lubrication of Turbo

[Lovesong]

We have a garrett GT12 turbo and we do not know how put oil into the turbo, i think that we have not an item. how do we do it?
Thanks.

[Lovesong]

We have a garrett GT12 turbo and we do not know how put oil into the turbo, i think that we have not an item. how do we do it?
Thanks.

[Kirk Feldkamp]

The bottom of the CHRA is the one with the four holes in it. The two outside holes are bolt holes. The small hole is the oil inlet, and the big hole is for the oil drain. You need to make some sort of piece that can be bolted on, and feeds and drains the somehow. The pressurized oil should come from an oil galley in the motor. The drainback really does need to be 1/2" diameter like they say on the spec sheets. Make sure you situate the whole turbo up high enough in the car so that there is a generous slope for the drain on its way back to the pan. I'd show you pictures, but you've gotta learn to do this on your own somehow! http://fsae.com/groupee_common/emoticons/icon_confused.gif

-Kirk

[threehondas]

turbotwig's got it.

I'm running a GT12 as well, email me at 1bab1@qlink.queensu.ca and I can send you a drawing of our oil supply drain part/turbo flange.

Bruce
http://engsoc.queensu.ca/formulacar/engine/

[pengulns2001]

what are you guys using to restrict oil pressure?

[Kirk Feldkamp]

A little plug with a little hole.

-Kirk

[nivlacoey]

We are also working on the garrett GT 12 turbo for our CBR 600. I would like to know how you guys supply the lubricating oil for the tubro. Do we need cooling water for the turbo?

[raska]

You should do a search here and read all their provided information it is outlined. Although a few have done differently, it is very advisible to utilize water coolant. You can supply oil easiest often by finding a block/head oil passage machining path plugged by a set screw. Also take not of suggested pressures and oil return in the documentation you find.

[nivlacoey]

We would like to know u guys supply the lub oil direct from the engine sump (using the engine's oil pump) or came up with a standalone oil system just to supply oil to the turbo. Because we have consulted our technical consultant and he suggest us to make a standalone system so as not to interfere the main engine oil system

However making a standalone system required additional pump and oil tank.We also didnt get much info such as the required oil capacity from garrett website. Hence we really need your techincal advices.

[Kirk Feldkamp]

Your consultant is a goofball then.

Usually there is a pressure switch for a dummy light on the engine somewhere. That's a good place to take the oil feed from because you're not using the dummy light anymore. As for flow... follow these guidelines and you should be ok:

1. Get the pressure feeding the turbo down to the spec on the drawing.

2. Use the check valve system Cam Thai can provide you a drawing of.

3. Mount the turbo high enough so that the drain slopes downward the entire way back to the pan. The drain should not be horizontal anywhere along the path, INCLUDING at the drain flange takeoff. I've seen a lot of teams use a 90 degree fitting coming out of the turbo, and that is just asking to have your turbo smoke.

4. Use a 1/2" ID drain tube. That means DO NOT a 3/8" ID. Many teams use a AN-6 hose for the drain. You will likely have problems if you do so. USE 1/2" ID FOR YOUR DRAIN and save yourself form grief!!!

-Kirk

[nivlacoey]

thanks Kirk.

is the engine's oil pump capacity sufficient to provide lub oil to both the turbo and engine? we are afright that the overloading of the oil pump may lead to insufficient oil supply to the engine.

as for the cooling water, can we also connect the turbo's cooling water from the engine's radiator? or can we do without the cooling water for the turbo and just using the lub oil to cool down the turbo?

[310Turbo]

Your engine will provide more than enough oil flow and pressure for the turbo in addition to the engine.

Yes, cooling can be taken from the radiator, just make sure that it's part of your pumping circuit so the water isn't stagnant.

[R/TErnie]

the oil feed line should be taken from the oil sending unit...usually this is filtered. (depends on app tho)

I also recommend an oil restrictor and using a -3AN feed line.

www.atpturbo.com (http://www.atpturbo.com)
http://www.atpturbo.com/Merchant2/graphics/00000001/Catalog%20Images/Oil%20Supply/oil022-01.jpg

[VFR750R]

Oil can be pulled off in many places. We've always pulled ours off the end of the main gallery where there is a plug anyway. It can also be T'd off an external line to the head if there is one.

I also agree with the -3 line, it's more then adequete.

[Mikko Ahola]

We used oil return pump in our last years car. It was a small pressurepump for oil. That way we could install the turbo way lower than without the pump. You just have to make sure that the pump doesn´t stop too early... http://fsae.com/groupee_common/emoticons/icon_biggrin.gif

[Peter7307]

To add a little here to the comments above.
Oil enters the turbo as oil but comes out like dirty whipped cream so as you can surmise there is a huge increase in volume and entrained air.

This is basically the reason for the large difference between the input line diameter and the outlet line diameter.

Keep the outlet line as straight as possible and as close to vertical as you can manage as well as at least 1/2 inch ID not OD.

Any kinks or obstructions in the drain line will result in rapid turbo failure.

Pete.

[R/TErnie]

right-o Peter7307,
Most turbocharger failures I've seen were due to small, kinked, horizontal, or improperly routed (trying to push oil uphill :P).

Its a gravity drain...so make sure its vertical. Rule of thumb we always use at LEAST -10 for drainlines. try to make the drainline enter the pan ABOVE the oil line. (dry sumps...have an advantage here http://fsae.com/groupee_common/emoticons/icon_wink.gif )

[Discretely elite]

Does anyone know how a dry sump will affect the oil drain? Clearly gravity is not the only force pulling the oil from the turbo but I wonder how much pressure is too much and how low I can safely mount the turbo and still remove the oil from it.

[Pete M]

The bottom of our turbine housing is about 5 mm from being below the chassis. We don't rely on gravity at all, but instead rely on a dedicated scavenge pump. Wet sump though.

We figure if we're going to pay the weight penalty of running a turbo, it's damn well going to be as low as we can possibly make it. There are all sorts of problems with mounting it that low though, and we have had issues in the past. It's not the easy option.

[mighty boy]

Hi there

My names Brian

I have been grave digging these threads and really need some help.

I have had a early model charade carby and turbo on my mighty boy and it was going great till the turbo ate it. I have now put a garrett gt 12 on my boy and its blowing smoke out the exhaust. I have read the articles on here and put a half inch id return line to the sump being careful to keep it straight down and the sump attachment is well above the oil level in the sump. I have the oil feeding straight from the oil pressure switch on the back of the block. I have read articles that say as long as you have at least 10 pound pressure at idle and at least 29 at max torque the turbo will be fine. So my question is do you guys restrict oil pressure to your gt12 and if so how much pressure do u have there?.....
Buy the way Garrett told me to give the turbo full oil pressure but its no good if its blowing past the oil seal.

Thanks and i hope someone can help me

[mighty boy]

well i have now found the info i needed on oil pressures through this web site and also garrett spec sheets.
Oil at idle 10 psi minimum
Peak torque 28.5 psi minimum

Please help with my next question

I am using 4mm oil feed line so what size inline restrictor should i use?
The one on R/Ternie pic on this tread looks about 2mm would that be ok as i dont want to starve the turbo of oil and cook it

[Kirk Feldkamp]

http://fsae.com/eve/forums/a/tpc/f/125607348/m/14810520...10930211#14810930211 (http://fsae.com/eve/forums/a/tpc/f/125607348/m/14810520211?r=14810930211#14810930211)

It really depends on what engine you have (mighty boy? I have no idea what that is!), so don't just blindly follow some number. You need to try something (start at about 0.050" for kicks), measure the resulting pressure, and then dial in the hole diameter to meet the specs called out on the sheet. Make sure you dont just fire up the engine and measure it... oil pressure will change significantly with temperature. In other words, make sure the engine is warmed up completely before you look at the oil pressure.

-Kirk

[Kirk Feldkamp]

Haha! Just found some "Mighty Boy" pictures... that thing looks like the lovechild of a Honda Del Sol and a mid 80's Toyota truck. Ahh, forbidden love.