compared to stock and I need to add another vent or two.
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-Bill The GN would OWN you, your children and your children's children. '09 E90 335 d
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#2303595 - 02/07/08 11:15 AM
Re: Turbo Question: Max angle for oil feed line?
[Re: LNXGUY]
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00OldSi
Sr Member
Registered: 10/19/06
Posts: 1181
Loc: DC
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Hey guys, because of the stock config of the vnt20 turbo, I am going to have to rotate the exhaust housing in order to make sure things like up properly. One of the things I need to worry about is the oil feed line angle. I want to get it as close to vertical as possible, but what the acceptable range? Because of the vnt mechanism, I am only allowed so many rotational adjustments before things are way out of wack.. Could I get away with a feed like at 20 degrees? 15?
I am also thinking of tapping the oil pan for a new return line and using the current return hole as a CCV vent back into the DP, bad idea? Good idea? I know that I am going to make making more pressure in the crankcase running this type of setup compared to stock and I need to add another vent or two.
My oil line is barely vertical. If I was guessing its about 25-30 degrees. Havent had any issues over the past 9years. The pressure will keep the oil flowing. Just make sure there are not kinks in the line. Here.. not the best pic...
Venting back into the DP is fine. if its not alot of work for you.
_________________________
"Step on it bitch..it's just turbo lag..!"
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#2306729 - 02/08/08 08:35 AM
Re: Turbo Question: Max angle for oil feed line?
[Re: Euphoricuck]
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LNXGUY
Post Master Supreme
Registered: 08/06/00
Posts: 106943
Loc: Barrie, Ont,
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i doubt you need another vent or two.... you arent making THAT much.
There are a few guys that are seeing weaping turbo seals running only 20-22psi. I'd rather be safe then sorry.
I always though the feed line was the important one...
_________________________
-Bill The GN would OWN you, your children and your children's children. '09 E90 335 d
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#2307751 - 02/08/08 01:32 PM
Re: Turbo Question: Max angle for oil feed line?
[Re: LNXGUY]
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SamuraiSam
Post Master Sr
Registered: 07/29/02
Posts: 8828
Loc: Bellingham, WA
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I dont know specifically about the VNT turbo. Is there no way to clock the CHRA independent of the exhaust and compressor housings to make it perfectly level? The feed isnt the important line, at all. It's under alot of pressure, until you restrict it (usually at the banjo bolt, if you have a banjo feed, or with some other sort of restricter. The important one is keeping the drain close to vertical so the oil doesn't pool inside the turbo. like that pic above shows, on a regular turbo, it doesn't actually matter that much.
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#2307811 - 02/08/08 01:46 PM
Re: Turbo Question: Max angle for oil feed line?
[Re: SamuraiSam]
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LNXGUY
Post Master Supreme
Registered: 08/06/00
Posts: 106943
Loc: Barrie, Ont,
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I can clock the hot/cold side independently, but because of the vnt mechanism, I am restricted to only a few positions on the exhaust housing. So I am trying to make the feed line as vertical as possible, along with having the hotside line up with my exhaust manifold. It's pretty close now, but the feed line is probably at a 15 degree angle or so. I will make sure the return line is straight down, then back into the pan.
thanks man, this really helped me out. I was so fucking worried about toasting the turbo because the feed line wasn't 100% vertical.
_________________________
-Bill The GN would OWN you, your children and your children's children. '09 E90 335 d
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#2308710 - 02/08/08 05:17 PM
Re: Turbo Question: Max angle for oil feed line?
[Re: LNXGUY]
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Chris92Sc2
Post Master Supreme
Registered: 12/21/00
Posts: 13705
Loc: MI USA
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Feed line doesn't really matter since most use a small restrictor anyways (Banjo or otherwise). The return line on the other hand needs to be as straight as possible with room for backup before the block/oil pan.
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#2314491 - 02/11/08 12:58 AM
Re: Turbo Question: Max angle for oil feed line?
[Re: Chris92Sc2]
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qksl2
Post Master Sr
Registered: 06/30/03
Posts: 3279
Loc: So-Cal
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Don't worry about the feed line angle. Run it carefully, bracket and secure the feed line so it doesn't break (they do, so bracket it to the motor). The return line is the only thing that you have to worry about the angle on.
You can use the crank case as a vent, but I'd put a baffle behind it to reduce how much oil splatters all over.
Ian
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#2314785 - 02/11/08 07:41 AM
Re: Turbo Question: Max angle for oil feed line?
[Re: qksl2]
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LNXGUY
Post Master Supreme
Registered: 08/06/00
Posts: 106943
Loc: Barrie, Ont,
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Ian, after reading about venting the crankcase to the downpipe, it looks like the angle at which the bung is welded is super important. From what I've read, a 45 degee angle to induce some vacuum instead of the possibility of having a positive pressure problem.
If I do end up tapping the oilpan for a new return line, I'll make sure to get a little baffle welded up behind the hole...
Thanks bud!
_________________________
-Bill The GN would OWN you, your children and your children's children. '09 E90 335 d
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#8978824 - 03/20/17 09:58 PM
Re: Turbo Question: Max angle for oil feed line?
[Re: LNXGUY]
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ypMs
Jr Poster
Registered: 03/20/17
Posts: 80
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#9089872 - 07/27/17 02:54 AM
Re: Turbo Question: Max angle for oil feed line?
[Re: ]
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zhengjx
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