ngoldrich

Just noticed I was at 999 posts - so I had to do one stupid one to get to 1000 LOL

Norm

nathanUK '81 930 G50

Jonathan, you won't be running 6mm of oil to your turbo as there is a restriction in the hollow bolt where the banjo connects. Not sure how big this hole is but it smaller than 6mm. Of course it is bigger than 0.060" though too.

I would be interested to know how your turbo jacket is cooled though without an additional pump. I haven't seen any pics of this being done and have wondered how it could be done.

ngoldrich

i 'Y'd off from the -3 oil feed line one goes to the bearings and one goes to the cooling jacket.

That was what the Garret engineers recommended to me.

So the 75-80 psi of engine oil pressure forces it throught the jacket.

Norm

Kevin

You have to remember that the flip side is.. If you remove the cooling even with the oil restriction what would the lifespan be.. I think it has to be a combination of both solutions. Bottom line if you are missing either solution your lifespan will decrease greatly.

JBL930

Norman, my car has no real gizmos, no EFI, no knock sensing, no EGT sensing, no flux capacitor, i don't even have a wide band AFR guage which i know is probably a bit stupid, especially when i'm running a 7th injector! I don't want to start a debate on the crudeness of the 7th injector BTW. I was only just going lean right at the top of the rev range so this was added as a little bit of a safety net, it is however making the car run very rich, low 11's at WOT and as bad as low 10's between 3000 and 4500rpms. Anyway, i was wondering if you can tell if my turbo is having oil fed to the jacket from the pics, they are old pics i found when the engine was going in

ngoldrich

JBL - no worries in the gizmos..

It looks like from your pics you have a 'T' fitting too that feeds the bearing as well as your cooling jacket. I see both supply lines. Where does the cooling jacket return line dump the oil? I cannot see that.

btw - rujnning that rich most likely your exhaust temps are reasonable just so your boost level and ignition advance is reasonable too...

Norm - yes Norm not Norman LOL

ngoldrich

JBL - btw I goto London a lot. I was overseas 4 months last year - every qtr to Berlin, Frankfurt, London, Partis, Edinburgh, Melbourne Aus...

JBL930

Sorry for getting your name wrong Norm, no offense intended. I have only one old pic under the car, not sure it shows much though



I'm still on the stock waste gate with a 1.0bar spring which holds around 0.9bar at WOT, not sure what the ignition is set at but i believe it's the stock setting. Do you do all that travelling for racing? If so you'll have to give us UK chaps a heads up when you're over next and we'll come and cheer you on!

Kevin, with things the way they are does it still sound like i could be turning the thing into a turbine jet engine? Or would it need to be WAY richer to get secondary combustion? I'm just trying to understand what has/could have happened, cheers

ngoldrich

I go for business and fun. I run at the Nurburgring fairly often which is a blast. Makes the travel more fun.

btw - you didnt reply as to where the turbo jacket oil return line is plumbed. Fromt he pics it hould be the line on the inner side (facing the engine) of the center section.

JBL930

I have no idea Norm, the car is in the shop so i can't take a look, where does the line off the bottom of the drip tank go, and should the return for the jacket go to the same place?

I've yet to go to the ring, i go to Le Mans every year and always mean to go up to the ring afterwards but i'm always too busy, i'll get out there one day

ngoldrich

The one line I see on your turbo drip accumulator tank looks like it goes as expected to your turbo scavenge pump which is mounted to the back of cyl1-3 cam...

Norm

JBL930

So where do you think my jacket return line will go? Is there more than one place that it can get hooked up too? I'm assuming that it would need to be somewhere in the circuit where it will get sent in the general direction of the front oil cooler and have a good amount of flow to move lots of oil through the jacket. I think it's apparent that I know very little about these engines, I’m just trying to think logically, it's a good job I don't go near it with a spanner it would end up no more use than an ornament!

Kevin

From your pictures, it looks like you do have a oil restrictor and "NO" jacket cooling..

ngoldrich

Hard to tell from the pics - but it looks to me like :

(1) the oil feed line for bearings is going to the top
(2) The oil exit is at the bottom to the drip accumulator
(3) The oil jacket cooling suppy is outside left - using a 14mm adapter to AN fitting
(4) The oil jacket cooling return we cannot see.

Norm

Kevin

Norm, I can't see the 12 o'clock oil inlet. It looks like the supply was rotated?