Turbo Conversion - Oil Return/Supply

[sigchuck]

Hi gents, I was wondering what you all might think are good supply and return locations for turbo oil on an SC conversion. I see no reason to deviate from the 930 design on the supply and gather it from the plate the breather ties into, but I wasn't sure about the return. I do plan to use an electric scavenge pump, so gravity feed isn't really a concern. I considered returning back into the breather plate as well, but would that hot oil be supplied back to the turbo, or am I overthinking things?

Thanks for your thoughts!

[1979-930]

https://forums.pelicanparts.com/911-930-turbo-super-charging-forum/964984-oil-drain-plug-return-turbo.html

https://forums.pelicanparts.com/911-930-turbo-super-charging-forum/834524-turbo-oil-return-suggestions-please.html

I think the drain plug adapters are the best idea. The electric pump is just more work and cost than necessary.

[sigchuck]

Thanks! I've definitely looked at that solution, but short of the JWE sump plate (which I don't think is available anymore), it seemed like there was a risk of scraping the sump and knocking the drain off. I'm also wondering whether the turbo would sit higher with a stock exhaust system or aftermarket headers. If there's enough gravity, I think I would give it a try, but reviews seemed mixed.

['76 911S 3.0]

Feed using a tee where the idiot light switch resides, drain back to the breather cover like this (if planning on using an electric scavenge pump):



You can see how I feed mine here:

[flat6pilot]

Using the existing drain plug is possible as a return location. No need for a pump.

I found someone that made a custom drain cover from the forums here.

Another 911sc Turbo Conversion

[quattrorunner]

Originally Posted by '76 911S 3.0

Feed using a tee where the idiot light switch resides, drain back to the breather cover like this (if planning on using an electric scavenge pump):



You can see how I feed mine here:

Same here, works great

[flat6pilot]

TurboKraft sells the 930 turbo supply hoses so you can set it up like the 930 stock location.

[sigchuck]

Thanks, guys! What is the factory feed location for the 930? I know it’s on the top of the case, and I always assumed it was the breather cover, but is it tee’d off the oil pressure switch like the BAE kits?

Based on the price of the banjo bolt I can run to my sump plate (I must have an early 83), I think it would make sense to at least try a gravity drain first. Has anyone installed a check valve to prevent oil from backflowing into the turbo if the car sits? It looks like summit/jegs/etc sell plenty of different AN threaded valves. Any reason not to put one in drain line?

[quattrorunner]

feed pressure comes from the pressure switch area.
https://parts.turbokraft.com/collections/911/products/turbocharger-oil-feed-line-set-3k-warner
You can easily try the drain into...whatever you wanna try but keep your mind open to getting a pump and running back to the tank or better yet the breather cover.

[sigchuck]

Great, thank you.

I'll definitely keep an open mind. A scavenge pump was a foregone conclusion until I started reading this thread and others. For the cost of a $50 fitting and some AN line, it seems like draining to the sump is worth a try though.

I'd ideally not like to sit and wait for the car to cool down after an on boost run though. Is coking still a concern with modern synthetics changed at regular intervals? This is one area that JWE and other race teams may not have been too concerned with considering what I'm assuming is a relatively short life expectancy on a race engine/turbocharger (a complete assumption on my part).

[quattrorunner]

Synthetic oil has changed a lot of this issue but it'll coke too(needs to be lots hotter though).

[Drbraunsr]

Ha ! - the colored balloons are a clever idea. The only drawback for me is, I can imagine my grandkids taking them off and using them for water balloons.

Good idea BTW

[YODA MASTER]

Originally Posted by '76 911S 3.0

Feed using a tee where the idiot light switch resides, drain back to the breather cover like this (if planning on using an electric scavenge pump):



You can see how I feed mine here:

It's Perfect