Mi16 Turbo Oil Return From Turbo

[M@tt 77]

Been thinking some more about my planned turbo project and was thinking about the oil return from the turbo to the engine.

 

My first thought was to initially get a spare sump drill a hole and have a tube welded on at a 45 degree upwards angle as far up the back of the sump as possible so that it sits above the oil level in the sump

 

however....

 

i then had the idea of using the hole in the block where currently the oil level sensor goes. This is redundant on my mi16 as there is no guage in the 205 instrument clucter so my thought is to get a suitable threaded pipe, screw that into the hole and then have the return pipe attach to that.

 

Anyone see a problem with doing it this way?

 

EDIT: Oh and an additional thought does anyone know whether the oil pipes to and from the turbo need to be high pressure ones or will jubilee clipping rubber hose to metal attachments suffice? i'm not sure what sort of pressure will be being produced and at what psi specially made pipes will be required.

 

Cheers

Edited September 30, 2006 by M@tt

[M@tt 77]

i think i'll answer my own question thanks to Mr Yorke

 

Seems it has been done before on his own turbo skip

 

 

[tidypug 5 2 Cars]

nice one, i like it when a cost effective plan comes together. How's the exhaust manifold coming?

[M@tt 77]

Oops apparently his CTI uses the tube in the sump method, those pics are of someone elses

 

How's the exhaust manifold coming?

Um in my head it perfect and its finished in reality i haven't done anything about it yet.. will get onto it shortly i think. gonna be on the lookout for a 2nd hand cheap/fooked exhaust manifold to work with

Edited September 30, 2006 by M@tt

[sonofsam 5]

EDIT: Oh and an additional thought does anyone know whether the oil pipes to and from the turbo need to be high pressure ones or will jubilee clipping rubber hose to metal attachments suffice? i'm not sure what sort of pressure will be being produced and at what psi specially made pipes will be required.

 

You would hope there isnt any pressure in there otherwise it may work its way past the seals in the turbo.

 

Why not just start with an XU10 T. bottom end, then all that will be there and you'll get decent pistons to boot

[Henry Yorke 269 3 Cars]

The oil return to the back of the block method:

 

I went for a return to sump method:

 

This is like the Turbo Technics Sump:

 

The whole thing with turbo oil retuns is that they need to be totally unrestrictive as the oil needs to fall back into the sump easily. Any pressure build up here will blow the turbo oil seals. Also the oil fed to the turbo does not need to be high pressure as this can add to the problem and take the high pressure away from the rest of the engine system, where it is needed more. I have known of turbo's blowing their seals due to a kinked return pipe and also the oil needs to enter the sump from above the oil level otherwise it is having to work to return.

 

The block entry method above is what is on Gerben's car. The downside to this is it is another fancy pipe and it has quite a few kinks in it so probably not the most efficient way to the sump. I wondered why Turbo Technics didn't use it if it was so easy as it would have saved them having to remove the sump.

 

The other question of where to take the oil feed from is quite easy and that is the oil pressure sensor switch on the front of the engine. Gerben used an adjustable pressure regulator on this and a pressure gauge for accuracy (not sure what pressure a turbo should receive?). Mine has a reducer in the pipe to stem the oil pressure to the turbo. Overall my oil pressure is slightly lower than halfway when running and it has had new shells in. I bought and was going to fit a group A oil pump spring, but Turbo Technics advised to run lower pressure so I left this out when refitting the sump. If I was doing it again, I think I would refit it and put a regulator into the turbo pipe to adjust the pressure to the turbo and keep the rest of the engine high.

 

2.0 Turbo bottom end. Yes you get piston spray bars etc, but for a low pressure turbo application it should be fine with the Mi16 bottom end. For more boost, you would have to lower the compression ratio more and this should ideally be done via lower comrpession forged pistons. Cheaper is to use 2.0 T pistons or cheapest still is 2 head gaskets / spacer plate. Obviously you get what you pay for, and reliability comes at a price associated to the level of engineering required.

Edited September 30, 2006 by Henry Yorke

[Miles 331 1 Cars]

The 2l bottom end uses the same type of return in the block and the take off is in the main oil gallery or where the low oil pressure switch sit's on the S16, The drive to the oil pump is the smallest drive wheel I;ve seen to date but the engine still gives good pressure

For the feed into the turbo I would use proper fittings as it is under pressure but the drains OK to use normal clips, But personally I would still use fitting's

[M3Evo 0]

I quite like the idea of using that tapping in the block as long as there's enough fall on the drain pipe.

 

Having said that, there's about 2" if that of fall for the oil drain on my front turbo and it seems to be alright.

 

If you do find that there's not enough of a drop and want an easy mod for the sump, you can buy little bolt on turbo drains from a Landy Freelander which just require you to drill 3 holes in the sump and bolt it on

 

EDIT> Ah HA!

 

Found a piccy and everything!

 

 

Probably a 20minute job to fit those and doesn't require any welding

 

Can dig out the part number if anyone needs it.

Edited October 1, 2006 by M3Evo

[TEKNOPUG 3]

I wondered why Turbo Technics didn't use it if it was so easy as it would have saved them having to remove the sump.

 

The sump was removed anyway to fit the baffle, so I guess it made little difference. Interestingly (or perhaps not), I have no idea what Xu engine the sump comes from, iof indeed it dies at all. I've tried 8 different sump plugs from Main dealers, motor factors etc and none of them have fitted. I even have to get a compression washer from one of the Renault range as that's the only one which fits.