Hey guys,

One of my friends is having problems with this turbos smoking...

Heres the setup 3/8's feeds to two T3's. (thats is 3/8's line going into the turbo)

the drain is 2 3/4 inch lines y'ed into one 3/4 nipple in the oil pan which is 3/8's larger than came on the volvos.

The drain back isn't perfectly down hill BUT the turbos are about a 1.5 foot above the oil pan/oil level.. the lines aren't kinked but do slope down a inch or two before coming back up to the oil pan.

Everything i've learned in physics class tells me its impossible for the oil to back up to the turbos when they are over a foot above the oil level... oil is not that thick, it pours real easy especially when hot.

and the little section where it goes down and then back up shouldn't matter because energy done by gravity is a change in Y... not a path function.


I'm convinced his oil feeds are feeding the turbos way to much oil, in fact I remeber in the corky bell book that he said some needed restrictors to get the oil pressure down.

What do you guys think?

 

Maybe his shaft seals are just worn?

 

that could be.. especially now that they have possibly had too much pressure on them..


I thik the supplys are definately a first priority problem

 

On the return line thoughts:

When he shuts down, it might be possible for the oil as it slowly drains out of the turbo to build up in the lowest part of the hose.

Work done by gravity would be cancelled out, with respect to small amounts of oil of course, by friction as it slides slowly down the side of the hose.

From what I have read though, I agree with the turbo feed issue though that doesn't count for much as I am just starting to sort of know what I am talking about on this subject.

 

if your return lines do not go straight down. then they will smoke. on rare occasion some people can get away with it. the fact that he is returning both into one pan fitting tells me that one is not likely straight up and down. tell him to put a fitting on the other side of the pan in the same spot and it will go away. If both of the turbos are on the same side of the motor then maybe this wont help. If he just built a engine and used a high valume pump the pressure could be fairly high. We had to resolve this on one mustang with a set of another orafice restrictions. we were overloadig the seals that are not designed to hold pressure back in the first place.



if it doesnt then it could be the seals. But return lines seem to be the #1 cause in home built and even in a few aftermarket systems. but try the poor return/over feed problem. TDC and Incon both told us about this problem in the first place.

 

Hey rooster433, sorry to not have any help on the subject, but was wondering if you could help me out. I'm just curious if you know how your friend got the oil pan tapped for the return line? If he did it a certain way or something along those lines? Thanks man.

 

he drilled a 3/4 inch hole in the pan then tapped a tapperd pipe into it to get the edges to roll down..

Its maybe not the best way but it works.

I still don't see how his can drainbacks can be that big of a problem.. here is a picture

 

It's either the shaft seals or oil feed line.. Get a restrictor for the feed line and it can even help worn shaft seals..

Turbos don't need a ton of oil pressure or even that much oil flowing through them..

I'll bet dollars to donuts that the restrictors will fix your problem.. I've seen it many times..

Cheers,

 

thanks..

Hey dude.. HOws the water injection coming?

I used a mcmaster car m10 nozzel and a shurflow pump.. with it I was able to run over 9 degrees more timing at 9psi and pick up 3mph.

I just bypassed the shurflow pump (got tired of the surging, pulsing pump) and I keep the pressure checked with a regulator.

Hopeuflly it won't burn it up.. but hey they are only $45 right? hehe

I'm thinking about using a nitrous solinoid to activate a second stage

 

what most people don't realize is the oil going into the turbo does not look like the oil coming out of the turbo. The turbo causes the oil to foam up quite abit. Therefore, it does not flow back to the pan very easily, and can back up into the turbo causing the turbos to smoke. -10 line is recommended for the oil drain back line, but running -12 can't hurt.

 

um.....put TWO bungs in the oil pan. Dont "y" the return lines together. I'll bet a buck that's your problem