Scavenger catch tank

[SBK930]

I have noticed many here have deleted the stock drip tank from the turbo is there a main reason why and any thoughts on this item from eBay being suitable ?
It also has a breather (AN12) so that it could be plumbed into the stock air cleaner box and the inlet and outlet (AN10)

[Rawknees'Turbo]

The only reason that the stock turbo drip tank is replaced with an aftermarket one is that often when a non-stock turbocharger an/or aftermarket headers are used, the stock tank no longer fits at all - no performance advantage of any kind is gained.

[SBK930]

Originally Posted by Rawknees'Turbo

The only reason that the stock turbo drip tank is replaced with an aftermarket one is that often when a non-stock turbocharger an/or aftermarket headers are used, the stock tank no longer fits at all - no performance advantage of any kind is gained.

[Rawknees'Turbo]

[SBK930]

Originally Posted by Rawknees'Turbo

Jigglin haemeroids!!!

Or wired ass twerk???

[Rawknees'Turbo]

^^^

Yep - that's a new dance that Kevin invented; jiggling hemorrhoids twerk!

[baloo]

Originally Posted by SBK930

I have noticed many here have deleted the stock drip tank from the turbo is there a main reason why and any thoughts on this item from eBay being suitable ?

I know this has been answered before, but in the interest of time, is a catch can really necessary?
Advantages/disadvantages?

I know in my aftermarket setup, the catch can would sit pretty low.
Also, if using gravity drain to the oil sump, it adds a layer of plumbing that makes it difficult to get sufficient downward angle for the final approach to the sump -- using gravity drainage. (I have an electric TurboWerx oil pump planned, but have the usual concerns about electrical failure, thus want gravity drainage to also be operational.)

[boosted79]

Not necessary for a gravity drain.

[16Volt]

Originally Posted by boosted79

Not necessary for a gravity drain.

Really? Deleting my drip tank would solve a bunch of fitment issues for me.

[Rawknees'Turbo]

Originally Posted by 16Volt

Really? Deleting my drip tank would solve a bunch of fitment issues for me.

Would also mean deleting the scavange pump and draining oil directly from the turbocharger into a spot on the engine that sits much lower than it does.

[Rawknees'Turbo]

Originally Posted by baloo

I know this has been answered before, but in the interest of time, is a catch can really necessary?
Advantages/disadvantages?

I know in my aftermarket setup, the catch can would sit pretty low.
Also, if using gravity drain to the oil sump, it adds a layer of plumbing that makes it difficult to get sufficient downward angle for the final approach to the sump -- using gravity drainage. (I have an electric TurboWerx oil pump planned, but have the usual concerns about electrical failure, thus want gravity drainage to also be operational.)

The drip tank allows oil that is in the turbo bearing cartridge, and in the oil supply pipe/hose ahead of it, someplace to go after engine shutdown, otherwise it can just sit in the bearing cartridge and coke up. Most cars and trucks don't use a drip tank because the turbo sits much higher up in the engine bay that the 930's does and simply drain out of the oil supply exit hose and into wherever the return oil goes (such as the oil pan).

[16Volt]

Originally Posted by Rawknees'Turbo

Would also mean deleting the scavange pump and draining oil directly from the turbocharger into a spot on the engine that sits much lower than it does.

Ahh - got it. Good to know.

[TurboKraft]

Originally Posted by Rawknees'Turbo

The drip tank allows oil that is in the turbo bearing cartridge, and in the oil supply pipe/hose ahead of it, someplace to go after engine shutdown, otherwise it can just sit in the bearing cartridge and coke up. Most cars and trucks don't use a drip tank because the turbo sits much higher up in the engine bay that the 930's does and simply drain out of the oil supply exit hose and into wherever the return oil goes (such as the oil pan).

Plus the oil in the turbocharger oil supply line, and the oil capacity that still flows out of the crankcase after shutoff as pressure bleeds down...

Kudos to you if you can get such a low-mounted turbo to successfully gravity drain back into the engine sans pump. Where are you going to run it to?

[baloo]

Originally Posted by TurboKraft

Kudos to you if you can get such a low-mounted turbo to successfully gravity drain back into the engine sans pump. Where are you going to run it to?

You bring up my worry!
For those who are planning 3.2 Turbo conversions, with drainage to the crankcase bottom plate, and recognizing that there is very little vertical distance for gravity drainage....
WHAT IF you use a TurboWerx oil pump (for instance) to assist drainage from the turbo...
AND, WHAT IF the pump fails (as has been noted quite a few times over the years that I have been following this forum),
will the oil continue to drain THRU the oil pump gears?

Probably not, especially since the pump usually sits rather high in the line of downward drainage from the turbo.

SO, what do you think about using a "Y" connector on the turbo drainage, such that the pump will pump the oil, while the gravity drainage to the bottom of the crankcase will be also open.
Will that oil pump burn out due to inadequate oil supply?

Is this too much thinkin'?
Is this the typical Academic masturbation that we find in Congress?
Or, is it a fair consideration?
Thanks for your expert opinion.

[TurboKraft]

Drain to the bottom of the case sounds like the worst idea IMO. An oil fitting sticking down off the lowest point of the engine... Nope, certainly not in harm's way on a street car...

Electric scavenge pumps are one solution, no mods to the camshaft. Done it before many times, including a 964 we recently turbocharged with a bolt-on system.

Mechanical pumps are great, simple and reliable, and adding a good used OEM Turbo pump is pretty easy. The aftermarket "billet" pump requires pulling the cam and adding a pump drive like a factory Turbo cam.

[RarlyL8]

This is our sump tank. The vent line actually came in handy when the stock 3LDZ bit the dust at 70,000 miles. Puked oil back into the air cleaner along with hot steam from the turbo. Not sure where all the pressure would have gone without it, probably in the oil system and all over the back of the car.

[SBK930]

I had this mounted in line from the oil cooler to the oil tank for extra cooling, however deleted it because the oil leaks gave me the shoits.
I do like the look of Brian's tank and wonder if it could be improved with a finned alloy tank like the extra cooler I have as the tank sits close to the exhaust.




Also does anyone know what the deleted threaded hole is for that is positioned next to the return line from the scavenge pump .

[TurboKraft]

That inline cooler between the tank and oil cooler is ineffective. Don't bother.
Finned oil drain can? That may help, marginally.
If you want to be sure not to overheat, make sure your thermostats are working correctly, opening completely, and your oil cooler is clean and clear of road debris.

[TurboKraft]

The capped fitting on the tank is the oil return from the AOS (air-oil separator).

[SBK930]

Originally Posted by TurboKraft

The capped fitting on the tank is the oil return from the AOS (air-oil separator).

Hi Chris,
What and where was the air - oil separator and did my 78 have one as this is not the original oil tank, I replaced it some years ago as the original was leaking from the seams.
Thanks Steve.