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Guest Message by DevFuse

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Uhhhhh...oil in the vacume lines!!!!!!!!!!!!

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10 replies to this topic

#1 soobme


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Posted 04 September 2003 - 12:26 PM

OK, Iv'e been having problems with vacume lines blowing off on the EA82T. Not that big of a deal, I have just been zip-tieing them back on. But yester day on my way to work I passed a big rig, @ full boost (11psi) and I thought I smelled burning oil. I looked in the rear view, and I see a big cloud of oil smoke in the road right where I passed, but I wasen't smoking any more. When I got to work I found 1 of the 3 vac. lines that go to the base of the TB off, and there was oil all over the top driver side of the intake. It looked like all the oil came out of the vac. line. I put it back on ( and the other 2 that came off) and I havent had any problems.
So what's up with that?!? Oil in the vac. line:eek: It looked like it was fresh out of my engine.

#2 ShawnW


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Posted 04 September 2003 - 12:57 PM

Is it old?

There was a guy on here selling a kit to collect the oil and put it back where it goes but I don't remember which one of the guys it was. Its one of the big Atlantic coast guys but thats all I remember.

#3 MilesFox


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Posted 04 September 2003 - 12:59 PM

so you suppose it could be clogged pcv lines, valve?
my buddy's spfi motor was choking oil until the pcv lines were replaced with standard heater hose

#4 soobme


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Posted 04 September 2003 - 01:13 PM

Iv'e got the center case vent hose going to open air, the pass. side going to the intake hose before the turbo, and the driver side going to the port on the intake ( where the idle air bypass valve gets its air from) No PVC valves any where, is that bad? I plan on running them all to 1 air box with a small UNI air filter on it.

#5 Nug


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Posted 04 September 2003 - 01:54 PM

Anyone run a vacuum pump on the crankcase of their turbo or high rpm motor? Under full boost or high rpm, the crankcase pressure can become real high, even with open vents and stuff. If you can SUCK air out of the crankcase, HP is gained and oil control restored. This reduces oil leaks too. HP goes up, because, you know, the backside of the pistons are pumping air also. If there's nothing to pump, then ther's less parasitic loss.

They sell vac pumps specifically for this (Moroso), some people use smog pumps (GM).

#6 Setright


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Posted 04 September 2003 - 03:10 PM

Uhmmm, not sure I agree on the parasitic loss:

When two pistons move "down" the other two are on their way "up", leaving the volume of the crankcase constant.

#7 Skip


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Posted 04 September 2003 - 07:44 PM

Setright beat me to it, well done
Plus how can you create pressure with wide open ports in the cam cases, and in the crankcase?
If you are saying the blow by is so high as to cause this, you need new rings not a vacuum pump.

I will say this, if you restrict the crankcase pressure vent system on a turbo-the cam seals will blow out of their glands.

To add, there have been posts saying aftermarket PCV valve are not good for turbos, stay with gen U wine Subaru for these.

#8 ByTheSea


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Posted 04 September 2003 - 10:46 PM

Any chance that cloud of smoke you pumped out was the product of detonation? My SPFI ea-82 is starting to get weak rings and the blowby through the crank case venting into the intake tract causes oil build-up as well as making more detonation by raising the intake temps under extreme loads. I solved my problem by venting everything to a dump can and plugging the intake port. On the vac hoses popping off??? Is there a check valve at the vacuum port in the intake that keeps boost from entering the vacuum system? Seems to me there should be something else you'd be pressurizing the vacuum system every time the turbo was pumping. If there is a check valve could it be malfunctioning and causing the lines to pop off? Well those are my random guesses having never worked on a eaT.

#9 Nug


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Posted 05 September 2003 - 11:41 AM


I have an article around here that might explain myself, let's see if i can find it...

#10 Nug


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Posted 05 September 2003 - 11:52 AM




Maybe this can explain it better than I. Looks like an easy way to add some power, especially for the turbo guys.

#11 soobme


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Posted 07 September 2003 - 10:57 PM

Well the problem is back, and regular now. Every time I get on the boost for more than a second or two, I start blowing blue smoke. It is so thick that it trys to foul out my plugs:eek:
Could it be that the turbo is making enough draw on the intake hose ( where I have my pasenger side engine vent hose going to ) that it is SUCKING oil into the turbo/ intake?
:o As I type this it makes sence!! It has not done this for the last 2 days, but this morning I checked my oil and I was 1qt low. I put a quart in, and BLAMO!! I have the oil burn problem agen. It's got to be the case vent going into the intake hose BEFORE the turbo, the vacume line wasent the one with oil in it, it was the intake spiting oil out hte vac. line port under hard boost!

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