Turbo Oil Supply

[Negative Boost]

Sounds great. Good luck with it mate

[Cuzzo]

So what was the difficult part.

Could you explain what you were trying to do?

All those fittings will make you pocket alot lighter.

[30psi 4agte]

He was putting the oil pressure switch and turbo oil supply lines in. He didnt want the t piece straight out of the block as they are prone to breakng.

Talasas: How mch did it end up costing ?? Any pics for the newbies who will prob end up asking question on who its done etc ?


We all love pics

[Talasas]

I'll get some pics up ASAP, I haven't yet fitted it to the car as I need to cut the line I bought to put 2 more fittings on. I just don't have the time until next week because of uni. Bit of a learning curve for me to as I'm new to most of this.

All up with the fittings (including the return) + braided hose + silicon hose cost me about $150. It's a fair bit for some silly oil line but it's a neccesity so I didn't want to skimp too much.

My next task will be to make a reliable drain, it seems the turbo doesn't sit quite as high as it could have (for reasons I will bitch about later ) and so I don't have a very large vertical drop to make use of.

I've been going over some ideas in my head to get around this without using a scavenge pump (since they are hard to find and costly).

On idea uses a way of shaping the hose so that drain is maximised under the forces of driving and the other uses a buffer tank. I'll go into more detail when I have time.

Thanks again guys.

[Talasas]

Well it's been a week and progress is slow. I promise I'll have pics up soon, I only just cut the braided line today and am concerned if it'll leak or not.

But now it's time to move on to oil return. Again because of my lack of foresight, the turbo is mounted lower than is ideal. This means that the oil return has only a drop of about 5cm and is about 25cm away from the sump (no fitting has been welded on yet, have to take the sump off again ) so there's a really small inclination on the drain line as it would be.

I've learned that in times of desperation people use a scavenge pump with an aux sump. This would be ideal but costly, and there's the problem of flow rates, I could get a VDO 12V oil pump which flows about 1.8L/min at 58psi but it would be useless if the flow rate coming out of the turbo was less than that. Unless I made it intermittent where it switched off every 5 mins or something like that to allow the aux sump to fill up again.

An idea I had was to just use a buffer tank which sit right under the turbo oil drain that could fill up and the tank would extend all the way to the sump and then a small silicon join with a drop into the sump. This would work well I think except for when the car is under forces (braking, turns and such) but would still work better than a near horizontal oil line.


Any thoughts?

[30psi 4agte]

Its not what you want to here........ but for the price and head f&&K of setting up a scavange pump you would prob be better off with a new manifold

One that sits the turbo higher ?

[NeoNasty]

I fail to understand why a low presure line back to the sump has to flow so well. The presure from the line in will be enough to push the oil back to the sump. Not up hill, but even at a slight angle down should work OK. Couldn't you just put slightly more oil in the system to compensate for the extra the turbo and lines will hold?

Maybe Im missing something important as Ive never had a non factory turbo car.

[feral4mr2]

talasas, my turbo flange is abouts level with the top of the oil filter boss on the block. the oil return doesnt look right (doesnt look like enough height), but i have no oil return issues. you dont have a side on pic of the engine with turbo in place?

[Talasas]

Yeah I can get a photo when I get home tonight.

This is my first attempt at a turbo and I knew very little before I started. One thing I won't be doing is making another manifold, I really like the design I have and there's no way in hell I'm doing it again, I've already had to rebuild the downpipe as it is.

I would much rather set up a scavenge pump but I think I can overcome this without the need for one.

Neo, the reason you need good flow (and I'm only going on what I've learned here) is if you're braking the oil will force it's way forward stopping what's coming out of the turbo which eventually could cause the seals on the turbo to go. Because it only relies on gravity it's very susceptible to external forces.

This buffer tank idea is the go I think and seeing as feral has said his works with only a slight incline the tank itself will work under the forces of driving. I did some thinking about it with some diagrams today and it should work out well and can double as a slight oil cooler at the same time.

Here it is as a quick diagram, three on the left are a rear view (looking facing the front of the car) the other two are side view looking toward the passenger side.

[Talasas]

whoops double post

[Cuzzo]

Aslong as its not horizontal and the line is big enough im sure it will be fine. Last resort would have to be make a bigger sump and give it enough room to flow into the sump

[Talasas]

Ok thanks cuzzo. I'll see how I go, I wish there was a way of me gauging the performance of the setup. I'll play around with this some more.

This is my work in progress, I had another look today, maybe I can work around it if I lose the long studs and use short bolts instead on the turbo drain and drill the hole in the sump about 10cm to the right of the oil cooler return.

[30psi 4agte]

Do you have a pic in car ?

I dont like it/ not sure it will work like that.

Can you angle the core of the turbo to wards the drain hole any more to achieve that little bit more of an decline

[XR Pilot]

Pardon my ignorance with turbos, but is it possible to rotate the Exhaust housing and compressor housing so that the oil drain faces towards the block? It might give you the angle you need.

[Cuzzo]

Hmm i like your thinking... Possibly.mr 30 psi?