VNT A** Kicking

[camboscams]

So here's the deal, I've already smoked one VNT15 in less then 200 miles. I rebuilt it myself with a Gpop shop rebuild kit. with that turbo after 75 miles or so it started smoking badly and soon it finally started to rub the housings after 150 miles. so i purchased a new center section from Gpop and got it installed last night. I did all the things Jim told me to do, like checking my oil supply and return. I blew into my oil return and could hear a little bit of a gurgle but that was with the car on jack stands on the front too so on level ground i would think that the return would be above the oil level. I've got a -10an bung welded as high as i can on the oil pan close enough i could weld the top of it from the outside, just like every other TD conversion out there. Now the oil supply i removed the vacuum pump and primed the engine (an 11mm 6pt socket works well to do this) until i had oil coming out of the supply line and it was as good a flow as i could produce by hand. I then did this again once the line was connected to the installed turbo. And i let it idle for at least 5 minutes upon first start up SO (pardon my rant) i drove the car last night for a short test drive and it didn't seem to smoke when i got home (So far so good) but it was night so im not 100%. Then for today's ass kicking, i was removing my intake tube for some minor alterations and noticed quite a bit of oil in the tube, like more then normal turbocharged engine amount. The outlet of the turbo seemed pretty dry so i thought maybe it was some residual oil left int the tube, so whatever, i cranked it up just for kicks to see if there was any down in the compressor housing and started to raise the rpm and it started blowing a good amount of black engine oil out 

Does anyone have some input? I'm waiting on a grommet for my pcv grommet for my g60 valve cover to drive it again but that should be tomorrow. I'm at a loss and i'm really leery of destroying this turbo so please understand my reluctance. And again sorry for my rant if you've made it this far...   

[fatmobile]

 Since you don't have a grommet, what are you doing with the hole in the valve cover mean whilst?
 Did you try disconnecting the oil return line and seeing how much oil is leaving the turbo?

[camboscams]

Since you don't have a grommet, what are you doing with the hole in the valve cover mean whilst?
 Did you try disconnecting the oil return line and seeing how much oil is leaving the turbo?

For now the hole is loosely filled with the oil separator which then goes to the pre turbo intake tube. So i would think that i would have even less crank pressure then normal. so i would think that would help rule the high crank pressure blowing the oil past the seals problem.
And i have not removed the return and watched how much oil runs out. What would that help me tell? Too much oil flow?

[fatmobile]

 It would let you know how much oil is being supplied to the turbo.
 I'm not sure how much is supposed to flow at idle.
 It would let you know if you need to install a restrictor in the oil supply line,
 It would let you know how much block pressure is trying to escape through the turbo.
 I think the block pressure can be higher than cranckcase pressure inside the head. Do you have a block vent (other than at the valve cover)?

 

[camboscams]

Okay i'll try that today. And as far as a block vent i have none. The vacuum pump is still has its factory outlet going into the block. Would that add much pressure to the crankcase?

[R.O.R-2.0]

my 1.5TD used to blow oil out of every orifice and seal.. and being that 1.5D's have no dip stick tube (dipstick seals directly to the block with a felt o-ring) at all, you know where most of the mess was on that engine..

anyways, that engine never blew oil thru the turbo oil seals, and it had a crank case vent, and a valve cover vent (both had catch cans, and were basically road draft tubes.. even with all the vents, that engine still had LOADS of blow by when it boosted up.. at idle, take the cap off and there was basically nothing.. the cap would dance around on the valve cover a bit, but nothing horrible. on boost, it would blow a solid stream of oil out the valve cover (if you forgot to put the oil cap back on)

[rallydiesel]

Did the new centre section include the shaft/compressor/turbine? If not I would be looking at an out of balance issue.

[camboscams]

New everything, for the center section.
Yea i'm wondering if i should vent the crankcase, from where the vac pump goes into the block, to the intake tube. I got my linkage done and it runs nice!! i didn't even break 1000 degrees once going over 15psi. so we'll see. im going to take my intake tube off and instect for large amounts of oil. there was zero smoke so i'm thinking there wont be any oil.

[camboscams]

So i removed my oil return and watched the mount of oil leaving the turbo and it seamed like a good amount but it was coming out of a -10an return line and it wasn't anywhere close to filling it. It has coming out about as fast as you could pour cold 15-40 through it. My only other concern is that the oil return below the level of oil. But doesn't everyone's?? Its 5/8 return line does that compensate for the fact that its below the oil level?

On another note that thing spools fast!!! All i have is a linkage from the injection pump to the vnt arm. its a 1:1 ratio for now and i don't have an actuator to limit the boost yet so i can't even lay into it much or its over 15psi like instantly! I'll try to post some pictures maybe start a thread for the whole conversion soon

[R.O.R-2.0]

So i removed my oil return and watched the mount of oil leaving the turbo and it seamed like a good amount but it was coming out of a -10an return line and it wasn't anywhere close to filling it. It has coming out about as fast as you could pour cold 15-40 through it. My only other concern is that the oil return below the level of oil. But doesn't everyone's?? Its 5/8 return line does that compensate for the fact that its below the oil level?

On another note that thing spools fast!!! All i have is a linkage from the injection pump to the vnt arm. its a 1:1 ratio for now and i don't have an actuator to limit the boost yet so i can't even lay into it much or its over 15psi like instantly! I'll try to post some pictures maybe start a thread for the whole conversion soon

as long as you keep it under 25 psi, you should be fine.. the turbo should only make 20-25 psi maxed out with the vanes open. but if you shut the vanes, it could make enough boost to blow the head off..

[camboscams]

Well first off i can't run more then 15psi due to my setup, and when i have my vanes in the least boost position i can only make 6 psi at the governor with full pedal. 

[R.O.R-2.0]

Well first off i can't run more then 15psi due to my setup, and when i have my vanes in the least boost position i can only make 6 psi at the governor with full pedal. 

why can you not run over 15 psi??

i ran way over 15 psi to a bone stock 1.5 TD..

and if you can only make 6 psi full pedal with the turbo open, then you have no fuel to spool it..

[camboscams]

I can only run 15psi because i'm running a 1.6 rotating assembly in a 1.5 block and head, so the added volume coupled with the smaller combustion chamber pushes my compression ratio upwards of 25.5:1. And i've had to put several headgaskets on this engine and i'm tired of it. So until i can get another block together i'm going to take it easy on the boost.

And for the fuel since there is no global measurement of how much fuel i'm putting out, all i can say is its a giles super pump, and with the old turbo i could hit 1400 degrees and more in no time and all the while rolling coal. So since i have no comparison to how much fuel your running you must have way more then me. 

But anyways, why am i getting the amount of oil in my intake that i'm getting? I just don't get it

[Powered by Spearco]

Forgive me as I have not read the entire thread but are you rerouting your CCV back into the turbo inlet? If so, do ya think thats the oil thats in your intake?

If you are rerouting your CCV back into the intake, why?

[camboscams]

You have me second guessing myself now, i've only been doing it cause that's how it was done when it was N/A. I've considered doing like a road draft setup, but i guess i could just put on of those small filters on it and let it vent to the atmosphere. That would eliminate the issue of too much crank pressure.