forced induction Turbo Fuel Return Question

[PetrolJunky]

Hello,

 

I see that you need to drill a hole in the oil pan, I would rather not, simply because it looks like a pain in the butt.

 

Would it be a bad idea to just plumb it into the oil drain plug?

 

The only reason I am not doing it without asking is because, I am not sure if the presure from the oil matters, and I am not sure if there is a risk of bumping it on speedbumps/etc

 

Thanks,

Matt

[M3M3]

why are you putting fuel in the oil pan?

[jgerock]

why are you putting fuel in the oil pan?

Thread subject needs a slight modification...

 

Oil return line from turbo..

[PetrolJunky]

Haha, Sorry, oil return from the turbo.

 

I also see people putting it back in the valve cover, that sounds much easier.

Haha, Sorry, oil return from the turbo.

 

I also see people putting it back in the valve cover, that sounds much easier.

[TobyB]

You need to return oil BELOW the turbo bearings but ABOVE the oil level in the pan.

Otherwise, your turbo will ingest gobs of oil.  Apparently, the oil that comes out is

aerated something ferocious, and won't do anything but float on top of the oil in your pan.

 

You're right, it's a pain in the butt, and some do it with an electric scavenge pump because

THAT is easier than anything else.

 

On the B20, I returned it to the lowest corner of the timing chain case, and that works on the M10/M30 as well.

 

On the M20, yes, the top of the oil pan is probably about all you can do.  Or the very bottom of the block.

You have to be careful, though, as windage can plug it with predictable results.

 

Corky Bell wrote a great book on turbocharging- every time I didn't do what he said to do, I got to do it over again.

 

hth

 

t

[PetrolJunky]

Thank you Toby,

I will start unscrewing the oil pan now.

Matt

[Rocan]

See mine:
AN-12 bung fitted to the front center of the oil pan, between the bolts that hold it on. Same way that BMW did it from the factory.

 

 

 

 

 

 

 

Factory car:

 

Another angle:

 

Edited November 19, 2013 by Rocan

[Original_Customs]

The oil return doesn't need to be above the oil level, as long as the turbo is higher than the oil level by more than just a little.  I decided to risk it when I built my turbo 914 and I haven't had a problem.  The oil return for the turbo is tied in at literally the lowest point in the engine.  Oh, and you need a sufficiently large return.  Mine is AN-10.